diff --git a/.mocharc.coverage.js b/.mocharc.coverage.js
deleted file mode 100644
index 91c93518ca..0000000000
--- a/.mocharc.coverage.js
+++ /dev/null
@@ -1,10 +0,0 @@
-module.exports = Object.assign(
-	{},
-	require('./mocharc.js'),
-	{
-		fullTrace: true,
-		require: [
-			'source-map-support/register'
-		]
-	}
-);
diff --git a/.mocharc.js b/.mocharc.js
index 6159fd937f..de41cdd353 100644
--- a/.mocharc.js
+++ b/.mocharc.js
@@ -3,3 +3,13 @@ module.exports = {
 		'test/test.js'
 	]
 };
+
+// add coverage options when running 'npx c8 mocha'
+if (process.env.NODE_V8_COVERAGE) {
+	Object.assign(module.exports, {
+		fullTrace: true,
+		require: [
+			'source-map-support/register'
+		]
+	});
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21a9441c41..2734f9dcc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,29 @@
 # Svelte changelog
 
+## 3.27.0
+
+* Add `|nonpassive` event modifier, explicitly passing `passive: false` ([#2068](https://github.com/sveltejs/svelte/issues/2068))
+* Scope CSS selectors with `~` and `+` combinators ([#3104](https://github.com/sveltejs/svelte/issues/3104))
+* Fix keyed `{#each}` not reacting to key changing ([#5444](https://github.com/sveltejs/svelte/issues/5444))
+* Fix destructuring into store values ([#5449](https://github.com/sveltejs/svelte/issues/5449))
+* Fix erroneous `missing-declaration` warning with `use:obj.method` ([#5451](https://github.com/sveltejs/svelte/issues/5451))
+
+## 3.26.0
+
+* Support `use:obj.method` as actions ([#3935](https://github.com/sveltejs/svelte/issues/3935))
+* Support `_` as numeric separator ([#5407](https://github.com/sveltejs/svelte/issues/5407))
+* Fix assignments to properties on store values ([#5412](https://github.com/sveltejs/svelte/issues/5412))
+* Add special style scoping handling of `[open]` selectors on `<details>` elements ([#5421](https://github.com/sveltejs/svelte/issues/5421))
+* Support `import.meta` in template expressions ([#5422](https://github.com/sveltejs/svelte/issues/5422))
+
+## 3.25.1
+
+* Fix specificity of certain styles involving a child selector ([#4795](https://github.com/sveltejs/svelte/issues/4795))
+* Fix transitions that are parameterised with stores ([#5244](https://github.com/sveltejs/svelte/issues/5244))
+* Fix scoping of styles involving child selector and `*` ([#5370](https://github.com/sveltejs/svelte/issues/5370))
+* Fix destructuring which reassigns stores ([#5388](https://github.com/sveltejs/svelte/issues/5388))
+* Fix `{#await}`s with no `{:catch}` getting stuck unresolved if the promise rejects ([#5401](https://github.com/sveltejs/svelte/issues/5401))
+
 ## 3.25.0
 
 * Use `null` rather than `undefined` for coerced bound value of `<input type="number">` ([#1701](https://github.com/sveltejs/svelte/issues/1701))
diff --git a/package-lock.json b/package-lock.json
index 34189b3f63..3ddddec683 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.25.0",
+  "version": "3.27.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -315,9 +315,9 @@
       "dev": true
     },
     "acorn": {
-      "version": "7.3.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
-      "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.0.tgz",
+      "integrity": "sha512-+G7P8jJmCHr+S+cLfQxygbWhXy+8YTVGzAkpEbcLo2mLoL7tij/VG41QSHACSf5QgYRhMZYHuNc6drJaO0Da+w==",
       "dev": true
     },
     "acorn-globals": {
diff --git a/package.json b/package.json
index 59f35dfa80..62b15efb5f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.25.0",
+  "version": "3.27.0",
   "description": "Cybernetically enhanced web apps",
   "module": "index.mjs",
   "main": "index",
@@ -23,10 +23,10 @@
   },
   "types": "types/runtime/index.d.ts",
   "scripts": {
-    "test": "mocha --config .mocharc.js",
+    "test": "mocha",
     "test:unit": "mocha --require sucrase/register --recursive src/**/__test__.ts",
-    "quicktest": "mocha --config .mocharc.js",
-    "precoverage": "c8 mocha --config .mocharc.coverage.js",
+    "quicktest": "mocha",
+    "precoverage": "c8 mocha",
     "coverage": "c8 report --reporter=text-lcov > coverage.lcov && c8 report --reporter=html",
     "codecov": "codecov",
     "precodecov": "npm run coverage",
@@ -68,7 +68,7 @@
     "@types/node": "^8.10.53",
     "@typescript-eslint/eslint-plugin": "^3.0.2",
     "@typescript-eslint/parser": "^3.0.2",
-    "acorn": "^7.3.1",
+    "acorn": "^7.4.0",
     "agadoo": "^1.1.0",
     "c8": "^5.0.1",
     "code-red": "^0.1.3",
diff --git a/site/content/blog/2019-04-15-setting-up-your-editor.md b/site/content/blog/2019-04-15-setting-up-your-editor.md
index b80223d820..fb8287d0cb 100644
--- a/site/content/blog/2019-04-15-setting-up-your-editor.md
+++ b/site/content/blog/2019-04-15-setting-up-your-editor.md
@@ -30,7 +30,9 @@ To treat `*.svelte` files as HTML, open *__Edit → Config...__* and add the fol
 
 ## Vim/Neovim
 
-To treat all `*.svelte` files as HTML, add the following line to your `init.vim`:
+You can use the [coc-svelte extension](https://github.com/coc-extensions/coc-svelte) which utilises the official language-server.
+
+As an alternative you can treat all `*.svelte` files as HTML. Add the following line to your `init.vim`:
 
 ```
 au! BufNewFile,BufRead *.svelte set ft=html
@@ -50,13 +52,7 @@ To set the filetype for a single file, use a [modeline](https://vim.fandom.com/w
 
 ## Visual Studio Code
 
-To treat `*.svelte` files as HTML, add the following lines to your `settings.json` file:
-
-```cson
-  "files.associations": {
-    "*.svelte": "html"
-  }
-```
+We recommend using the official [Svelte for VS Code extension](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode).
 
 ## JetBrains WebStorm
 
diff --git a/site/content/docs/02-template-syntax.md b/site/content/docs/02-template-syntax.md
index 74beaa2358..10e59e8a1f 100644
--- a/site/content/docs/02-template-syntax.md
+++ b/site/content/docs/02-template-syntax.md
@@ -496,6 +496,7 @@ The following modifiers are available:
 * `preventDefault` — calls `event.preventDefault()` before running the handler
 * `stopPropagation` — calls `event.stopPropagation()`, preventing the event reaching the next element
 * `passive` — improves scrolling performance on touch/wheel events (Svelte will add it automatically where it's safe to do so)
+* `nonpassive` — explicitly set `passive: false`
 * `capture` — fires the handler during the *capture* phase instead of the *bubbling* phase
 * `once` — remove the handler after the first time it runs
 * `self` — only trigger handler if event.target is the element itself
diff --git a/site/content/faq/200-are-there-any-video-courses.md b/site/content/faq/200-are-there-any-video-courses.md
index 1a70cdfcf5..97e0e9d808 100644
--- a/site/content/faq/200-are-there-any-video-courses.md
+++ b/site/content/faq/200-are-there-any-video-courses.md
@@ -6,9 +6,9 @@ Rich Harris, the creator of Svelte, taught a course:
 
 - [Frontend Masters](https://frontendmasters.com/courses/svelte/)
 
-There are also a couple of third-party courses:
+There are also a number of third-party courses:
 
-- [Egghead](https://egghead.io/playlists/getting-started-with-svelte-3-05a8541a)
-- [Udemy](https://www.udemy.com/sveltejs-the-complete-guide/)
+- [Egghead](https://egghead.io/browse/frameworks/svelte)
+- [Udemy](https://www.udemy.com/courses/search/?q=sveltejs+svelte)
 
 Note that Udemy very frequently has discounts over 90%.
diff --git a/site/content/faq/250-are-there-any-books.md b/site/content/faq/250-are-there-any-books.md
new file mode 100644
index 0000000000..80870428ec
--- /dev/null
+++ b/site/content/faq/250-are-there-any-books.md
@@ -0,0 +1,9 @@
+---
+question: Are there any books?
+---
+
+There are a few books:
+
+- [Svelte Handbook](https://flaviocopes.com/page/download-svelte-handbook/) by Flavio Copes
+- [Svelte 3 Up and Running](https://www.amazon.com/dp/B08D6T6BKS/) by Alessandro Segala
+- [Svelte and Sapper in Action](https://www.manning.com/books/svelte-and-sapper-in-action) by R. Mark Volkmann
diff --git a/site/content/tutorial/01-introduction/07-making-an-app/text.md b/site/content/tutorial/01-introduction/07-making-an-app/text.md
index 4d044272b5..d75a9a626c 100644
--- a/site/content/tutorial/01-introduction/07-making-an-app/text.md
+++ b/site/content/tutorial/01-introduction/07-making-an-app/text.md
@@ -13,7 +13,7 @@ First, you'll need to integrate Svelte with a build tool. There are officially m
 
 Don't worry if you're relatively new to web development and haven't used these tools before. We've prepared a simple step-by-step guide, [Svelte for new developers](blog/svelte-for-new-developers), which walks you through the process.
 
-You'll also want to configure your text editor to treat `.svelte` files the same as `.html` for the sake of syntax highlighting. [Read this guide to learn how](blog/setting-up-your-editor).
+You'll also want to configure your text editor. If you're using VS Code, install the [Svelte extension](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode), otherwise follow [this guide](blog/setting-up-your-editor) to configure your text editor to treat `.svelte` files the same as `.html` for the sake of syntax highlighting.
 
 Then, once you've got your project set up, using Svelte components is easy. The compiler turns each component into a regular JavaScript class — just import it and instantiate with `new`:
 
diff --git a/site/content/tutorial/05-events/03-event-modifiers/text.md b/site/content/tutorial/05-events/03-event-modifiers/text.md
index 41154cafcd..2b2d6e6b31 100644
--- a/site/content/tutorial/05-events/03-event-modifiers/text.md
+++ b/site/content/tutorial/05-events/03-event-modifiers/text.md
@@ -21,6 +21,7 @@ The full list of modifiers:
 * `preventDefault` — calls `event.preventDefault()` before running the handler. Useful for client-side form handling, for example.
 * `stopPropagation` — calls `event.stopPropagation()`, preventing the event reaching the next element
 * `passive` — improves scrolling performance on touch/wheel events (Svelte will add it automatically where it's safe to do so)
+* `nonpassive` — explicitly set `passive: false`
 * `capture` — fires the handler during the *capture* phase instead of the *bubbling* phase ([MDN docs](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Building_blocks/Events#Event_bubbling_and_capture))
 * `once` — remove the handler after the first time it runs
 * `self` — only trigger handler if event.target is the element itself
diff --git a/site/src/routes/_layout.svelte b/site/src/routes/_layout.svelte
index 07445de0a0..55f4861880 100644
--- a/site/src/routes/_layout.svelte
+++ b/site/src/routes/_layout.svelte
@@ -62,7 +62,6 @@
 
 <style>
 	main {
-		height: 100%;
 		position: relative;
 		margin: 0 auto;
 		/* padding: var(--nav-h) var(--side-nav) 0 var(--side-nav); */
diff --git a/site/src/routes/repl/[id]/index.svelte b/site/src/routes/repl/[id]/index.svelte
index 59ca292adb..945678ba33 100644
--- a/site/src/routes/repl/[id]/index.svelte
+++ b/site/src/routes/repl/[id]/index.svelte
@@ -117,7 +117,7 @@
 <style>
 	.repl-outer {
 		position: relative;
-		height: 100%;
+		height: calc(100vh - var(--nav-h));
 		--app-controls-h: 5.6rem;
 		--pane-controls-h: 4.2rem;
 		overflow: hidden;
diff --git a/src/compiler/compile/Component.ts b/src/compiler/compile/Component.ts
index ed2b10e404..6c1fe89823 100644
--- a/src/compiler/compile/Component.ts
+++ b/src/compiler/compile/Component.ts
@@ -29,6 +29,7 @@ import add_to_set from './utils/add_to_set';
 import check_graph_for_cycles from './utils/check_graph_for_cycles';
 import { print, x, b } from 'code-red';
 import { is_reserved_keyword } from './utils/reserved_keywords';
+import Element from './nodes/Element';
 
 interface ComponentOptions {
 	namespace?: string;
@@ -85,6 +86,7 @@ export default class Component {
 	file: string;
 	locate: (c: number) => { line: number; column: number };
 
+	elements: Element[] = [];
 	stylesheet: Stylesheet;
 
 	aliases: Map<string, Identifier> = new Map();
@@ -171,8 +173,8 @@ export default class Component {
 
 		this.walk_instance_js_post_template();
 
+		this.elements.forEach(element => this.stylesheet.apply(element));
 		if (!compile_options.customElement) this.stylesheet.reify();
-
 		this.stylesheet.warn_on_unused_selectors(this);
 	}
 
@@ -221,6 +223,10 @@ export default class Component {
 		return this.aliases.get(name);
 	}
 
+	apply_stylesheet(element: Element) {
+		this.elements.push(element);
+	}
+
 	global(name: string) {
 		const alias = this.alias(name);
 		this.globals.set(name, alias);
@@ -947,12 +953,6 @@ export default class Component {
 							const variable = component.var_lookup.get(name);
 
 							if (variable.export_name && variable.writable) {
-								const insert = variable.subscribable
-									? get_insert(variable)
-									: null;
-
-								parent[key].splice(index + 1, 0, insert);
-
 								declarator.id = {
 									type: 'ObjectPattern',
 									properties: [{
@@ -973,7 +973,9 @@ export default class Component {
 								};
 
 								declarator.init = x`$$props`;
-							} else if (variable.subscribable) {
+							}
+
+							if (variable.subscribable && declarator.init) {
 								const insert = get_insert(variable);
 								parent[key].splice(index + 1, 0, ...insert);
 							}
diff --git a/src/compiler/compile/css/Selector.ts b/src/compiler/compile/css/Selector.ts
index 6bc046c93e..c141f6b481 100644
--- a/src/compiler/compile/css/Selector.ts
+++ b/src/compiler/compile/css/Selector.ts
@@ -4,12 +4,24 @@ import { gather_possible_values, UNKNOWN } from './gather_possible_values';
 import { CssNode } from './interfaces';
 import Component from '../Component';
 import Element from '../nodes/Element';
+import { INode } from '../nodes/interfaces';
+import EachBlock from '../nodes/EachBlock';
+import IfBlock from '../nodes/IfBlock';
+import AwaitBlock from '../nodes/AwaitBlock';
 
 enum BlockAppliesToNode {
 	NotPossible,
 	Possible,
 	UnknownSelectorType
 }
+enum NodeExist {
+	Probably = 1,
+	Definitely = 2,
+}
+
+const whitelist_attribute_selector = new Map([
+	['details', new Set(['open'])]
+]);
 
 export default class Selector {
 	node: CssNode;
@@ -35,10 +47,10 @@ export default class Selector {
 		this.used = this.local_blocks.length === 0;
 	}
 
-	apply(node: Element, stack: Element[]) {
+	apply(node: Element) {
 		const to_encapsulate: any[] = [];
 
-		apply_selector(this.local_blocks.slice(), node, stack.slice(), to_encapsulate);
+		apply_selector(this.local_blocks.slice(), node, to_encapsulate);
 
 		if (to_encapsulate.length > 0) {
 			to_encapsulate.forEach(({ node, block }) => {
@@ -65,9 +77,8 @@ export default class Selector {
 
 	transform(code: MagicString, attr: string, max_amount_class_specificity_increased: number) {
 		const amount_class_specificity_to_increase = max_amount_class_specificity_increased - this.blocks.filter(block => block.should_encapsulate).length;
-		attr = attr.repeat(amount_class_specificity_to_increase + 1);
 
-		function encapsulate_block(block: Block) {
+		function encapsulate_block(block: Block, attr: string) {
 			let i = block.selectors.length;
 
 			while (i--) {
@@ -89,15 +100,14 @@ export default class Selector {
 			}
 		}
 
-		this.blocks.forEach((block) => {
+		this.blocks.forEach((block, index) => {
 			if (block.global) {
 				const selector = block.selectors[0];
 				const first = selector.children[0];
 				const last = selector.children[selector.children.length - 1];
 				code.remove(selector.start, first.start).remove(last.end, selector.end);
 			}
-
-			if (block.should_encapsulate) encapsulate_block(block);
+			if (block.should_encapsulate) encapsulate_block(block, index === this.blocks.length - 1 ? attr.repeat(amount_class_specificity_to_increase + 1) : attr);
 		});
 	}
 
@@ -147,12 +157,12 @@ export default class Selector {
 	}
 }
 
-function apply_selector(blocks: Block[], node: Element, stack: Element[], to_encapsulate: any[]): boolean {
+function apply_selector(blocks: Block[], node: Element, to_encapsulate: any[]): boolean {
 	const block = blocks.pop();
 	if (!block) return false;
 
 	if (!node) {
-		return blocks.every(block => block.global);
+		return block.global && blocks.every(block => block.global);
 	}
 
 	switch (block_might_apply_to_node(block, node)) {
@@ -160,7 +170,7 @@ function apply_selector(blocks: Block[], node: Element, stack: Element[], to_enc
 			return false;
 
 		case BlockAppliesToNode.UnknownSelectorType:
-			// bail. TODO figure out what these could be
+		// bail. TODO figure out what these could be
 			to_encapsulate.push({ node, block });
 			return true;
 	}
@@ -172,9 +182,10 @@ function apply_selector(blocks: Block[], node: Element, stack: Element[], to_enc
 					continue;
 				}
 
-				for (const stack_node of stack) {
-					if (block_might_apply_to_node(ancestor_block, stack_node) !== BlockAppliesToNode.NotPossible) {
-						to_encapsulate.push({ node: stack_node, block: ancestor_block });
+				let parent = node;
+				while (parent = get_element_parent(parent)) {
+					if (block_might_apply_to_node(ancestor_block, parent) !== BlockAppliesToNode.NotPossible) {
+						to_encapsulate.push({ node: parent, block: ancestor_block });
 					}
 				}
 
@@ -191,12 +202,22 @@ function apply_selector(blocks: Block[], node: Element, stack: Element[], to_enc
 
 			return false;
 		} else if (block.combinator.name === '>') {
-			if (apply_selector(blocks, stack.pop(), stack, to_encapsulate)) {
+			if (apply_selector(blocks, get_element_parent(node), to_encapsulate)) {
 				to_encapsulate.push({ node, block });
 				return true;
 			}
 
 			return false;
+		} else if (block.combinator.name === '+' || block.combinator.name === '~') {
+			const siblings = get_possible_element_siblings(node, block.combinator.name === '+');
+			let has_match = false;
+			for (const possible_sibling of siblings.keys()) {
+				if (apply_selector(blocks.slice(), possible_sibling, to_encapsulate)) {
+					to_encapsulate.push({ node, block });
+					has_match = true;
+				}
+			}
+			return has_match;
 		}
 
 		// TODO other combinators
@@ -208,7 +229,7 @@ function apply_selector(blocks: Block[], node: Element, stack: Element[], to_enc
 	return true;
 }
 
-function block_might_apply_to_node(block, node): BlockAppliesToNode {
+function block_might_apply_to_node(block: Block, node: Element): BlockAppliesToNode {
 	let i = block.selectors.length;
 
 	while (i--) {
@@ -234,7 +255,11 @@ function block_might_apply_to_node(block, node): BlockAppliesToNode {
 		}
 
 		else if (selector.type === 'AttributeSelector') {
-			if (!attribute_matches(node, selector.name.name, selector.value && unquote(selector.value), selector.matcher, selector.flags)) return BlockAppliesToNode.NotPossible;
+			if (
+				!(whitelist_attribute_selector.has(node.name.toLowerCase()) && whitelist_attribute_selector.get(node.name.toLowerCase()).has(selector.name.name.toLowerCase())) &&
+				!attribute_matches(node, selector.name.name, selector.value && unquote(selector.value), selector.matcher, selector.flags)) {
+				return BlockAppliesToNode.NotPossible;
+			}
 		}
 
 		else if (selector.type === 'TypeSelector') {
@@ -370,6 +395,158 @@ function unquote(value: CssNode) {
 	return str;
 }
 
+function get_element_parent(node: Element): Element | null {
+	let parent: INode = node;
+	while ((parent = parent.parent) && parent.type !== 'Element');
+	return parent as Element | null;
+}
+
+function get_possible_element_siblings(node: INode, adjacent_only: boolean): Map<Element, NodeExist> {
+	const result: Map<Element, NodeExist> = new Map();
+	let prev: INode = node;
+	while (prev = prev.prev) {
+		if (prev.type === 'Element') {
+			if (!prev.attributes.find(attr => attr.name.toLowerCase() === 'slot')) {
+				result.set(prev, NodeExist.Definitely);
+			}
+
+			if (adjacent_only) {
+				break;
+			}
+		} else if (prev.type === 'EachBlock' || prev.type === 'IfBlock' || prev.type === 'AwaitBlock') {
+			const possible_last_child = get_possible_last_child(prev, adjacent_only);
+
+			add_to_map(possible_last_child, result);
+			if (adjacent_only && has_definite_elements(possible_last_child)) {
+				return result;
+			}
+		}
+	}
+
+	if (!prev || !adjacent_only) {
+		let parent: INode = node;
+		let skip_each_for_last_child = node.type === 'ElseBlock';
+		while ((parent = parent.parent) && (parent.type === 'EachBlock' || parent.type === 'IfBlock' || parent.type === 'ElseBlock' || parent.type === 'AwaitBlock')) {
+			const possible_siblings = get_possible_element_siblings(parent, adjacent_only);
+			add_to_map(possible_siblings, result);
+			
+			if (parent.type === 'EachBlock') {
+				// first child of each block can select the last child of each block as previous sibling
+				if (skip_each_for_last_child) {
+					skip_each_for_last_child = false;
+				} else {
+					add_to_map(get_possible_last_child(parent, adjacent_only), result);
+				}
+			} else if (parent.type === 'ElseBlock') {
+				skip_each_for_last_child = true;
+				parent = parent.parent;
+			}
+
+			if (adjacent_only && has_definite_elements(possible_siblings)) {
+				break;
+			}
+		}
+	}
+
+	return result;
+}
+
+function get_possible_last_child(block: EachBlock | IfBlock | AwaitBlock, adjacent_only: boolean): Map<Element, NodeExist> {
+	const result: Map<Element, NodeExist> = new Map();
+
+	if (block.type === 'EachBlock') {
+		const each_result: Map<Element, NodeExist> = loop_child(block.children, adjacent_only);
+		const else_result: Map<Element, NodeExist> = block.else ? loop_child(block.else.children, adjacent_only) : new Map();
+		
+		const not_exhaustive = !has_definite_elements(else_result);
+
+		if (not_exhaustive) {
+			mark_as_probably(each_result);
+			mark_as_probably(else_result);
+		}
+		add_to_map(each_result, result);
+		add_to_map(else_result, result);
+	} else if (block.type === 'IfBlock') {
+		const if_result: Map<Element, NodeExist> = loop_child(block.children, adjacent_only);
+		const else_result: Map<Element, NodeExist> = block.else ? loop_child(block.else.children, adjacent_only) : new Map();
+
+		const not_exhaustive = !has_definite_elements(if_result) || !has_definite_elements(else_result);
+
+		if (not_exhaustive) {
+			mark_as_probably(if_result);
+			mark_as_probably(else_result);
+		}
+
+		add_to_map(if_result, result);
+		add_to_map(else_result, result);
+	} else if (block.type === 'AwaitBlock') {
+		const pending_result: Map<Element, NodeExist> = block.pending ? loop_child(block.pending.children, adjacent_only) : new Map();
+		const then_result: Map<Element, NodeExist> = block.then ? loop_child(block.then.children, adjacent_only) : new Map();
+		const catch_result: Map<Element, NodeExist> = block.catch ? loop_child(block.catch.children, adjacent_only) : new Map();
+
+		const not_exhaustive = !has_definite_elements(pending_result) || !has_definite_elements(then_result) || !has_definite_elements(catch_result);
+
+		if (not_exhaustive) {
+			mark_as_probably(pending_result);
+			mark_as_probably(then_result);
+			mark_as_probably(catch_result);
+		}
+
+		add_to_map(pending_result, result);
+		add_to_map(then_result, result);
+		add_to_map(catch_result, result);
+	}
+
+	return result;
+}
+
+function has_definite_elements(result: Map<Element, NodeExist>): boolean {
+	if (result.size === 0) return false;
+	for (const exist of result.values()) {
+		if (exist === NodeExist.Definitely) {
+			return true;
+		}
+	}
+	return false;
+}
+
+function add_to_map(from: Map<Element, NodeExist>, to: Map<Element, NodeExist>) {
+	from.forEach((exist, element) => {
+		to.set(element, higher_existance(exist, to.get(element)));
+	});
+}
+
+function higher_existance(exist1: NodeExist | null, exist2: NodeExist | null): NodeExist {
+	if (exist1 === undefined || exist2 === undefined) return exist1 || exist2;
+	return exist1 > exist2 ? exist1 : exist2;
+}
+
+function mark_as_probably(result: Map<Element, NodeExist>) {
+	for (const key of result.keys()) {
+		result.set(key, NodeExist.Probably);
+	}
+}
+
+function loop_child(children: INode[], adjacent_only: boolean) {
+	const result: Map<Element, NodeExist> = new Map();
+	for (let i = children.length - 1; i >= 0; i--) {
+		const child = children[i];
+		if (child.type === 'Element') {
+			result.set(child, NodeExist.Definitely);
+			if (adjacent_only) {
+				break;
+			}
+		} else if (child.type === 'EachBlock' || child.type === 'IfBlock' || child.type === 'AwaitBlock') {
+			const child_result = get_possible_last_child(child, adjacent_only);
+			add_to_map(child_result, result);
+			if (adjacent_only && has_definite_elements(child_result)) {
+				break;
+			}
+		}
+	}
+	return result;
+}
+
 class Block {
 	global: boolean;
 	combinator: CssNode;
diff --git a/src/compiler/compile/css/Stylesheet.ts b/src/compiler/compile/css/Stylesheet.ts
index 27438947ff..dc464d7df8 100644
--- a/src/compiler/compile/css/Stylesheet.ts
+++ b/src/compiler/compile/css/Stylesheet.ts
@@ -2,7 +2,7 @@ import MagicString from 'magic-string';
 import { walk } from 'estree-walker';
 import Selector from './Selector';
 import Element from '../nodes/Element';
-import { Ast, TemplateNode } from '../../interfaces';
+import { Ast } from '../../interfaces';
 import Component from '../Component';
 import { CssNode } from './interfaces';
 import hash from "../utils/hash";
@@ -51,8 +51,8 @@ class Rule {
 		this.declarations = node.block.children.map((node: CssNode) => new Declaration(node));
 	}
 
-	apply(node: Element, stack: Element[]) {
-		this.selectors.forEach(selector => selector.apply(node, stack)); // TODO move the logic in here?
+	apply(node: Element) {
+		this.selectors.forEach(selector => selector.apply(node)); // TODO move the logic in here?
 	}
 
 	is_used(dev: boolean) {
@@ -162,10 +162,10 @@ class Atrule {
 		this.declarations = [];
 	}
 
-	apply(node: Element, stack: Element[]) {
+	apply(node: Element) {
 		if (this.node.name === 'media' || this.node.name === 'supports') {
 			this.children.forEach(child => {
-				child.apply(node, stack);
+				child.apply(node);
 			});
 		}
 
@@ -364,15 +364,9 @@ export default class Stylesheet {
 	apply(node: Element) {
 		if (!this.has_styles) return;
 
-		const stack: Element[] = [];
-		let parent: TemplateNode = node;
-		while (parent = parent.parent) {
-			if (parent.type === 'Element') stack.unshift(parent as Element);
-		}
-
 		for (let i = 0; i < this.children.length; i += 1) {
 			const child = this.children[i];
-			child.apply(node, stack);
+			child.apply(node);
 		}
 	}
 
diff --git a/src/compiler/compile/nodes/Action.ts b/src/compiler/compile/nodes/Action.ts
index 86aefa0ced..dc6f080b71 100644
--- a/src/compiler/compile/nodes/Action.ts
+++ b/src/compiler/compile/nodes/Action.ts
@@ -11,10 +11,11 @@ export default class Action extends Node {
 	constructor(component: Component, parent, scope, info) {
 		super(component, parent, scope, info);
 
-		component.warn_if_undefined(info.name, info, scope);
+		const object = info.name.split('.')[0];
+		component.warn_if_undefined(object, info, scope);
 
 		this.name = info.name;
-		component.add_reference(info.name.split('.')[0]);
+		component.add_reference(object);
 
 		this.expression = info.expression
 			? new Expression(component, this, scope, info.expression)
diff --git a/src/compiler/compile/nodes/Element.ts b/src/compiler/compile/nodes/Element.ts
index 6636c6b87b..7c9272e5d3 100644
--- a/src/compiler/compile/nodes/Element.ts
+++ b/src/compiler/compile/nodes/Element.ts
@@ -16,6 +16,7 @@ import list from '../../utils/list';
 import Let from './Let';
 import TemplateScope from './shared/TemplateScope';
 import { INode } from './interfaces';
+import Component from '../Component';
 
 const svg = /^(?:altGlyph|altGlyphDef|altGlyphItem|animate|animateColor|animateMotion|animateTransform|circle|clipPath|color-profile|cursor|defs|desc|discard|ellipse|feBlend|feColorMatrix|feComponentTransfer|feComposite|feConvolveMatrix|feDiffuseLighting|feDisplacementMap|feDistantLight|feDropShadow|feFlood|feFuncA|feFuncB|feFuncG|feFuncR|feGaussianBlur|feImage|feMerge|feMergeNode|feMorphology|feOffset|fePointLight|feSpecularLighting|feSpotLight|feTile|feTurbulence|filter|font|font-face|font-face-format|font-face-name|font-face-src|font-face-uri|foreignObject|g|glyph|glyphRef|hatch|hatchpath|hkern|image|line|linearGradient|marker|mask|mesh|meshgradient|meshpatch|meshrow|metadata|missing-glyph|mpath|path|pattern|polygon|polyline|radialGradient|rect|set|solidcolor|stop|svg|switch|symbol|text|textPath|tref|tspan|unknown|use|view|vkern)$/;
 
@@ -80,6 +81,7 @@ const valid_modifiers = new Set([
 	'capture',
 	'once',
 	'passive',
+	'nonpassive',
 	'self'
 ]);
 
@@ -123,7 +125,7 @@ export default class Element extends Node {
 	namespace: string;
 	needs_manual_style_scoping: boolean;
 
-	constructor(component, parent, scope, info: any) {
+	constructor(component: Component, parent, scope, info: any) {
 		super(component, parent, scope, info);
 		this.name = info.name;
 
@@ -184,7 +186,7 @@ export default class Element extends Node {
 
 				case 'Attribute':
 				case 'Spread':
-					// special case
+				// special case
 					if (node.name === 'xmlns') this.namespace = node.value[0].data;
 
 					this.attributes.push(new Attribute(component, this, scope, node));
@@ -235,7 +237,7 @@ export default class Element extends Node {
 
 		this.validate();
 
-		component.stylesheet.apply(this);
+		component.apply_stylesheet(this);
 	}
 
 	validate() {
@@ -770,6 +772,13 @@ export default class Element extends Node {
 				});
 			}
 
+			if (handler.modifiers.has('passive') && handler.modifiers.has('nonpassive')) {
+				component.error(handler, {
+					code: 'invalid-event-modifier',
+					message: `The 'passive' and 'nonpassive' modifiers cannot be used together`
+				});
+			}
+
 			handler.modifiers.forEach(modifier => {
 				if (!valid_modifiers.has(modifier)) {
 					component.error(handler, {
@@ -804,7 +813,7 @@ export default class Element extends Node {
 				}
 			});
 
-			if (passive_events.has(handler.name) && handler.can_make_passive && !handler.modifiers.has('preventDefault')) {
+			if (passive_events.has(handler.name) && handler.can_make_passive && !handler.modifiers.has('preventDefault') && !handler.modifiers.has('nonpassive')) {
 				// touch/wheel events should be passive by default
 				handler.modifiers.add('passive');
 			}
diff --git a/src/compiler/compile/nodes/Transition.ts b/src/compiler/compile/nodes/Transition.ts
index a680fde46e..983a6ee6c7 100644
--- a/src/compiler/compile/nodes/Transition.ts
+++ b/src/compiler/compile/nodes/Transition.ts
@@ -34,7 +34,7 @@ export default class Transition extends Node {
 		}
 
 		this.expression = info.expression
-			? new Expression(component, this, scope, info.expression, true)
+			? new Expression(component, this, scope, info.expression)
 			: null;
 	}
 }
diff --git a/src/compiler/compile/nodes/shared/Expression.ts b/src/compiler/compile/nodes/shared/Expression.ts
index bbbc1b2f2d..834287bb63 100644
--- a/src/compiler/compile/nodes/shared/Expression.ts
+++ b/src/compiler/compile/nodes/shared/Expression.ts
@@ -64,6 +64,8 @@ export default class Expression {
 			enter(node: any, parent: any, key: string) {
 				// don't manipulate shorthand props twice
 				if (key === 'value' && parent.shorthand) return;
+				// don't manipulate `import.meta`, `new.target`
+				if (node.type === 'MetaProperty') return this.skip();
 
 				if (map.has(node)) {
 					scope = map.get(node);
diff --git a/src/compiler/compile/render_dom/Renderer.ts b/src/compiler/compile/render_dom/Renderer.ts
index 6fc026de23..0990281d91 100644
--- a/src/compiler/compile/render_dom/Renderer.ts
+++ b/src/compiler/compile/render_dom/Renderer.ts
@@ -166,12 +166,14 @@ export default class Renderer {
 		return member;
 	}
 
-	invalidate(name: string, value?) {
+	invalidate(name: string, value?, main_execution_context: boolean = false) {
 		const variable = this.component.var_lookup.get(name);
 		const member = this.context_lookup.get(name);
 
 		if (variable && (variable.subscribable && (variable.reassigned || variable.export_name))) {
-			return x`${`$$subscribe_${name}`}($$invalidate(${member.index}, ${value || name}))`;
+			return main_execution_context
+			  ? x`${`$$subscribe_${name}`}(${value || name})`
+			  : x`${`$$subscribe_${name}`}($$invalidate(${member.index}, ${value || name}))`;
 		}
 
 		if (name[0] === '$' && name[1] !== '$') {
diff --git a/src/compiler/compile/render_dom/invalidate.ts b/src/compiler/compile/render_dom/invalidate.ts
index 28e4f37e3f..b891b48cb5 100644
--- a/src/compiler/compile/render_dom/invalidate.ts
+++ b/src/compiler/compile/render_dom/invalidate.ts
@@ -31,48 +31,51 @@ export function invalidate(renderer: Renderer, scope: Scope, node: Node, names:
 
 	function get_invalidated(variable: Var, node?: Expression) {
 		if (main_execution_context && !variable.subscribable && variable.name[0] !== '$') {
-			return node || x`${variable.name}`;
+			return node;
 		}
-
-		return renderer.invalidate(variable.name);
+		return renderer.invalidate(variable.name, undefined, main_execution_context);
 	}
 
-	if (head) {
-		component.has_reactive_assignments = true;
-
-		if (node.type === 'AssignmentExpression' && node.operator === '=' && nodes_match(node.left, node.right) && tail.length === 0) {
-			return get_invalidated(head, node);
-		} else {
-			const is_store_value = head.name[0] === '$' && head.name[1] !== '$';
-			const extra_args = tail.map(variable => get_invalidated(variable));
-
-			const pass_value = (
-				extra_args.length > 0 ||
-				(node.type === 'AssignmentExpression' && node.left.type !== 'Identifier') ||
-				(node.type === 'UpdateExpression' && (!node.prefix || node.argument.type !== 'Identifier'))
-			);
+	if (!head) {
+		return node;
+	}
 
-			if (pass_value) {
-				extra_args.unshift({
-					type: 'Identifier',
-					name: head.name
-				});
-			}
+	component.has_reactive_assignments = true;
 
-			let invalidate = is_store_value
-				? x`@set_store_value(${head.name.slice(1)}, ${node}, ${extra_args})`
-				: !main_execution_context
-					? x`$$invalidate(${renderer.context_lookup.get(head.name).index}, ${node}, ${extra_args})`
-					: node;
+	if (node.type === 'AssignmentExpression' && node.operator === '=' && nodes_match(node.left, node.right) && tail.length === 0) {
+		return get_invalidated(head, node);
+	}
 
-			if (head.subscribable && head.reassigned) {
-				const subscribe = `$$subscribe_${head.name}`;
-				invalidate = x`${subscribe}(${invalidate})`;
-			}
+	const is_store_value = head.name[0] === '$' && head.name[1] !== '$';
+	const extra_args = tail.map(variable => get_invalidated(variable)).filter(Boolean);
 
-			return invalidate;
+	if (is_store_value) {
+		return x`@set_store_value(${head.name.slice(1)}, ${node}, ${head.name}, ${extra_args})`;
+	}
+	
+	let invalidate;
+	if (!main_execution_context) {
+		const pass_value = (
+			extra_args.length > 0 ||
+			(node.type === 'AssignmentExpression' && node.left.type !== 'Identifier') ||
+			(node.type === 'UpdateExpression' && (!node.prefix || node.argument.type !== 'Identifier'))
+		);
+		if (pass_value) {
+			extra_args.unshift({
+				type: 'Identifier',
+				name: head.name
+			});
 		}
+		invalidate = x`$$invalidate(${renderer.context_lookup.get(head.name).index}, ${node}, ${extra_args})`;
+	} else {
+		// skip `$$invalidate` if it is in the main execution context
+		invalidate = extra_args.length ? [node, ...extra_args] : node;
+	}
+
+	if (head.subscribable && head.reassigned) {
+		const subscribe = `$$subscribe_${head.name}`;
+		invalidate = x`${subscribe}(${invalidate})`;
 	}
 
-	return node;
+	return invalidate;
 }
\ No newline at end of file
diff --git a/src/compiler/compile/render_dom/wrappers/EachBlock.ts b/src/compiler/compile/render_dom/wrappers/EachBlock.ts
index 2513ea1adc..fe1c21a8df 100644
--- a/src/compiler/compile/render_dom/wrappers/EachBlock.ts
+++ b/src/compiler/compile/render_dom/wrappers/EachBlock.ts
@@ -239,6 +239,11 @@ export default class EachBlockWrapper extends Wrapper {
 		this.node.expression.dynamic_dependencies().forEach((dependency: string) => {
 			all_dependencies.add(dependency);
 		});
+		if (this.node.key) {
+			this.node.key.dynamic_dependencies().forEach((dependency: string) => {
+				all_dependencies.add(dependency);
+			});
+		}
 		this.dependencies = all_dependencies;
 
 		if (this.node.key) {
diff --git a/src/compiler/compile/render_dom/wrappers/Element/EventHandler.ts b/src/compiler/compile/render_dom/wrappers/Element/EventHandler.ts
index 157e186ea6..2fa2e9291a 100644
--- a/src/compiler/compile/render_dom/wrappers/Element/EventHandler.ts
+++ b/src/compiler/compile/render_dom/wrappers/Element/EventHandler.ts
@@ -45,11 +45,17 @@ export default class EventHandlerWrapper {
 
 		const args = [];
 
-		const opts = ['passive', 'once', 'capture'].filter(mod => this.node.modifiers.has(mod));
+		const opts = ['nonpassive', 'passive', 'once', 'capture'].filter(mod => this.node.modifiers.has(mod));
 		if (opts.length) {
-			args.push((opts.length === 1 && opts[0] === 'capture')
-				? TRUE
-				: x`{ ${opts.map(opt => p`${opt}: true`)} }`);
+			if (opts.length === 1 && opts[0] === 'capture') {
+				args.push(TRUE);
+			} else {
+				args.push(x`{ ${ opts.map(opt =>
+					opt === 'nonpassive'
+						? p`passive: false`
+						: p`${opt}: true`
+				) } }`);
+			}
 		} else if (block.renderer.options.dev) {
 			args.push(FALSE);
 		}
diff --git a/src/compiler/compile/render_dom/wrappers/Element/index.ts b/src/compiler/compile/render_dom/wrappers/Element/index.ts
index 2e35f0271f..f740560bcd 100644
--- a/src/compiler/compile/render_dom/wrappers/Element/index.ts
+++ b/src/compiler/compile/render_dom/wrappers/Element/index.ts
@@ -868,6 +868,10 @@ export default class ElementWrapper extends Wrapper {
 				block.chunks.destroy.push(b`if (detaching && ${outro_name}) ${outro_name}.end();`);
 			}
 		}
+
+		if ((intro && intro.expression && intro.expression.dependencies.size) || (outro && outro.expression && outro.expression.dependencies.size)) {
+			block.maintain_context = true;
+		}
 	}
 
 	add_animation(block: Block) {
diff --git a/src/compiler/compile/render_dom/wrappers/shared/add_actions.ts b/src/compiler/compile/render_dom/wrappers/shared/add_actions.ts
index 3d8c4fbbc0..6ca7de9a22 100644
--- a/src/compiler/compile/render_dom/wrappers/shared/add_actions.ts
+++ b/src/compiler/compile/render_dom/wrappers/shared/add_actions.ts
@@ -26,11 +26,19 @@ export function add_action(block: Block, target: string, action: Action) {
 
 	block.add_variable(id);
 
-	const fn = block.renderer.reference(action.name);
+	const [obj, ...properties] = action.name.split('.');
 
-	block.event_listeners.push(
-		x`@action_destroyer(${id} = ${fn}.call(null, ${target}, ${snippet}))`
-	);
+	const fn = block.renderer.reference(obj);
+
+	if (properties.length) {
+		block.event_listeners.push(
+			x`@action_destroyer(${id} = ${fn}.${properties.join('.')}(${target}, ${snippet}))`
+		);
+	} else {
+		block.event_listeners.push(
+			x`@action_destroyer(${id} = ${fn}.call(null, ${target}, ${snippet}))`
+		);
+	}
 
 	if (dependencies && dependencies.length > 0) {
 		let condition = x`${id} && @is_function(${id}.update)`;
diff --git a/src/compiler/parse/acorn.ts b/src/compiler/parse/acorn.ts
index d14721cdab..58031c1a1c 100644
--- a/src/compiler/parse/acorn.ts
+++ b/src/compiler/parse/acorn.ts
@@ -3,11 +3,12 @@ import * as code_red from 'code-red';
 
 export const parse = (source: string): Node => code_red.parse(source, {
 	sourceType: 'module',
-	ecmaVersion: 11,
+	ecmaVersion: 12,
 	locations: true
 });
 
 export const parse_expression_at = (source: string, index: number): Node => code_red.parseExpressionAt(source, index, {
-	ecmaVersion: 11,
+	sourceType: 'module',
+	ecmaVersion: 12,
 	locations: true
 });
\ No newline at end of file
diff --git a/src/runtime/internal/await_block.ts b/src/runtime/internal/await_block.ts
index 3821520837..4b7ca6fd21 100644
--- a/src/runtime/internal/await_block.ts
+++ b/src/runtime/internal/await_block.ts
@@ -59,12 +59,12 @@ export function handle_promise(promise, info) {
 			update(info.then, 1, info.value, value);
 			set_current_component(null);
 		}, error => {
-			if (!info.hasCatch) {
-				throw error;
-			}
 			set_current_component(current_component);
 			update(info.catch, 2, info.error, error);
 			set_current_component(null);
+			if (!info.hasCatch) {
+				throw error;
+			}
 		});
 
 		// if we previously had a then/catch block, destroy it
diff --git a/test/css/samples/attribute-selector-details-open/expected.css b/test/css/samples/attribute-selector-details-open/expected.css
new file mode 100644
index 0000000000..20543c5c8e
--- /dev/null
+++ b/test/css/samples/attribute-selector-details-open/expected.css
@@ -0,0 +1 @@
+details[open].svelte-xyz{color:red}
\ No newline at end of file
diff --git a/test/css/samples/attribute-selector-details-open/input.svelte b/test/css/samples/attribute-selector-details-open/input.svelte
new file mode 100644
index 0000000000..f8cb70eff7
--- /dev/null
+++ b/test/css/samples/attribute-selector-details-open/input.svelte
@@ -0,0 +1,7 @@
+<details>Hello</details>
+
+<style>
+	details[open] {
+		color: red;
+	}
+</style>
diff --git a/test/css/samples/child-combinator/expected.css b/test/css/samples/child-combinator/expected.css
new file mode 100644
index 0000000000..5d50ae16d7
--- /dev/null
+++ b/test/css/samples/child-combinator/expected.css
@@ -0,0 +1 @@
+main.svelte-xyz button.svelte-xyz.svelte-xyz{background-color:red}main.svelte-xyz div.svelte-xyz>button.svelte-xyz{background-color:blue}
\ No newline at end of file
diff --git a/test/css/samples/child-combinator/input.svelte b/test/css/samples/child-combinator/input.svelte
new file mode 100644
index 0000000000..9d5d8d27e0
--- /dev/null
+++ b/test/css/samples/child-combinator/input.svelte
@@ -0,0 +1,14 @@
+<style>
+  main button {
+    background-color: red;
+  }
+
+  main div > button {
+    background-color: blue;
+  }
+</style>
+<main>
+  <div>
+    <button type="submit">Blue</button>
+  </div>
+</main>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-await-not-exhaustive/_config.js b/test/css/samples/general-siblings-combinator-await-not-exhaustive/_config.js
new file mode 100644
index 0000000000..c81f1a9f82
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await-not-exhaustive/_config.js
@@ -0,0 +1,3 @@
+export default {
+	warnings: []
+};
diff --git a/test/css/samples/general-siblings-combinator-await-not-exhaustive/expected.css b/test/css/samples/general-siblings-combinator-await-not-exhaustive/expected.css
new file mode 100644
index 0000000000..54eefc6088
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await-not-exhaustive/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.b.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.e.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.f.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.g.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.h.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz~.e.svelte-xyz~.f.svelte-xyz~.h.svelte-xyz{color:green}.b.svelte-xyz~.d.svelte-xyz~.h.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.g.svelte-xyz.svelte-xyz.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-await-not-exhaustive/expected.html b/test/css/samples/general-siblings-combinator-await-not-exhaustive/expected.html
new file mode 100644
index 0000000000..de97b02a5e
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await-not-exhaustive/expected.html
@@ -0,0 +1,4 @@
+<div class="a svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
+<div class="f svelte-xyz"></div>
+<div class="h svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-await-not-exhaustive/input.svelte b/test/css/samples/general-siblings-combinator-await-not-exhaustive/input.svelte
new file mode 100644
index 0000000000..a677077c33
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await-not-exhaustive/input.svelte
@@ -0,0 +1,41 @@
+<script>
+	let promise = Promise.resolve();
+</script>
+
+<style>
+	.a ~ .b { color: green; }
+	.a ~ .c { color: green; }
+	.a ~ .d { color: green; }
+	.a ~ .e { color: green; }
+	.a ~ .f { color: green; }
+	.a ~ .g { color: green; }
+	.a ~ .h { color: green; }
+	
+	.b ~ .d { color: green; }
+	.c ~ .d { color: green; }
+	.b ~ .e ~ .f ~ .h { color: green; }
+	.b ~ .d ~ .h { color: green; }
+	.c ~ .g { color: green; }
+</style>
+
+<div class="a" />
+
+{#await promise then value}
+	<div class="b" />
+{:catch error}
+	<div class="c" />
+{/await}
+
+{#await promise}
+	<div class="d" />
+{:catch error}
+	<div class="e" />
+{/await}
+
+{#await promise}
+	<div class="f" />
+{:then error}
+	<div class="g" />
+{/await}
+
+<div class="h" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-await/_config.js b/test/css/samples/general-siblings-combinator-await/_config.js
new file mode 100644
index 0000000000..b4ebe41828
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await/_config.js
@@ -0,0 +1,46 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				13:
+				14:   /* no match */
+				15:   .b ~ .c { color: green; }
+				      ^
+				16:   .c ~ .d { color: green; }
+				17:   .b ~ .d { color: green; }`,
+			message: 'Unused CSS selector ".b ~ .c"',
+			pos: 269,
+			start: { character: 269, column: 1, line: 15 },
+			end: { character: 276, column: 8, line: 15 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				14:   /* no match */
+				15:   .b ~ .c { color: green; }
+				16:   .c ~ .d { color: green; }
+				      ^
+				17:   .b ~ .d { color: green; }
+				18: </style>`,
+			message: 'Unused CSS selector ".c ~ .d"',
+			pos: 296,
+			start: { character: 296, column: 1, line: 16 },
+			end: { character: 303, column: 8, line: 16 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				15:   .b ~ .c { color: green; }
+				16:   .c ~ .d { color: green; }
+				17:   .b ~ .d { color: green; }
+				      ^
+				18: </style>
+				19:`,
+			message: 'Unused CSS selector ".b ~ .d"',
+			pos: 323,
+			start: { character: 323, column: 1, line: 17 },
+			end: { character: 330, column: 8, line: 17 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-await/expected.css b/test/css/samples/general-siblings-combinator-await/expected.css
new file mode 100644
index 0000000000..94a5494597
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.b.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz{color:green}.a.svelte-xyz~.d.svelte-xyz{color:green}.b.svelte-xyz~.e.svelte-xyz{color:green}.c.svelte-xyz~.e.svelte-xyz{color:green}.d.svelte-xyz~.e.svelte-xyz{color:green}.a.svelte-xyz~.e.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-await/expected.html b/test/css/samples/general-siblings-combinator-await/expected.html
new file mode 100644
index 0000000000..3d8ac9f966
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="e svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-await/input.svelte b/test/css/samples/general-siblings-combinator-await/input.svelte
new file mode 100644
index 0000000000..8aeadab170
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-await/input.svelte
@@ -0,0 +1,30 @@
+<script>
+	let promise = Promise.resolve();
+</script>
+
+<style>
+	.a ~ .b { color: green; }
+	.a ~ .c { color: green; }
+	.a ~ .d { color: green; }
+	.b ~ .e { color: green; }
+	.c ~ .e { color: green; }
+	.d ~ .e { color: green; }
+	.a ~ .e { color: green; }
+
+	/* no match */
+	.b ~ .c { color: green; }
+	.c ~ .d { color: green; }
+	.b ~ .d { color: green; }
+</style>
+
+<div class="a" />
+
+{#await promise}
+	<div class="b" />
+{:then value}
+	<div class="c" />
+{:catch error}
+	<div class="d" />
+{/await}
+
+<div class="e" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-2/_config.js b/test/css/samples/general-siblings-combinator-each-2/_config.js
new file mode 100644
index 0000000000..c81f1a9f82
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-2/_config.js
@@ -0,0 +1,3 @@
+export default {
+	warnings: []
+};
diff --git a/test/css/samples/general-siblings-combinator-each-2/expected.css b/test/css/samples/general-siblings-combinator-each-2/expected.css
new file mode 100644
index 0000000000..d197058b24
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-2/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.b.svelte-xyz{color:green}.c.svelte-xyz~.d.svelte-xyz{color:green}.a.svelte-xyz~.d.svelte-xyz{color:green}.c.svelte-xyz~.b.svelte-xyz{color:green}.b.svelte-xyz~.c.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-2/expected.html b/test/css/samples/general-siblings-combinator-each-2/expected.html
new file mode 100644
index 0000000000..331a5e4317
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-2/expected.html
@@ -0,0 +1,4 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-2/input.svelte b/test/css/samples/general-siblings-combinator-each-2/input.svelte
new file mode 100644
index 0000000000..5bbdbdef66
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-2/input.svelte
@@ -0,0 +1,37 @@
+<script>
+	let array = [1];
+</script>
+
+<style>
+	/* boundary of each */
+	.a ~ .b {
+		color: green;
+	}
+	.c ~ .d {
+		color: green;
+	}
+	/* if array is empty */
+	.a ~ .d {
+		color: green;
+	}
+	/* if array has multiple items */
+	.c ~ .b {
+		color: green;
+	}
+	/* normal sibling */
+	.b ~ .c {
+		color: green;
+	}
+	.a ~ .c {
+		color: green;
+	}
+</style>
+
+<div class="a" />
+
+{#each array as item}
+	<div class="b" />
+	<div class="c" />
+{/each}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-else-nested/_config.js b/test/css/samples/general-siblings-combinator-each-else-nested/_config.js
new file mode 100644
index 0000000000..cf241d856d
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else-nested/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				33:
+				34:   /* no match */
+				35:   .e ~ .f { color: green; }
+				      ^
+				36: </style>
+				37:`,
+			message: 'Unused CSS selector ".e ~ .f"',
+			pos: 812,
+			start: { character: 812, column: 1, line: 35 },
+			end: { character: 819, column: 8, line: 35 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-each-else-nested/expected.css b/test/css/samples/general-siblings-combinator-each-else-nested/expected.css
new file mode 100644
index 0000000000..b055f35ecd
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else-nested/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.e.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.f.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz~.c.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.e.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.f.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz~.e.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz~.f.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz~.e.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz~.j.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.h.svelte-xyz~.j.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.i.svelte-xyz~.j.svelte-xyz.svelte-xyz{color:green}.m.svelte-xyz~.m.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.m.svelte-xyz~.l.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz~.m.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.g.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz~.e.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.g.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.k.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.g.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.h.svelte-xyz~.h.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz~.i.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.j.svelte-xyz~.j.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.j.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.h.svelte-xyz~.i.svelte-xyz~.j.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-else-nested/expected.html b/test/css/samples/general-siblings-combinator-each-else-nested/expected.html
new file mode 100644
index 0000000000..67dd05f677
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else-nested/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="f svelte-xyz"></div>
+<div class="k svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-else-nested/input.svelte b/test/css/samples/general-siblings-combinator-each-else-nested/input.svelte
new file mode 100644
index 0000000000..63a1123708
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else-nested/input.svelte
@@ -0,0 +1,77 @@
+<script>
+	let array = [];
+</script>
+
+<style>
+	.a ~ .e { color: green; }
+	.a ~ .f { color: green; }
+	.b ~ .c { color: green; }
+	.b ~ .d { color: green; }
+	.c ~ .e { color: green; }
+	.c ~ .f { color: green; }
+	.d ~ .e { color: green; }
+	.d ~ .f { color: green; }
+	.e ~ .e { color: green; }
+	.i ~ .j { color: green; }
+	.g ~ .h ~ .j { color: green; }
+	.g ~ .i ~ .j { color: green; }
+	.m ~ .m { color: green; }
+	.m ~ .l { color: green; }
+	.l ~ .m { color: green; }
+	.a ~ .c { color: green; }
+	.a ~ .g { color: green; }
+	.b ~ .e { color: green; }
+	.c ~ .g { color: green; }
+	.c ~ .k { color: green; }
+	.d ~ .d { color: green; }
+	.g ~ .g { color: green; }
+	.h ~ .h { color: green; }
+	.i ~ .i { color: green; }
+	.j ~ .j { color: green; }
+	.g ~ .j { color: green; }
+	.g ~ .h ~ .i ~ .j { color: green; }
+
+	/* no match */
+	.e ~ .f { color: green; }
+</style>
+
+<div class="a" />
+
+{#each array as a}
+	<div class="b" />
+	{#each array as b}
+		<div class="c" />
+	{:else}
+		<div class="d" />
+	{/each}
+{/each}
+
+{#each array as c}
+	{#each array as d}
+		<div class="e" />
+	{/each}
+{:else}
+	<div class="f" />
+{/each}
+
+{#each array as x}
+	<div class="g" />
+	{#each array as y}
+		{#each array as z}
+			<div class="h" />
+		{/each}
+	{:else}
+		<div class="i" />
+	{/each}
+	<div class="j" />
+{/each}
+
+<div class="k" />
+
+{#each array as item}
+	{#each array as item}
+		<div class="l" />
+	{:else}
+		<div class="m" />
+	{/each}
+{/each}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-else/_config.js b/test/css/samples/general-siblings-combinator-each-else/_config.js
new file mode 100644
index 0000000000..4d9beceeb2
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				11:
+				12:   /* no match */
+				13:   .b ~ .c { color: green; }
+				      ^
+				14: </style>
+				15:`,
+			message: 'Unused CSS selector ".b ~ .c"',
+			pos: 199,
+			start: { character: 199, column: 1, line: 13 },
+			end: { character: 206, column: 8, line: 13 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-each-else/expected.css b/test/css/samples/general-siblings-combinator-each-else/expected.css
new file mode 100644
index 0000000000..31fafa3243
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.b.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz{color:green}.b.svelte-xyz~.d.svelte-xyz{color:green}.c.svelte-xyz~.d.svelte-xyz{color:green}.a.svelte-xyz~.d.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-else/expected.html b/test/css/samples/general-siblings-combinator-each-else/expected.html
new file mode 100644
index 0000000000..fb838a55fd
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-else/input.svelte b/test/css/samples/general-siblings-combinator-each-else/input.svelte
new file mode 100644
index 0000000000..5cd78853ca
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-else/input.svelte
@@ -0,0 +1,24 @@
+<script>
+	let array = [];
+</script>
+
+<style>
+	.a ~ .b { color: green; }
+	.a ~ .c { color: green; }
+	.b ~ .d { color: green; }
+	.c ~ .d { color: green; }
+	.a ~ .d { color: green; }
+	
+	/* no match */
+	.b ~ .c { color: green; }
+</style>
+
+<div class="a" />
+
+{#each array as item}
+	<div class="b" />
+{:else}
+	<div class="c" />
+{/each}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-nested/_config.js b/test/css/samples/general-siblings-combinator-each-nested/_config.js
new file mode 100644
index 0000000000..c81f1a9f82
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-nested/_config.js
@@ -0,0 +1,3 @@
+export default {
+	warnings: []
+};
diff --git a/test/css/samples/general-siblings-combinator-each-nested/expected.css b/test/css/samples/general-siblings-combinator-each-nested/expected.css
new file mode 100644
index 0000000000..5bf1f832ae
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-nested/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.d.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.e.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.f.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.g.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.d.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.e.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.f.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.g.svelte-xyz.svelte-xyz{color:green}.j.svelte-xyz~.m.svelte-xyz.svelte-xyz{color:green}.j.svelte-xyz~.n.svelte-xyz.svelte-xyz{color:green}.j.svelte-xyz~.o.svelte-xyz.svelte-xyz{color:green}.k.svelte-xyz~.m.svelte-xyz.svelte-xyz{color:green}.k.svelte-xyz~.n.svelte-xyz.svelte-xyz{color:green}.k.svelte-xyz~.o.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz~.m.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz~.n.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz~.o.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz~.e.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz~.f.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.h.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz~.d.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz~.e.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz~.f.svelte-xyz.svelte-xyz{color:green}.h.svelte-xyz~.g.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz~.h.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz~.g.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz~.d.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz~.e.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz~.f.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.g.svelte-xyz.svelte-xyz{color:green}.h.svelte-xyz~.h.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz~.i.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz~.e.svelte-xyz~.f.svelte-xyz{color:green}.e.svelte-xyz~.e.svelte-xyz~.d.svelte-xyz{color:green}.h.svelte-xyz~.h.svelte-xyz~.i.svelte-xyz{color:green}.h.svelte-xyz~.h.svelte-xyz~.g.svelte-xyz{color:green}.a.svelte-xyz~.h.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.i.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.h.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.i.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz~.f.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz~.g.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz~.g.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz~.i.svelte-xyz.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-nested/expected.html b/test/css/samples/general-siblings-combinator-each-nested/expected.html
new file mode 100644
index 0000000000..340d6fc4c8
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-nested/expected.html
@@ -0,0 +1,15 @@
+<div class="a svelte-xyz"></div>
+<div class="b"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
+<div class="e svelte-xyz"></div>
+<div class="f svelte-xyz"></div>
+<div class="g svelte-xyz"></div>
+<div class="h svelte-xyz"></div>
+<div class="i svelte-xyz"></div>
+<div class="j svelte-xyz"></div>
+<div class="k svelte-xyz"></div>
+<div class="l svelte-xyz"></div>
+<div class="m svelte-xyz"></div>
+<div class="n svelte-xyz"></div>
+<div class="o svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each-nested/input.svelte b/test/css/samples/general-siblings-combinator-each-nested/input.svelte
new file mode 100644
index 0000000000..b7c7377015
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each-nested/input.svelte
@@ -0,0 +1,113 @@
+<script>
+	let array = [1];
+</script>
+
+<style>
+	/* boundary of each */
+	.a ~ .d { color: green; }
+	.a ~ .e { color: green; }
+	.a ~ .f { color: green; }
+	.a ~ .g { color: green; }
+	.c ~ .d { color: green; }
+	.c ~ .e { color: green; }
+	.c ~ .f { color: green; }
+	.c ~ .g { color: green; }
+
+	/* nested boundary of each */
+	.j ~ .m { color: green; }
+	.j ~ .n { color: green; }
+	.j ~ .o { color: green; }
+	.k ~ .m { color: green; }
+	.k ~ .n { color: green; }
+	.k ~ .o { color: green; }
+	.l ~ .m { color: green; }
+	.l ~ .n { color: green; }
+	.l ~ .o { color: green; }
+
+	/* parent each */
+	.d ~ .e { color: green; }
+	.e ~ .f { color: green; }
+
+	/* child each */
+	.g ~ .h { color: green; }
+
+	/* wrap around */
+	.f ~ .d { color: green; }
+	.f ~ .e { color: green; }
+	.f ~ .f { color: green; }
+
+	.h ~ .g { color: green; }
+	.i ~ .h { color: green; }
+	.i ~ .g { color: green; }
+
+	/* wrap around self */
+	.d ~ .d { color: green; }
+	.e ~ .e { color: green; }
+	.f ~ .f { color: green; }
+	.g ~ .g { color: green; }
+	.h ~ .h { color: green; }
+	.i ~ .i { color: green; }
+
+	/* wrap around self ~ next */
+	.e ~ .e ~ .f { color: green; }
+	.e ~ .e ~ .d { color: green; }
+	.h ~ .h ~ .i { color: green; }
+	.h ~ .h ~ .g { color: green; }
+
+	/* general siblings */
+	.a ~ .h { color: green; }
+	.a ~ .i { color: green; }
+	.c ~ .h { color: green; }
+	.c ~ .i { color: green; }
+	.d ~ .f { color: green; }
+	.d ~ .g { color: green; }
+	.e ~ .g { color: green; }
+	.g ~ .i { color: green; }
+</style>
+
+<div class="a" />
+
+{#each array as item}
+	<div class="b" />
+	<div class="c" />
+{/each}
+
+{#each array as item}
+	{#each array as item}
+		{#each array as item}
+			<div class="d" />
+		{/each}
+		<div class="e" />
+	{/each}
+	<div class="f" />
+{/each}
+
+{#each array as item}
+	<div class="g" />
+	{#each array as item}
+		<div class="h" />
+		{#each array as item}
+			<div class="i" />
+		{/each}
+	{/each}
+{/each}
+
+{#each array as item}
+	<div class="j" />
+	{#each array as item}
+		<div class="k" />
+		{#each array as item}
+			<div class="l" />
+		{/each}
+	{/each}
+{/each}
+
+{#each array as item}
+	{#each array as item}
+		{#each array as item}
+			<div class="m" />
+		{/each}
+		<div class="n" />
+	{/each}
+	<div class="o" />
+{/each}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each/expected.css b/test/css/samples/general-siblings-combinator-each/expected.css
new file mode 100644
index 0000000000..8c48251bdd
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each/expected.css
@@ -0,0 +1 @@
+div.svelte-xyz~span.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-each/expected.html b/test/css/samples/general-siblings-combinator-each/expected.html
new file mode 100644
index 0000000000..9d0416f01b
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each/expected.html
@@ -0,0 +1,6 @@
+<div class="svelte-xyz"></div>
+<span class="each svelte-xyz"></span>
+<div class="each svelte-xyz"></div>
+<span class="each svelte-xyz"></span>
+<div class="each svelte-xyz"></div>
+<span class="svelte-xyz"></span>
diff --git a/test/css/samples/general-siblings-combinator-each/input.svelte b/test/css/samples/general-siblings-combinator-each/input.svelte
new file mode 100644
index 0000000000..ce65da109d
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-each/input.svelte
@@ -0,0 +1,20 @@
+<script>
+	let array = [1];
+</script>
+
+<style>
+	div ~ span {
+		color: green;
+	}
+</style>
+
+<div />
+
+{#each array as item}
+	<span class="each" />
+	<div class="each" />
+	<span class="each" />
+	<div class="each" />
+{/each}
+
+<span />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/_config.js b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/_config.js
new file mode 100644
index 0000000000..0b5d391f50
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				16:
+				17:   /* no match */
+				18:   .b ~ .c { color: green; }
+				      ^
+				19: </style>
+				20:`,
+			message: 'Unused CSS selector ".b ~ .c"',
+			pos: 319,
+			start: { character: 319, column: 1, line: 18 },
+			end: { character: 326, column: 8, line: 18 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/expected.css b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/expected.css
new file mode 100644
index 0000000000..e6a974efca
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.b.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz~.c.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz~.c.svelte-xyz~.d.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz~.c.svelte-xyz~.d.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/expected.html b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/expected.html
new file mode 100644
index 0000000000..fb838a55fd
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/input.svelte b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/input.svelte
new file mode 100644
index 0000000000..2b53f7b5b8
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/input.svelte
@@ -0,0 +1,31 @@
+<script>
+	let foo = false;
+	let array = [1];
+</script>
+
+<style>
+	.a ~ .b { color: green; }
+	.a ~ .c { color: green; }
+	.a ~ .d { color: green; }
+	.b ~ .d { color: green; }
+	.c ~ .d { color: green; }
+
+	.a ~ .c ~ .c { color: green; }
+	.c ~ .c ~ .d { color: green; }
+	.a ~ .c ~ .c ~ .d { color: green; }
+
+	/* no match */
+	.b ~ .c { color: green; }
+</style>
+
+<div class="a" />
+
+{#if foo}
+	<div class="b" />
+{:else}
+	{#each array as item}
+		<div class="c" />
+	{/each}
+{/if}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive/_config.js b/test/css/samples/general-siblings-combinator-if-not-exhaustive/_config.js
new file mode 100644
index 0000000000..81fb595d68
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				12:
+				13:   /* no match */
+				14:   .b ~ .c { color: green; }
+				      ^
+				15: </style>
+				16:`,
+			message: 'Unused CSS selector ".b ~ .c"',
+			pos: 215,
+			start: { character: 215, column: 1, line: 14 },
+			end: { character: 222, column: 8, line: 14 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive/expected.css b/test/css/samples/general-siblings-combinator-if-not-exhaustive/expected.css
new file mode 100644
index 0000000000..dc7ee1b62b
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.b.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz{color:green}.a.svelte-xyz~.d.svelte-xyz{color:green}.b.svelte-xyz~.d.svelte-xyz{color:green}.c.svelte-xyz~.d.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive/expected.html b/test/css/samples/general-siblings-combinator-if-not-exhaustive/expected.html
new file mode 100644
index 0000000000..813e778dc6
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if-not-exhaustive/input.svelte b/test/css/samples/general-siblings-combinator-if-not-exhaustive/input.svelte
new file mode 100644
index 0000000000..3e5c5af7a2
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if-not-exhaustive/input.svelte
@@ -0,0 +1,25 @@
+<script>
+	let foo = true;
+	let bar = true;
+</script>
+
+<style>
+	.a ~ .b { color: green; }
+	.a ~ .c { color: green; }
+	.a ~ .d { color: green; }
+	.b ~ .d { color: green; }
+	.c ~ .d { color: green; }
+
+	/* no match */
+	.b ~ .c { color: green; }
+</style>
+
+<div class="a" />
+
+{#if foo}
+	<div class="b" />
+{:else if bar}
+	<div class="c" />
+{/if}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if/_config.js b/test/css/samples/general-siblings-combinator-if/_config.js
new file mode 100644
index 0000000000..cbc3d8a784
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if/_config.js
@@ -0,0 +1,46 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				14:
+				15:   /* no match */
+				16:   .b ~ .c { color: green; }
+				      ^
+				17:   .b ~ .d { color: green; }
+				18:   .c ~ .d { color: green; }`,
+			message: 'Unused CSS selector ".b ~ .c"',
+			pos: 269,
+			start: { character: 269, column: 1, line: 16 },
+			end: { character: 276, column: 8, line: 16 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				15:   /* no match */
+				16:   .b ~ .c { color: green; }
+				17:   .b ~ .d { color: green; }
+				      ^
+				18:   .c ~ .d { color: green; }
+				19: </style>`,
+			message: 'Unused CSS selector ".b ~ .d"',
+			pos: 296,
+			start: { character: 296, column: 1, line: 17 },
+			end: { character: 303, column: 8, line: 17 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				16:   .b ~ .c { color: green; }
+				17:   .b ~ .d { color: green; }
+				18:   .c ~ .d { color: green; }
+				      ^
+				19: </style>
+				20:`,
+			message: 'Unused CSS selector ".c ~ .d"',
+			pos: 323,
+			start: { character: 323, column: 1, line: 18 },
+			end: { character: 330, column: 8, line: 18 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-if/expected.css b/test/css/samples/general-siblings-combinator-if/expected.css
new file mode 100644
index 0000000000..94a5494597
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz~.b.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz{color:green}.a.svelte-xyz~.d.svelte-xyz{color:green}.b.svelte-xyz~.e.svelte-xyz{color:green}.c.svelte-xyz~.e.svelte-xyz{color:green}.d.svelte-xyz~.e.svelte-xyz{color:green}.a.svelte-xyz~.e.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if/expected.html b/test/css/samples/general-siblings-combinator-if/expected.html
new file mode 100644
index 0000000000..3d8ac9f966
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="e svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-if/input.svelte b/test/css/samples/general-siblings-combinator-if/input.svelte
new file mode 100644
index 0000000000..fca5499f2e
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-if/input.svelte
@@ -0,0 +1,31 @@
+<script>
+	let foo = true;
+	let bar = true;
+</script>
+
+<style>
+	.a ~ .b { color: green; }
+	.a ~ .c { color: green; }
+	.a ~ .d { color: green; }
+	.b ~ .e { color: green; }
+	.c ~ .e { color: green; }
+	.d ~ .e { color: green; }
+	.a ~ .e { color: green; }
+
+	/* no match */
+	.b ~ .c { color: green; }
+	.b ~ .d { color: green; }
+	.c ~ .d { color: green; }
+</style>
+
+<div class="a" />
+
+{#if foo}
+	<div class="b" />
+{:else if bar}
+	<div class="c" />
+{:else}
+	<div class="d" />
+{/if}
+
+<div class="e" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-slot/_config.js b/test/css/samples/general-siblings-combinator-slot/_config.js
new file mode 100644
index 0000000000..4cf743c0a0
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-slot/_config.js
@@ -0,0 +1,88 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				 8:
+				 9:   /* no match */
+				10:   .a ~ .b { color: green; }
+				      ^
+				11:   .b ~ .c { color: green; }
+				12:   .c ~ .f { color: green; }`,
+			message: 'Unused CSS selector ".a ~ .b"',
+			pos: 111,
+			start: { character: 111, column: 1, line: 10 },
+			end: { character: 118, column: 8, line: 10 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				 9:   /* no match */
+				10:   .a ~ .b { color: green; }
+				11:   .b ~ .c { color: green; }
+				      ^
+				12:   .c ~ .f { color: green; }
+				13:   .f ~ .g { color: green; }`,
+			message: 'Unused CSS selector ".b ~ .c"',
+			pos: 138,
+			start: { character: 138, column: 1, line: 11 },
+			end: { character: 145, column: 8, line: 11 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				10:   .a ~ .b { color: green; }
+				11:   .b ~ .c { color: green; }
+				12:   .c ~ .f { color: green; }
+				      ^
+				13:   .f ~ .g { color: green; }
+				14:   .b ~ .f { color: green; }`,
+			message: 'Unused CSS selector ".c ~ .f"',
+			pos: 165,
+			start: { character: 165, column: 1, line: 12 },
+			end: { character: 172, column: 8, line: 12 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				11:   .b ~ .c { color: green; }
+				12:   .c ~ .f { color: green; }
+				13:   .f ~ .g { color: green; }
+				      ^
+				14:   .b ~ .f { color: green; }
+				15:   .b ~ .g { color: green; }`,
+			message: 'Unused CSS selector ".f ~ .g"',
+			pos: 192,
+			start: { character: 192, column: 1, line: 13 },
+			end: { character: 199, column: 8, line: 13 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				12:   .c ~ .f { color: green; }
+				13:   .f ~ .g { color: green; }
+				14:   .b ~ .f { color: green; }
+				      ^
+				15:   .b ~ .g { color: green; }
+				16: </style>`,
+			message: 'Unused CSS selector ".b ~ .f"',
+			pos: 219,
+			start: { character: 219, column: 1, line: 14 },
+			end: { character: 226, column: 8, line: 14 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				13:   .f ~ .g { color: green; }
+				14:   .b ~ .f { color: green; }
+				15:   .b ~ .g { color: green; }
+				      ^
+				16: </style>
+				17:`,
+			message: 'Unused CSS selector ".b ~ .g"',
+			pos: 246,
+			start: { character: 246, column: 1, line: 15 },
+			end: { character: 253, column: 8, line: 15 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-slot/expected.css b/test/css/samples/general-siblings-combinator-slot/expected.css
new file mode 100644
index 0000000000..29325e0cef
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-slot/expected.css
@@ -0,0 +1 @@
+.d.svelte-xyz~.e.svelte-xyz{color:green}.a.svelte-xyz~.g.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-slot/input.svelte b/test/css/samples/general-siblings-combinator-slot/input.svelte
new file mode 100644
index 0000000000..e5af4c0962
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-slot/input.svelte
@@ -0,0 +1,30 @@
+<script>
+	let App;
+</script>
+
+<style>
+	.d ~ .e { color: green; }
+	.a ~ .g { color: green; }
+	
+	/* no match */
+	.a ~ .b { color: green; }
+	.b ~ .c { color: green; }
+	.c ~ .f { color: green; }
+	.f ~ .g { color: green; }
+	.b ~ .f { color: green; }
+	.b ~ .g { color: green; }
+</style>
+
+<div class="a" />
+<App>
+	<div class="b" slot="a" />
+
+	<div class="c" slot="b">
+		<div class="d" />
+		<div class="e" />
+	</div>
+
+	<div class="f" slot="c" />
+</App>
+
+<div class="g" />
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-star/_config.js b/test/css/samples/general-siblings-combinator-star/_config.js
new file mode 100644
index 0000000000..64e5baad19
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-star/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				3:     margin-left: 4px;
+				4:   }
+				5:   .not-match > * ~ * {
+				     ^
+				6:     margin-left: 4px;
+				7:   }`,
+			message: 'Unused CSS selector ".not-match > * ~ *"',
+			pos: 50,
+			start: { character: 50, column: 1, line: 5 },
+      end: { character: 68, column: 19, line: 5 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator-star/expected.css b/test/css/samples/general-siblings-combinator-star/expected.css
new file mode 100644
index 0000000000..de947fa47e
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-star/expected.css
@@ -0,0 +1 @@
+.match.svelte-xyz>.svelte-xyz~.svelte-xyz{margin-left:4px}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-star/expected.html b/test/css/samples/general-siblings-combinator-star/expected.html
new file mode 100644
index 0000000000..1cfae6e6f7
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-star/expected.html
@@ -0,0 +1,7 @@
+<div class="not-match">
+  <div></div>
+</div>
+<div class="match svelte-xyz">
+  <div class="svelte-xyz"></div>
+  <div class="svelte-xyz"></div>
+</div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator-star/input.svelte b/test/css/samples/general-siblings-combinator-star/input.svelte
new file mode 100644
index 0000000000..a069685d4f
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator-star/input.svelte
@@ -0,0 +1,17 @@
+<style>
+	.match > * ~ * {
+		margin-left: 4px;
+	}
+	.not-match > * ~ * {
+		margin-left: 4px;
+	}
+</style>
+
+<div class="not-match">
+	<div />
+</div>
+
+<div class="match">
+	<div />
+	<div />
+</div>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator/_config.js b/test/css/samples/general-siblings-combinator/_config.js
new file mode 100644
index 0000000000..6513366549
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator/_config.js
@@ -0,0 +1,60 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				10:
+				11:   /* no match */
+				12:   article ~ div { color: green; }
+				      ^
+				13:   span ~ article { color: green; }
+				14:   b ~ article { color: green; }`,
+			message: 'Unused CSS selector "article ~ div"',
+			pos: 275,
+			start: { character: 275, column: 1, line: 12 },
+			end: { character: 288, column: 14, line: 12 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				11:   /* no match */
+				12:   article ~ div { color: green; }
+				13:   span ~ article { color: green; }
+				      ^
+				14:   b ~ article { color: green; }
+				15:   span ~ div { color: green; }`,
+			message: 'Unused CSS selector "span ~ article"',
+			pos: 308,
+			start: { character: 308, column: 1, line: 13 },
+			end: { character: 322, column: 15, line: 13 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				12:   article ~ div { color: green; }
+				13:   span ~ article { color: green; }
+				14:   b ~ article { color: green; }
+				      ^
+				15:   span ~ div { color: green; }
+				16: </style>`,
+			message: 'Unused CSS selector "b ~ article"',
+			pos: 342,
+			start: { character: 342, column: 1, line: 14 },
+			end: { character: 353, column: 12, line: 14 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				13:   span ~ article { color: green; }
+				14:   b ~ article { color: green; }
+				15:   span ~ div { color: green; }
+				      ^
+				16: </style>
+				17:`,
+			message: 'Unused CSS selector "span ~ div"',
+			pos: 373,
+			start: { character: 373, column: 1, line: 15 },
+			end: { character: 383, column: 11, line: 15 }
+		}
+	]
+};
diff --git a/test/css/samples/general-siblings-combinator/expected.css b/test/css/samples/general-siblings-combinator/expected.css
new file mode 100644
index 0000000000..647a53f778
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator/expected.css
@@ -0,0 +1 @@
+div.svelte-xyz~article.svelte-xyz.svelte-xyz{color:green}span.svelte-xyz~b.svelte-xyz.svelte-xyz{color:green}div.svelte-xyz span.svelte-xyz~b.svelte-xyz{color:green}.a.svelte-xyz~article.svelte-xyz.svelte-xyz{color:green}div.svelte-xyz~.b.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~.c.svelte-xyz.svelte-xyz{color:green}article.svelte-xyz~details.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz~details.svelte-xyz.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator/expected.html b/test/css/samples/general-siblings-combinator/expected.html
new file mode 100644
index 0000000000..01fbffcae4
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator/expected.html
@@ -0,0 +1,7 @@
+<div class="a svelte-xyz">
+  <span class="svelte-xyz"></span>
+  <b class="svelte-xyz"></b>
+</div>
+<article class="b svelte-xyz"></article>
+<p class="c svelte-xyz"></p>
+<details class="d svelte-xyz"></details>
\ No newline at end of file
diff --git a/test/css/samples/general-siblings-combinator/input.svelte b/test/css/samples/general-siblings-combinator/input.svelte
new file mode 100644
index 0000000000..533702a3a3
--- /dev/null
+++ b/test/css/samples/general-siblings-combinator/input.svelte
@@ -0,0 +1,24 @@
+<style>
+	div ~ article { color: green; }
+	span ~ b { color: green; }
+	div span ~ b { color: green; }
+	.a ~ article { color: green; }
+	div ~ .b { color: green; }
+	.a ~ .c { color: green; }
+	article ~ details { color: green; }
+	.a ~ details { color: green; }
+
+	/* no match */
+	article ~ div { color: green; }
+	span ~ article { color: green; }
+	b ~ article { color: green; }
+	span ~ div { color: green; }
+</style>
+
+<div class="a">
+	<span />
+	<b />
+</div>
+<article class="b"></article>
+<p class="c"></p>
+<details class="d"></details>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-await-not-exhaustive/_config.js b/test/css/samples/siblings-combinator-await-not-exhaustive/_config.js
new file mode 100644
index 0000000000..c81f1a9f82
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await-not-exhaustive/_config.js
@@ -0,0 +1,3 @@
+export default {
+	warnings: []
+};
diff --git a/test/css/samples/siblings-combinator-await-not-exhaustive/expected.css b/test/css/samples/siblings-combinator-await-not-exhaustive/expected.css
new file mode 100644
index 0000000000..60bb8e92dc
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await-not-exhaustive/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.b.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.e.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.f.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.g.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.h.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz+.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz+.e.svelte-xyz+.f.svelte-xyz+.h.svelte-xyz{color:green}.b.svelte-xyz+.d.svelte-xyz+.h.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.g.svelte-xyz.svelte-xyz.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-await-not-exhaustive/expected.html b/test/css/samples/siblings-combinator-await-not-exhaustive/expected.html
new file mode 100644
index 0000000000..de97b02a5e
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await-not-exhaustive/expected.html
@@ -0,0 +1,4 @@
+<div class="a svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
+<div class="f svelte-xyz"></div>
+<div class="h svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-await-not-exhaustive/input.svelte b/test/css/samples/siblings-combinator-await-not-exhaustive/input.svelte
new file mode 100644
index 0000000000..d3345c6edc
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await-not-exhaustive/input.svelte
@@ -0,0 +1,41 @@
+<script>
+	let promise = Promise.resolve();
+</script>
+
+<style>
+	.a + .b { color: green; }
+	.a + .c { color: green; }
+	.a + .d { color: green; }
+	.a + .e { color: green; }
+	.a + .f { color: green; }
+	.a + .g { color: green; }
+	.a + .h { color: green; }
+	
+	.b + .d { color: green; }
+	.c + .d { color: green; }
+	.b + .e + .f + .h { color: green; }
+	.b + .d + .h { color: green; }
+	.c + .g { color: green; }
+</style>
+
+<div class="a" />
+
+{#await promise then value}
+	<div class="b" />
+{:catch error}
+	<div class="c" />
+{/await}
+
+{#await promise}
+	<div class="d" />
+{:catch error}
+	<div class="e" />
+{/await}
+
+{#await promise}
+	<div class="f" />
+{:then error}
+	<div class="g" />
+{/await}
+
+<div class="h" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-await/_config.js b/test/css/samples/siblings-combinator-await/_config.js
new file mode 100644
index 0000000000..5af12d38e5
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await/_config.js
@@ -0,0 +1,60 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				12:
+				13:   /* no match */
+				14:   .a + .e { color: green; }
+				      ^
+				15:   .b + .c { color: green; }
+				16:   .c + .d { color: green; }`,
+			message: 'Unused CSS selector ".a + .e"',
+			pos: 242,
+			start: { character: 242, column: 1, line: 14 },
+			end: { character: 249, column: 8, line: 14 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				13:   /* no match */
+				14:   .a + .e { color: green; }
+				15:   .b + .c { color: green; }
+				      ^
+				16:   .c + .d { color: green; }
+				17:   .b + .d { color: green; }`,
+			message: 'Unused CSS selector ".b + .c"',
+			pos: 269,
+			start: { character: 269, column: 1, line: 15 },
+			end: { character: 276, column: 8, line: 15 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				14:   .a + .e { color: green; }
+				15:   .b + .c { color: green; }
+				16:   .c + .d { color: green; }
+				      ^
+				17:   .b + .d { color: green; }
+				18: </style>`,
+			message: 'Unused CSS selector ".c + .d"',
+			pos: 296,
+			start: { character: 296, column: 1, line: 16 },
+			end: { character: 303, column: 8, line: 16 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				15:   .b + .c { color: green; }
+				16:   .c + .d { color: green; }
+				17:   .b + .d { color: green; }
+				      ^
+				18: </style>
+				19:`,
+			message: 'Unused CSS selector ".b + .d"',
+			pos: 323,
+			start: { character: 323, column: 1, line: 17 },
+			end: { character: 330, column: 8, line: 17 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-await/expected.css b/test/css/samples/siblings-combinator-await/expected.css
new file mode 100644
index 0000000000..5ea39be7c2
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.b.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz{color:green}.a.svelte-xyz+.d.svelte-xyz{color:green}.b.svelte-xyz+.e.svelte-xyz{color:green}.c.svelte-xyz+.e.svelte-xyz{color:green}.d.svelte-xyz+.e.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-await/expected.html b/test/css/samples/siblings-combinator-await/expected.html
new file mode 100644
index 0000000000..3d8ac9f966
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="e svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-await/input.svelte b/test/css/samples/siblings-combinator-await/input.svelte
new file mode 100644
index 0000000000..07698c2a30
--- /dev/null
+++ b/test/css/samples/siblings-combinator-await/input.svelte
@@ -0,0 +1,30 @@
+<script>
+	let promise = Promise.resolve();
+</script>
+
+<style>
+	.a + .b { color: green; }
+	.a + .c { color: green; }
+	.a + .d { color: green; }
+	.b + .e { color: green; }
+	.c + .e { color: green; }
+	.d + .e { color: green; }
+
+	/* no match */
+	.a + .e { color: green; }
+	.b + .c { color: green; }
+	.c + .d { color: green; }
+	.b + .d { color: green; }
+</style>
+
+<div class="a" />
+
+{#await promise}
+	<div class="b" />
+{:then value}
+	<div class="c" />
+{:catch error}
+	<div class="d" />
+{/await}
+
+<div class="e" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-2/_config.js b/test/css/samples/siblings-combinator-each-2/_config.js
new file mode 100644
index 0000000000..e4799f1055
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-2/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+		  code: "css-unused-selector",
+			frame: `
+				24:   }
+				25:   /* not match */
+				26:   .a + .c {
+				      ^
+				27:     color: green;
+				28:   }`,
+		  message: 'Unused CSS selector ".a + .c"',
+		  pos: 320,
+		  start: { character: 320, column: 1, line: 26 },
+		  end: { character: 327, column: 8, line: 26 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-each-2/expected.css b/test/css/samples/siblings-combinator-each-2/expected.css
new file mode 100644
index 0000000000..60fa224269
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-2/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.b.svelte-xyz{color:green}.c.svelte-xyz+.d.svelte-xyz{color:green}.a.svelte-xyz+.d.svelte-xyz{color:green}.c.svelte-xyz+.b.svelte-xyz{color:green}.b.svelte-xyz+.c.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-2/expected.html b/test/css/samples/siblings-combinator-each-2/expected.html
new file mode 100644
index 0000000000..331a5e4317
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-2/expected.html
@@ -0,0 +1,4 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-2/input.svelte b/test/css/samples/siblings-combinator-each-2/input.svelte
new file mode 100644
index 0000000000..bbad045fbc
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-2/input.svelte
@@ -0,0 +1,38 @@
+<script>
+	let array = [1];
+</script>
+
+<style>
+	/* boundary of each */
+	.a + .b {
+		color: green;
+	}
+	.c + .d {
+		color: green;
+	}
+	/* if array is empty */
+	.a + .d {
+		color: green;
+	}
+	/* if array has multiple items */
+	.c + .b {
+		color: green;
+	}
+	/* normal sibling */
+	.b + .c {
+		color: green;
+	}
+	/* not match */
+	.a + .c {
+		color: green;
+	}
+</style>
+
+<div class="a" />
+
+{#each array as item}
+	<div class="b" />
+	<div class="c" />
+{/each}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-else-nested/_config.js b/test/css/samples/siblings-combinator-each-else-nested/_config.js
new file mode 100644
index 0000000000..ab3fac6abe
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else-nested/_config.js
@@ -0,0 +1,144 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				21:
+				22:   /* no match */
+				23:   .a + .c { color: green; }
+				      ^
+				24:   .a + .g { color: green; }
+				25:   .b + .e { color: green; }`,
+			message: 'Unused CSS selector ".a + .c"',
+			pos: 479,
+			start: { character: 479, column: 1, line: 23 },
+			end: { character: 486, column: 8, line: 23 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				22:   /* no match */
+				23:   .a + .c { color: green; }
+				24:   .a + .g { color: green; }
+				      ^
+				25:   .b + .e { color: green; }
+				26:   .c + .g { color: green; }`,
+			message: 'Unused CSS selector ".a + .g"',
+			pos: 506,
+			start: { character: 506, column: 1, line: 24 },
+			end: { character: 513, column: 8, line: 24 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				23:   .a + .c { color: green; }
+				24:   .a + .g { color: green; }
+				25:   .b + .e { color: green; }
+				      ^
+				26:   .c + .g { color: green; }
+				27:   .c + .k { color: green; }`,
+			message: 'Unused CSS selector ".b + .e"',
+			pos: 533,
+			start: { character: 533, column: 1, line: 25 },
+			end: { character: 540, column: 8, line: 25 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				24:   .a + .g { color: green; }
+				25:   .b + .e { color: green; }
+				26:   .c + .g { color: green; }
+				      ^
+				27:   .c + .k { color: green; }
+				28:   .d + .d { color: green; }`,
+			message: 'Unused CSS selector ".c + .g"',
+			pos: 560,
+			start: { character: 560, column: 1, line: 26 },
+			end: { character: 567, column: 8, line: 26 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				25:   .b + .e { color: green; }
+				26:   .c + .g { color: green; }
+				27:   .c + .k { color: green; }
+				      ^
+				28:   .d + .d { color: green; }
+				29:   .e + .f { color: green; }`,
+			message: 'Unused CSS selector ".c + .k"',
+			pos: 587,
+			start: { character: 587, column: 1, line: 27 },
+			end: { character: 594, column: 8, line: 27 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				26:   .c + .g { color: green; }
+				27:   .c + .k { color: green; }
+				28:   .d + .d { color: green; }
+				      ^
+				29:   .e + .f { color: green; }
+				30:   .f + .f { color: green; }`,
+			message: 'Unused CSS selector ".d + .d"',
+			pos: 614,
+			start: { character: 614, column: 1, line: 28 },
+			end: { character: 621, column: 8, line: 28 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				27:   .c + .k { color: green; }
+				28:   .d + .d { color: green; }
+				29:   .e + .f { color: green; }
+				      ^
+				30:   .f + .f { color: green; }
+				31:   .g + .j { color: green; }`,
+			message: 'Unused CSS selector ".e + .f"',
+			pos: 641,
+			start: { character: 641, column: 1, line: 29 },
+			end: { character: 648, column: 8, line: 29 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				28:   .d + .d { color: green; }
+				29:   .e + .f { color: green; }
+				30:   .f + .f { color: green; }
+				      ^
+				31:   .g + .j { color: green; }
+				32:   .g + .h + .i + .j { color: green; }`,
+			message: 'Unused CSS selector ".f + .f"',
+			pos: 668,
+			start: { character: 668, column: 1, line: 30 },
+			end: { character: 675, column: 8, line: 30 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				29:   .e + .f { color: green; }
+				30:   .f + .f { color: green; }
+				31:   .g + .j { color: green; }
+				      ^
+				32:   .g + .h + .i + .j { color: green; }
+				33: </style>`,
+			message: 'Unused CSS selector ".g + .j"',
+			pos: 695,
+			start: { character: 695, column: 1, line: 31 },
+			end: { character: 702, column: 8, line: 31 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				30:   .f + .f { color: green; }
+				31:   .g + .j { color: green; }
+				32:   .g + .h + .i + .j { color: green; }
+				      ^
+				33: </style>
+				34:`,
+			message: 'Unused CSS selector ".g + .h + .i + .j"',
+			pos: 722,
+			start: { character: 722, column: 1, line: 32 },
+			end: { character: 739, column: 18, line: 32 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-each-else-nested/expected.css b/test/css/samples/siblings-combinator-each-else-nested/expected.css
new file mode 100644
index 0000000000..aa4e04081d
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else-nested/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz+.c.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz+.d.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz+.j.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz+.h.svelte-xyz+.j.svelte-xyz{color:green}.g.svelte-xyz+.i.svelte-xyz+.j.svelte-xyz{color:green}.m.svelte-xyz+.m.svelte-xyz.svelte-xyz{color:green}.m.svelte-xyz+.l.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz+.m.svelte-xyz.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-else-nested/expected.html b/test/css/samples/siblings-combinator-each-else-nested/expected.html
new file mode 100644
index 0000000000..5f25a2d38a
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else-nested/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="f svelte-xyz"></div>
+<div class="k"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-else-nested/input.svelte b/test/css/samples/siblings-combinator-each-else-nested/input.svelte
new file mode 100644
index 0000000000..bee9c6b1dc
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else-nested/input.svelte
@@ -0,0 +1,74 @@
+<script>
+	let array = [];
+</script>
+
+<style>
+	.a + .e { color: green; }
+	.a + .f { color: green; }
+	.b + .c { color: green; }
+	.b + .d { color: green; }
+	.c + .e { color: green; }
+	.c + .f { color: green; }
+	.d + .e { color: green; }
+	.d + .f { color: green; }
+	.e + .e { color: green; }
+	.i + .j { color: green; }
+	.g + .h + .j { color: green; }
+	.g + .i + .j { color: green; }
+	.m + .m { color: green; }
+	.m + .l { color: green; }
+	.l + .m { color: green; }
+	
+	/* no match */
+	.a + .c { color: green; }
+	.a + .g { color: green; }
+	.b + .e { color: green; }
+	.c + .g { color: green; }
+	.c + .k { color: green; }
+	.d + .d { color: green; }
+	.e + .f { color: green; }
+	.f + .f { color: green; }
+	.g + .j { color: green; }
+	.g + .h + .i + .j { color: green; }
+</style>
+
+<div class="a" />
+
+{#each array as a}
+	<div class="b" />
+	{#each array as b}
+		<div class="c" />
+	{:else}
+		<div class="d" />
+	{/each}
+{/each}
+
+{#each array as c}
+	{#each array as d}
+		<div class="e" />
+	{/each}
+{:else}
+	<div class="f" />
+{/each}
+
+{#each array as item}
+	<div class="g" />
+	{#each array as item}
+		{#each array as item}
+			<div class="h" />
+		{/each}
+	{:else}
+		<div class="i" />
+	{/each}
+	<div class="j" />
+{/each}
+
+<div class="k" />
+
+{#each array as item}
+	{#each array as item}
+		<div class="l" />
+	{:else}
+		<div class="m" />
+	{/each}
+{/each}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-else/_config.js b/test/css/samples/siblings-combinator-each-else/_config.js
new file mode 100644
index 0000000000..fcd961d5fe
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else/_config.js
@@ -0,0 +1,32 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				10:
+				11:   /* no match */
+				12:   .a + .d { color: green; }
+				      ^
+				13:   .b + .c { color: green; }
+				14: </style>`,
+			message: 'Unused CSS selector ".a + .d"',
+			pos: 172,
+			start: { character: 172, column: 1, line: 12 },
+			end: { character: 179, column: 8, line: 12 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				11:   /* no match */
+				12:   .a + .d { color: green; }
+				13:   .b + .c { color: green; }
+				      ^
+				14: </style>
+				15:`,
+			message: 'Unused CSS selector ".b + .c"',
+			pos: 199,
+			start: { character: 199, column: 1, line: 13 },
+			end: { character: 206, column: 8, line: 13 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-each-else/expected.css b/test/css/samples/siblings-combinator-each-else/expected.css
new file mode 100644
index 0000000000..f82bca8215
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.b.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz{color:green}.b.svelte-xyz+.d.svelte-xyz{color:green}.c.svelte-xyz+.d.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-else/expected.html b/test/css/samples/siblings-combinator-each-else/expected.html
new file mode 100644
index 0000000000..fb838a55fd
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-else/input.svelte b/test/css/samples/siblings-combinator-each-else/input.svelte
new file mode 100644
index 0000000000..ecd48968c2
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-else/input.svelte
@@ -0,0 +1,24 @@
+<script>
+	let array = [];
+</script>
+
+<style>
+	.a + .b { color: green; }
+	.a + .c { color: green; }
+	.b + .d { color: green; }
+	.c + .d { color: green; }
+	
+	/* no match */
+	.a + .d { color: green; }
+	.b + .c { color: green; }
+</style>
+
+<div class="a" />
+
+{#each array as item}
+	<div class="b" />
+{:else}
+	<div class="c" />
+{/each}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-nested/_config.js b/test/css/samples/siblings-combinator-each-nested/_config.js
new file mode 100644
index 0000000000..ce9c46fb06
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-nested/_config.js
@@ -0,0 +1,116 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				56:
+				57:   /* no match */
+				58:   .a + .h { color: green; }
+				      ^
+				59:   .a + .i { color: green; }
+				60:   .c + .h { color: green; }`,
+			message: 'Unused CSS selector ".a + .h"',
+			pos: 1229,
+			start: { character: 1229, column: 1, line: 58 },
+			end: { character: 1236, column: 8, line: 58 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				57:   /* no match */
+				58:   .a + .h { color: green; }
+				59:   .a + .i { color: green; }
+				      ^
+				60:   .c + .h { color: green; }
+				61:   .c + .i { color: green; }`,
+			message: 'Unused CSS selector ".a + .i"',
+			pos: 1256,
+			start: { character: 1256, column: 1, line: 59 },
+			end: { character: 1263, column: 8, line: 59 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				58:   .a + .h { color: green; }
+				59:   .a + .i { color: green; }
+				60:   .c + .h { color: green; }
+				      ^
+				61:   .c + .i { color: green; }
+				62:   .d + .f { color: green; }`,
+			message: 'Unused CSS selector ".c + .h"',
+			pos: 1283,
+			start: { character: 1283, column: 1, line: 60 },
+			end: { character: 1290, column: 8, line: 60 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				59:   .a + .i { color: green; }
+				60:   .c + .h { color: green; }
+				61:   .c + .i { color: green; }
+				      ^
+				62:   .d + .f { color: green; }
+				63:   .d + .g { color: green; }`,
+			message: 'Unused CSS selector ".c + .i"',
+			pos: 1310,
+			start: { character: 1310, column: 1, line: 61 },
+			end: { character: 1317, column: 8, line: 61 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				60:   .c + .h { color: green; }
+				61:   .c + .i { color: green; }
+				62:   .d + .f { color: green; }
+				      ^
+				63:   .d + .g { color: green; }
+				64:   .e + .g { color: green; }`,
+			message: 'Unused CSS selector ".d + .f"',
+			pos: 1337,
+			start: { character: 1337, column: 1, line: 62 },
+			end: { character: 1344, column: 8, line: 62 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				61:   .c + .i { color: green; }
+				62:   .d + .f { color: green; }
+				63:   .d + .g { color: green; }
+				      ^
+				64:   .e + .g { color: green; }
+				65:   .g + .i { color: green; }`,
+			message: 'Unused CSS selector ".d + .g"',
+			pos: 1364,
+			start: { character: 1364, column: 1, line: 63 },
+			end: { character: 1371, column: 8, line: 63 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				62:   .d + .f { color: green; }
+				63:   .d + .g { color: green; }
+				64:   .e + .g { color: green; }
+				      ^
+				65:   .g + .i { color: green; }
+				66: </style>`,
+			message: 'Unused CSS selector ".e + .g"',
+			pos: 1391,
+			start: { character: 1391, column: 1, line: 64 },
+			end: { character: 1398, column: 8, line: 64 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				63:   .d + .g { color: green; }
+				64:   .e + .g { color: green; }
+				65:   .g + .i { color: green; }
+				      ^
+				66: </style>
+				67:`,
+			message: 'Unused CSS selector ".g + .i"',
+			pos: 1418,
+			start: { character: 1418, column: 1, line: 65 },
+			end: { character: 1425, column: 8, line: 65 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-each-nested/expected.css b/test/css/samples/siblings-combinator-each-nested/expected.css
new file mode 100644
index 0000000000..616d739670
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-nested/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.d.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.g.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.d.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.g.svelte-xyz.svelte-xyz{color:green}.j.svelte-xyz+.m.svelte-xyz.svelte-xyz{color:green}.j.svelte-xyz+.n.svelte-xyz.svelte-xyz{color:green}.j.svelte-xyz+.o.svelte-xyz.svelte-xyz{color:green}.k.svelte-xyz+.m.svelte-xyz.svelte-xyz{color:green}.k.svelte-xyz+.n.svelte-xyz.svelte-xyz{color:green}.k.svelte-xyz+.o.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz+.m.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz+.n.svelte-xyz.svelte-xyz{color:green}.l.svelte-xyz+.o.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz+.h.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz+.d.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.h.svelte-xyz+.g.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz+.h.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz+.g.svelte-xyz.svelte-xyz{color:green}.d.svelte-xyz+.d.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz+.e.svelte-xyz.svelte-xyz{color:green}.f.svelte-xyz+.f.svelte-xyz.svelte-xyz{color:green}.g.svelte-xyz+.g.svelte-xyz.svelte-xyz{color:green}.h.svelte-xyz+.h.svelte-xyz.svelte-xyz{color:green}.i.svelte-xyz+.i.svelte-xyz.svelte-xyz{color:green}.e.svelte-xyz+.e.svelte-xyz+.f.svelte-xyz{color:green}.e.svelte-xyz+.e.svelte-xyz+.d.svelte-xyz{color:green}.h.svelte-xyz+.h.svelte-xyz+.i.svelte-xyz{color:green}.h.svelte-xyz+.h.svelte-xyz+.g.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-nested/expected.html b/test/css/samples/siblings-combinator-each-nested/expected.html
new file mode 100644
index 0000000000..340d6fc4c8
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-nested/expected.html
@@ -0,0 +1,15 @@
+<div class="a svelte-xyz"></div>
+<div class="b"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
+<div class="e svelte-xyz"></div>
+<div class="f svelte-xyz"></div>
+<div class="g svelte-xyz"></div>
+<div class="h svelte-xyz"></div>
+<div class="i svelte-xyz"></div>
+<div class="j svelte-xyz"></div>
+<div class="k svelte-xyz"></div>
+<div class="l svelte-xyz"></div>
+<div class="m svelte-xyz"></div>
+<div class="n svelte-xyz"></div>
+<div class="o svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each-nested/input.svelte b/test/css/samples/siblings-combinator-each-nested/input.svelte
new file mode 100644
index 0000000000..b5b9242675
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each-nested/input.svelte
@@ -0,0 +1,113 @@
+<script>
+	let array = [1];
+</script>
+
+<style>
+	/* boundary of each */
+	.a + .d { color: green; }
+	.a + .e { color: green; }
+	.a + .f { color: green; }
+	.a + .g { color: green; }
+	.c + .d { color: green; }
+	.c + .e { color: green; }
+	.c + .f { color: green; }
+	.c + .g { color: green; }
+
+	/* nested boundary of each */
+	.j + .m { color: green; }
+	.j + .n { color: green; }
+	.j + .o { color: green; }
+	.k + .m { color: green; }
+	.k + .n { color: green; }
+	.k + .o { color: green; }
+	.l + .m { color: green; }
+	.l + .n { color: green; }
+	.l + .o { color: green; }
+
+	/* parent each */
+	.d + .e { color: green; }
+	.e + .f { color: green; }
+
+	/* child each */
+	.g + .h { color: green; }
+
+	/* wrap around */
+	.f + .d { color: green; }
+	.f + .e { color: green; }
+	.f + .f { color: green; }
+
+	.h + .g { color: green; }
+	.i + .h { color: green; }
+	.i + .g { color: green; }
+
+	/* wrap around self */
+	.d + .d { color: green; }
+	.e + .e { color: green; }
+	.f + .f { color: green; }
+	.g + .g { color: green; }
+	.h + .h { color: green; }
+	.i + .i { color: green; }
+
+	/* wrap around self + next */
+	.e + .e + .f { color: green; }
+	.e + .e + .d { color: green; }
+	.h + .h + .i { color: green; }
+	.h + .h + .g { color: green; }
+
+	/* no match */
+	.a + .h { color: green; }
+	.a + .i { color: green; }
+	.c + .h { color: green; }
+	.c + .i { color: green; }
+	.d + .f { color: green; }
+	.d + .g { color: green; }
+	.e + .g { color: green; }
+	.g + .i { color: green; }
+</style>
+
+<div class="a" />
+
+{#each array as item}
+	<div class="b" />
+	<div class="c" />
+{/each}
+
+{#each array as item}
+	{#each array as item}
+		{#each array as item}
+			<div class="d" />
+		{/each}
+		<div class="e" />
+	{/each}
+	<div class="f" />
+{/each}
+
+{#each array as item}
+	<div class="g" />
+	{#each array as item}
+		<div class="h" />
+		{#each array as item}
+			<div class="i" />
+		{/each}
+	{/each}
+{/each}
+
+{#each array as item}
+	<div class="j" />
+	{#each array as item}
+		<div class="k" />
+		{#each array as item}
+			<div class="l" />
+		{/each}
+	{/each}
+{/each}
+
+{#each array as item}
+	{#each array as item}
+		{#each array as item}
+			<div class="m" />
+		{/each}
+		<div class="n" />
+	{/each}
+	<div class="o" />
+{/each}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each/expected.css b/test/css/samples/siblings-combinator-each/expected.css
new file mode 100644
index 0000000000..a46fc4ed4e
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each/expected.css
@@ -0,0 +1 @@
+div.svelte-xyz+span.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-each/expected.html b/test/css/samples/siblings-combinator-each/expected.html
new file mode 100644
index 0000000000..9d0416f01b
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each/expected.html
@@ -0,0 +1,6 @@
+<div class="svelte-xyz"></div>
+<span class="each svelte-xyz"></span>
+<div class="each svelte-xyz"></div>
+<span class="each svelte-xyz"></span>
+<div class="each svelte-xyz"></div>
+<span class="svelte-xyz"></span>
diff --git a/test/css/samples/siblings-combinator-each/input.svelte b/test/css/samples/siblings-combinator-each/input.svelte
new file mode 100644
index 0000000000..de77a25180
--- /dev/null
+++ b/test/css/samples/siblings-combinator-each/input.svelte
@@ -0,0 +1,20 @@
+<script>
+	let array = [1];
+</script>
+
+<style>
+	div + span {
+		color: green;
+	}
+</style>
+
+<div />
+
+{#each array as item}
+	<span class="each" />
+	<div class="each" />
+	<span class="each" />
+	<div class="each" />
+{/each}
+
+<span />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/_config.js b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/_config.js
new file mode 100644
index 0000000000..0155bf0cf1
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				16:
+				17:   /* no match */
+				18:   .b + .c { color: green; }
+				      ^
+				19: </style>
+				20:`,
+			message: 'Unused CSS selector ".b + .c"',
+			pos: 319,
+			start: { character: 319, column: 1, line: 18 },
+			end: { character: 326, column: 8, line: 18 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/expected.css b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/expected.css
new file mode 100644
index 0000000000..93cd539f00
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.b.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.b.svelte-xyz+.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.d.svelte-xyz.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz+.c.svelte-xyz.svelte-xyz{color:green}.c.svelte-xyz+.c.svelte-xyz+.d.svelte-xyz.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz+.c.svelte-xyz+.d.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/expected.html b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/expected.html
new file mode 100644
index 0000000000..fb838a55fd
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="c svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/input.svelte b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/input.svelte
new file mode 100644
index 0000000000..ff9f10dc1c
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive-with-each/input.svelte
@@ -0,0 +1,31 @@
+<script>
+	let foo = false;
+	let array = [1];
+</script>
+
+<style>
+	.a + .b { color: green; }
+	.a + .c { color: green; }
+	.a + .d { color: green; }
+	.b + .d { color: green; }
+	.c + .d { color: green; }
+
+	.a + .c + .c { color: green; }
+	.c + .c + .d { color: green; }
+	.a + .c + .c + .d { color: green; }
+
+	/* no match */
+	.b + .c { color: green; }
+</style>
+
+<div class="a" />
+
+{#if foo}
+	<div class="b" />
+{:else}
+	{#each array as item}
+		<div class="c" />
+	{/each}
+{/if}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive/_config.js b/test/css/samples/siblings-combinator-if-not-exhaustive/_config.js
new file mode 100644
index 0000000000..e01c358eff
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				12:
+				13:   /* no match */
+				14:   .b + .c { color: green; }
+				      ^
+				15: </style>
+				16:`,
+			message: 'Unused CSS selector ".b + .c"',
+			pos: 215,
+			start: { character: 215, column: 1, line: 14 },
+			end: { character: 222, column: 8, line: 14 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive/expected.css b/test/css/samples/siblings-combinator-if-not-exhaustive/expected.css
new file mode 100644
index 0000000000..b1225e36a1
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.b.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz{color:green}.a.svelte-xyz+.d.svelte-xyz{color:green}.b.svelte-xyz+.d.svelte-xyz{color:green}.c.svelte-xyz+.d.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive/expected.html b/test/css/samples/siblings-combinator-if-not-exhaustive/expected.html
new file mode 100644
index 0000000000..813e778dc6
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="d svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if-not-exhaustive/input.svelte b/test/css/samples/siblings-combinator-if-not-exhaustive/input.svelte
new file mode 100644
index 0000000000..4f832b3b47
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if-not-exhaustive/input.svelte
@@ -0,0 +1,25 @@
+<script>
+	let foo = true;
+	let bar = true;
+</script>
+
+<style>
+	.a + .b { color: green; }
+	.a + .c { color: green; }
+	.a + .d { color: green; }
+	.b + .d { color: green; }
+	.c + .d { color: green; }
+
+	/* no match */
+	.b + .c { color: green; }
+</style>
+
+<div class="a" />
+
+{#if foo}
+	<div class="b" />
+{:else if bar}
+	<div class="c" />
+{/if}
+
+<div class="d" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if/_config.js b/test/css/samples/siblings-combinator-if/_config.js
new file mode 100644
index 0000000000..c2396f08ef
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if/_config.js
@@ -0,0 +1,60 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				13:
+				14:   /* no match */
+				15:   .a + .e { color: green; }
+				      ^
+				16:   .b + .c { color: green; }
+				17:   .b + .d { color: green; }`,
+			message: 'Unused CSS selector ".a + .e"',
+			pos: 242,
+			start: { character: 242, column: 1, line: 15 },
+			end: { character: 249, column: 8, line: 15 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				14:   /* no match */
+				15:   .a + .e { color: green; }
+				16:   .b + .c { color: green; }
+				      ^
+				17:   .b + .d { color: green; }
+				18:   .c + .d { color: green; }`,
+			message: 'Unused CSS selector ".b + .c"',
+			pos: 269,
+			start: { character: 269, column: 1, line: 16 },
+			end: { character: 276, column: 8, line: 16 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				15:   .a + .e { color: green; }
+				16:   .b + .c { color: green; }
+				17:   .b + .d { color: green; }
+				      ^
+				18:   .c + .d { color: green; }
+				19: </style>`,
+			message: 'Unused CSS selector ".b + .d"',
+			pos: 296,
+			start: { character: 296, column: 1, line: 17 },
+			end: { character: 303, column: 8, line: 17 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				16:   .b + .c { color: green; }
+				17:   .b + .d { color: green; }
+				18:   .c + .d { color: green; }
+				      ^
+				19: </style>
+				20:`,
+			message: 'Unused CSS selector ".c + .d"',
+			pos: 323,
+			start: { character: 323, column: 1, line: 18 },
+			end: { character: 330, column: 8, line: 18 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-if/expected.css b/test/css/samples/siblings-combinator-if/expected.css
new file mode 100644
index 0000000000..5ea39be7c2
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if/expected.css
@@ -0,0 +1 @@
+.a.svelte-xyz+.b.svelte-xyz{color:green}.a.svelte-xyz+.c.svelte-xyz{color:green}.a.svelte-xyz+.d.svelte-xyz{color:green}.b.svelte-xyz+.e.svelte-xyz{color:green}.c.svelte-xyz+.e.svelte-xyz{color:green}.d.svelte-xyz+.e.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if/expected.html b/test/css/samples/siblings-combinator-if/expected.html
new file mode 100644
index 0000000000..3d8ac9f966
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if/expected.html
@@ -0,0 +1,3 @@
+<div class="a svelte-xyz"></div>
+<div class="b svelte-xyz"></div>
+<div class="e svelte-xyz"></div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-if/input.svelte b/test/css/samples/siblings-combinator-if/input.svelte
new file mode 100644
index 0000000000..6cfc436876
--- /dev/null
+++ b/test/css/samples/siblings-combinator-if/input.svelte
@@ -0,0 +1,31 @@
+<script>
+	let foo = true;
+	let bar = true;
+</script>
+
+<style>
+	.a + .b { color: green; }
+	.a + .c { color: green; }
+	.a + .d { color: green; }
+	.b + .e { color: green; }
+	.c + .e { color: green; }
+	.d + .e { color: green; }
+
+	/* no match */
+	.a + .e { color: green; }
+	.b + .c { color: green; }
+	.b + .d { color: green; }
+	.c + .d { color: green; }
+</style>
+
+<div class="a" />
+
+{#if foo}
+	<div class="b" />
+{:else if bar}
+	<div class="c" />
+{:else}
+	<div class="d" />
+{/if}
+
+<div class="e" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-slot/_config.js b/test/css/samples/siblings-combinator-slot/_config.js
new file mode 100644
index 0000000000..c0a00500d4
--- /dev/null
+++ b/test/css/samples/siblings-combinator-slot/_config.js
@@ -0,0 +1,46 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				 7:
+				 8:   /* no match */
+				 9:   .a + .b { color: green; }
+				      ^
+				10:   .b + .c { color: green; }
+				11:   .c + .f { color: green; }`,
+			message: 'Unused CSS selector ".a + .b"',
+			pos: 84,
+			start: { character: 84, column: 1, line: 9 },
+			end: { character: 91, column: 8, line: 9 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				 8:   /* no match */
+				 9:   .a + .b { color: green; }
+				10:   .b + .c { color: green; }
+				      ^
+				11:   .c + .f { color: green; }
+				12: </style>`,
+			message: 'Unused CSS selector ".b + .c"',
+			pos: 111,
+			start: { character: 111, column: 1, line: 10 },
+			end: { character: 118, column: 8, line: 10 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				 9:   .a + .b { color: green; }
+				10:   .b + .c { color: green; }
+				11:   .c + .f { color: green; }
+				      ^
+				12: </style>
+				13:`,
+			message: 'Unused CSS selector ".c + .f"',
+			pos: 138,
+			start: { character: 138, column: 1, line: 11 },
+			end: { character: 145, column: 8, line: 11 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-slot/expected.css b/test/css/samples/siblings-combinator-slot/expected.css
new file mode 100644
index 0000000000..bbdd03f274
--- /dev/null
+++ b/test/css/samples/siblings-combinator-slot/expected.css
@@ -0,0 +1 @@
+.d.svelte-xyz+.e.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-slot/input.svelte b/test/css/samples/siblings-combinator-slot/input.svelte
new file mode 100644
index 0000000000..42fe0e4c30
--- /dev/null
+++ b/test/css/samples/siblings-combinator-slot/input.svelte
@@ -0,0 +1,24 @@
+<script>
+	let App;
+</script>
+
+<style>
+	.d + .e { color: green; }
+	
+	/* no match */
+	.a + .b { color: green; }
+	.b + .c { color: green; }
+	.c + .f { color: green; }
+</style>
+
+<div class="a" />
+<App>
+	<div class="b" slot="a" />
+
+	<div class="c" slot="b">
+		<div class="d" />
+		<div class="e" />
+	</div>
+</App>
+
+<div class="f" />
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-star/_config.js b/test/css/samples/siblings-combinator-star/_config.js
new file mode 100644
index 0000000000..32ff416981
--- /dev/null
+++ b/test/css/samples/siblings-combinator-star/_config.js
@@ -0,0 +1,18 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				3:     margin-left: 4px;
+				4:   }
+				5:   .not-match > * + * {
+				     ^
+				6:     margin-left: 4px;
+				7:   }`,
+			message: 'Unused CSS selector ".not-match > * + *"',
+			pos: 50,
+			start: { character: 50, column: 1, line: 5 },
+      end: { character: 68, column: 19, line: 5 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator-star/expected.css b/test/css/samples/siblings-combinator-star/expected.css
new file mode 100644
index 0000000000..c1a06945f9
--- /dev/null
+++ b/test/css/samples/siblings-combinator-star/expected.css
@@ -0,0 +1 @@
+.match.svelte-xyz>.svelte-xyz+.svelte-xyz{margin-left:4px}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-star/expected.html b/test/css/samples/siblings-combinator-star/expected.html
new file mode 100644
index 0000000000..1cfae6e6f7
--- /dev/null
+++ b/test/css/samples/siblings-combinator-star/expected.html
@@ -0,0 +1,7 @@
+<div class="not-match">
+  <div></div>
+</div>
+<div class="match svelte-xyz">
+  <div class="svelte-xyz"></div>
+  <div class="svelte-xyz"></div>
+</div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator-star/input.svelte b/test/css/samples/siblings-combinator-star/input.svelte
new file mode 100644
index 0000000000..ca837f2239
--- /dev/null
+++ b/test/css/samples/siblings-combinator-star/input.svelte
@@ -0,0 +1,17 @@
+<style>
+	.match > * + * {
+		margin-left: 4px;
+	}
+	.not-match > * + * {
+		margin-left: 4px;
+	}
+</style>
+
+<div class="not-match">
+	<div />
+</div>
+
+<div class="match">
+	<div />
+	<div />
+</div>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator/_config.js b/test/css/samples/siblings-combinator/_config.js
new file mode 100644
index 0000000000..2285b5a837
--- /dev/null
+++ b/test/css/samples/siblings-combinator/_config.js
@@ -0,0 +1,62 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			frame: `
+				3:     color: green;
+				4:   }
+				5:   article + div {
+				     ^
+				6:     color: green;
+				7:   }`,
+			message: 'Unused CSS selector "article + div"',
+			pos: 45,
+			start: { character: 45, column: 1, line: 5 },
+			end: { character: 58, column: 14, line: 5 }
+		},
+		{
+			code: "css-unused-selector",
+			
+			frame:`
+				 6:     color: green;
+				 7:   }
+				 8:   span + article {
+				      ^
+				 9:     color: green;
+				10:   }`,
+			message: 'Unused CSS selector "span + article"',
+			pos: 81,
+			start: { character: 81, column: 1, line: 8 },
+			end: { character: 95, column: 15, line: 8 }
+		},
+		{
+			code: "css-unused-selector",
+			
+			frame: `
+				 9:     color: green;
+				10:   }
+				11:   b + article {
+				      ^
+				12:     color: green;
+				13:   }`,
+			message: 'Unused CSS selector "b + article"',
+			pos: 118,
+			start: { character: 118, column: 1, line: 11 },
+			end: { character: 129, column: 12, line: 11 }
+		},
+		{
+			code: "css-unused-selector",
+			frame: `
+				12:     color: green;
+				13:   }
+				14:   span + div {
+				      ^
+				15:     color: green;
+				16:   }`,
+			message: 'Unused CSS selector "span + div"',
+			pos: 152,
+			start: { character: 152, column: 1, line: 14 },
+			end: { character: 162, column: 11, line: 14 }
+		}
+	]
+};
diff --git a/test/css/samples/siblings-combinator/expected.css b/test/css/samples/siblings-combinator/expected.css
new file mode 100644
index 0000000000..be01048cf1
--- /dev/null
+++ b/test/css/samples/siblings-combinator/expected.css
@@ -0,0 +1 @@
+div.svelte-xyz+article.svelte-xyz.svelte-xyz{color:green}span.svelte-xyz+b.svelte-xyz.svelte-xyz{color:green}div.svelte-xyz span.svelte-xyz+b.svelte-xyz{color:green}.a.svelte-xyz+article.svelte-xyz.svelte-xyz{color:green}div.svelte-xyz+.b.svelte-xyz.svelte-xyz{color:green}
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator/expected.html b/test/css/samples/siblings-combinator/expected.html
new file mode 100644
index 0000000000..f4692365dd
--- /dev/null
+++ b/test/css/samples/siblings-combinator/expected.html
@@ -0,0 +1,5 @@
+<div class="a svelte-xyz">
+  <span class="svelte-xyz"></span>
+  <b class="svelte-xyz"></b>
+</div>
+<article class="b svelte-xyz"></article>
\ No newline at end of file
diff --git a/test/css/samples/siblings-combinator/input.svelte b/test/css/samples/siblings-combinator/input.svelte
new file mode 100644
index 0000000000..3e22076d52
--- /dev/null
+++ b/test/css/samples/siblings-combinator/input.svelte
@@ -0,0 +1,35 @@
+<style>
+	div + article {
+		color: green;
+	}
+	article + div {
+		color: green;
+	}
+	span + article {
+		color: green;
+	}
+	b + article {
+		color: green;
+	}
+	span + div {
+		color: green;
+	}
+	span + b {
+		color: green;
+	}
+	div span + b {
+		color: green;
+	}
+	.a + article {
+		color: green;
+	}
+	div + .b {
+		color: green;
+	}
+</style>
+
+<div class="a">
+	<span />
+	<b />
+</div>
+<article class="b"></article>
\ No newline at end of file
diff --git a/test/css/samples/unused-selector-child-combinator/_config.js b/test/css/samples/unused-selector-child-combinator/_config.js
new file mode 100644
index 0000000000..becf382147
--- /dev/null
+++ b/test/css/samples/unused-selector-child-combinator/_config.js
@@ -0,0 +1,45 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			message: 'Unused CSS selector "article > *"',
+			frame: `
+			1: <style>
+			2:   article > * {
+			     ^
+			3:     font-size: 36px;
+			4:   }`,
+			pos: 10,
+			start: { character: 10, column: 1, line: 2 },
+			end: { character: 21, column: 12, line: 2 }
+		},
+		{
+			code: "css-unused-selector",
+			message: 'Unused CSS selector "article *"',
+			frame: `
+			4:   }
+			5:
+			6:   article * {
+			     ^
+			7:     font-size: 36px;
+			8:   }`,
+			pos: 49,
+			start: { character: 49, column: 1, line: 6 },
+			end: { character: 58, column: 10, line: 6 }
+		},
+		{
+			code: "css-unused-selector",
+			message: 'Unused CSS selector ".article > *"',
+			frame: `
+			 8:   }
+			 9:
+			10:   .article > * {
+			      ^
+			11:     font-size: 48px;
+			12:   }`,
+			pos: 86,
+			start: { character: 86, column: 1, line: 10 },
+			end: { character: 98, column: 13, line: 10 }
+		}
+	]
+};
diff --git a/test/css/samples/unused-selector-child-combinator/expected.css b/test/css/samples/unused-selector-child-combinator/expected.css
new file mode 100644
index 0000000000..68b778844f
--- /dev/null
+++ b/test/css/samples/unused-selector-child-combinator/expected.css
@@ -0,0 +1 @@
+div.svelte-xyz>.svelte-xyz{color:orange}
\ No newline at end of file
diff --git a/test/css/samples/unused-selector-child-combinator/input.svelte b/test/css/samples/unused-selector-child-combinator/input.svelte
new file mode 100644
index 0000000000..33a27e0465
--- /dev/null
+++ b/test/css/samples/unused-selector-child-combinator/input.svelte
@@ -0,0 +1,23 @@
+<style>	
+	article > * {
+		font-size: 36px;
+  }
+
+	article * {
+		font-size: 36px;
+	}
+	
+	.article > * {
+		font-size: 48px;
+	}
+	
+	div > * {
+		color: orange;
+	}
+</style>
+
+<div>
+	<p>
+		Svelte REPLs are svelte.
+	</p>
+</div>
\ No newline at end of file
diff --git a/test/js/samples/event-modifiers/expected.js b/test/js/samples/event-modifiers/expected.js
index 6aa3c161f9..3901753661 100644
--- a/test/js/samples/event-modifiers/expected.js
+++ b/test/js/samples/event-modifiers/expected.js
@@ -16,41 +16,49 @@ import {
 } from "svelte/internal";
 
 function create_fragment(ctx) {
-	let div;
-	let button0;
+	let div1;
+	let div0;
 	let t1;
-	let button1;
+	let button0;
 	let t3;
+	let button1;
+	let t5;
 	let button2;
 	let mounted;
 	let dispose;
 
 	return {
 		c() {
-			div = element("div");
+			div1 = element("div");
+			div0 = element("div");
+			div0.textContent = "touch me";
+			t1 = space();
 			button0 = element("button");
 			button0.textContent = "click me";
-			t1 = space();
+			t3 = space();
 			button1 = element("button");
 			button1.textContent = "or me";
-			t3 = space();
+			t5 = space();
 			button2 = element("button");
 			button2.textContent = "or me!";
 		},
 		m(target, anchor) {
-			insert(target, div, anchor);
-			append(div, button0);
-			append(div, t1);
-			append(div, button1);
-			append(div, t3);
-			append(div, button2);
+			insert(target, div1, anchor);
+			append(div1, div0);
+			append(div1, t1);
+			append(div1, button0);
+			append(div1, t3);
+			append(div1, button1);
+			append(div1, t5);
+			append(div1, button2);
 
 			if (!mounted) {
 				dispose = [
+					listen(div0, "touchstart", handleTouchstart, { passive: false }),
 					listen(button0, "click", stop_propagation(prevent_default(handleClick))),
 					listen(button1, "click", handleClick, { once: true, capture: true }),
 					listen(button2, "click", handleClick, true),
-					listen(div, "touchstart", handleTouchstart, { passive: true })
+					listen(div1, "touchstart", handleTouchstart, { passive: true })
 				];
 
 				mounted = true;
@@ -60,7 +68,7 @@ function create_fragment(ctx) {
 		i: noop,
 		o: noop,
 		d(detaching) {
-			if (detaching) detach(div);
+			if (detaching) detach(div1);
 			mounted = false;
 			run_all(dispose);
 		}
diff --git a/test/js/samples/event-modifiers/input.svelte b/test/js/samples/event-modifiers/input.svelte
index 225134f598..c72d58dabb 100644
--- a/test/js/samples/event-modifiers/input.svelte
+++ b/test/js/samples/event-modifiers/input.svelte
@@ -9,6 +9,7 @@
 </script>
 
 <div on:touchstart={handleTouchstart}>
+	<div on:touchstart|nonpassive={handleTouchstart}>touch me</div>
 	<button on:click|stopPropagation|preventDefault={handleClick}>click me</button>
 	<button on:click|once|capture={handleClick}>or me</button>
 	<button on:click|capture={handleClick}>or me!</button>
diff --git a/test/js/samples/import-meta/expected.js b/test/js/samples/import-meta/expected.js
new file mode 100644
index 0000000000..ba77398321
--- /dev/null
+++ b/test/js/samples/import-meta/expected.js
@@ -0,0 +1,53 @@
+/* generated by Svelte vX.Y.Z */
+import {
+	SvelteComponent,
+	detach,
+	init,
+	insert,
+	noop,
+	safe_not_equal,
+	space,
+	text
+} from "svelte/internal";
+
+function create_fragment(ctx) {
+	let t0;
+	let t1;
+	let t2_value = import.meta.url + "";
+	let t2;
+
+	return {
+		c() {
+			t0 = text(/*url*/ ctx[0]);
+			t1 = space();
+			t2 = text(t2_value);
+		},
+		m(target, anchor) {
+			insert(target, t0, anchor);
+			insert(target, t1, anchor);
+			insert(target, t2, anchor);
+		},
+		p: noop,
+		i: noop,
+		o: noop,
+		d(detaching) {
+			if (detaching) detach(t0);
+			if (detaching) detach(t1);
+			if (detaching) detach(t2);
+		}
+	};
+}
+
+function instance($$self) {
+	const url = import.meta.url;
+	return [url];
+}
+
+class Component extends SvelteComponent {
+	constructor(options) {
+		super();
+		init(this, options, instance, create_fragment, safe_not_equal, {});
+	}
+}
+
+export default Component;
\ No newline at end of file
diff --git a/test/js/samples/import-meta/input.svelte b/test/js/samples/import-meta/input.svelte
new file mode 100644
index 0000000000..a5ce32dd77
--- /dev/null
+++ b/test/js/samples/import-meta/input.svelte
@@ -0,0 +1,6 @@
+<script>
+	const url = import.meta.url;
+</script>
+
+{url}
+{import.meta.url}
diff --git a/test/runtime/samples/action-object/_config.js b/test/runtime/samples/action-object/_config.js
new file mode 100644
index 0000000000..7fdc11af2b
--- /dev/null
+++ b/test/runtime/samples/action-object/_config.js
@@ -0,0 +1,8 @@
+export default {
+	html: `
+		<button>action</button>
+	`,
+	async test({ assert, target, window }) {
+		assert.equal(target.querySelector('button').foo, 'bar1337');
+	}
+};
diff --git a/test/runtime/samples/action-object/main.svelte b/test/runtime/samples/action-object/main.svelte
new file mode 100644
index 0000000000..f15e319e6f
--- /dev/null
+++ b/test/runtime/samples/action-object/main.svelte
@@ -0,0 +1,10 @@
+<script>
+	const obj = {
+		foo : "bar",
+		action(element, { leet }) {
+			element.foo = this.foo + leet;
+		},
+	}
+</script>
+
+<button use:obj.action={{ leet: 1337 }}>action</button>
\ No newline at end of file
diff --git a/test/runtime/samples/await-without-catch/_config.js b/test/runtime/samples/await-without-catch/_config.js
index 2030ed7949..1b7da5c0be 100644
--- a/test/runtime/samples/await-without-catch/_config.js
+++ b/test/runtime/samples/await-without-catch/_config.js
@@ -39,6 +39,7 @@ export default {
 		})
 		.catch((err) => {
 			assert.equal(err.message, 'this error should be thrown');
+			assert.htmlEqual(target.innerHTML, '');
 		});
 	}
 };
\ No newline at end of file
diff --git a/test/runtime/samples/each-block-keyed-dyanmic-key/_config.js b/test/runtime/samples/each-block-keyed-dyanmic-key/_config.js
new file mode 100644
index 0000000000..0aed1b0e07
--- /dev/null
+++ b/test/runtime/samples/each-block-keyed-dyanmic-key/_config.js
@@ -0,0 +1,27 @@
+let count = 0;
+let value = 'foo';
+
+export default {
+	props: {
+		value() {
+			count++;
+			return value;
+		}
+	},
+
+	html: `
+		<div>foo</div>
+		<div>foo</div>
+	`,
+
+	test({ assert, component, target }) {
+		value = 'bar';
+		component.id = 1;
+
+		assert.equal(count, 4);
+		assert.htmlEqual(target.innerHTML, `
+			<div>bar</div>
+			<div>bar</div>
+		`);
+	}
+};
diff --git a/test/runtime/samples/each-block-keyed-dyanmic-key/main.svelte b/test/runtime/samples/each-block-keyed-dyanmic-key/main.svelte
new file mode 100644
index 0000000000..9a15c7d98e
--- /dev/null
+++ b/test/runtime/samples/each-block-keyed-dyanmic-key/main.svelte
@@ -0,0 +1,8 @@
+<script>
+	export let id = 0;
+	export let value;
+</script>
+
+{#each ['foo', 'bar'] as key (id + key)}
+	<div>{value()}</div>
+{/each}
\ No newline at end of file
diff --git a/test/runtime/samples/numeric-seperator/_config.js b/test/runtime/samples/numeric-seperator/_config.js
new file mode 100644
index 0000000000..bc6d7c04f3
--- /dev/null
+++ b/test/runtime/samples/numeric-seperator/_config.js
@@ -0,0 +1,3 @@
+export default {
+	html: `2048 2048`
+};
diff --git a/test/runtime/samples/numeric-seperator/main.svelte b/test/runtime/samples/numeric-seperator/main.svelte
new file mode 100644
index 0000000000..e491b8a107
--- /dev/null
+++ b/test/runtime/samples/numeric-seperator/main.svelte
@@ -0,0 +1,5 @@
+<script>
+	const num = 2_048;
+</script>
+
+{num} {2_048}
\ No newline at end of file
diff --git a/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store-2/_config.js b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store-2/_config.js
new file mode 100644
index 0000000000..f737cad2aa
--- /dev/null
+++ b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store-2/_config.js
@@ -0,0 +1,9 @@
+// destructure to store value
+export default {
+	skip_if_ssr: true, // pending https://github.com/sveltejs/svelte/issues/3582
+	html: `<h1>2 2 xxx 5 6 9 10 2</h1>`,
+	async test({ assert, target, component }) {
+		await component.update();
+		assert.htmlEqual(target.innerHTML, `<h1>11 11 yyy 12 13 14 15 11</h1>`);
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store-2/main.svelte b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store-2/main.svelte
new file mode 100644
index 0000000000..c1bf63d9cd
--- /dev/null
+++ b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store-2/main.svelte
@@ -0,0 +1,29 @@
+<script>
+	import { writable } from 'svelte/store';
+
+	let eid = writable(1);
+	let foo;
+	const u = writable(2);
+	const v = writable(3);
+	const w = writable(4);
+	const x = writable(5);
+	const y = writable(6);
+	[$u, $v, $w] = [
+		{id: eid = writable(foo = 2), name: 'xxx'},
+		5,
+		6
+	];
+	({ a: $x, b: $y } = { a: 9, b: 10 });
+	$: z = $u.id;
+
+	export function update() {
+		[$u, $v, $w] = [
+			{id: eid = writable(foo = 11), name: 'yyy'},
+			12,
+			13
+		];
+		({ a: $x, b: $y } = { a: 14, b: 15 });
+	}
+</script>
+
+<h1>{foo} {$eid} {$u.name} {$v} {$w} {$x} {$y} {$z}</h1>
diff --git a/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/_config.js b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/_config.js
new file mode 100644
index 0000000000..0318e63b0a
--- /dev/null
+++ b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/_config.js
@@ -0,0 +1,9 @@
+// destructure to store
+export default {
+	html: `<h1>2 2 xxx 5 6 9 10 2</h1>`,
+	skip_if_ssr: true,
+	async test({ assert, target, component }) {
+		await component.update();
+		assert.htmlEqual(target.innerHTML, `<h1>11 11 yyy 12 13 14 15 11</h1>`);
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/main.svelte b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/main.svelte
new file mode 100644
index 0000000000..cd49223535
--- /dev/null
+++ b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/main.svelte
@@ -0,0 +1,29 @@
+<script>
+	import { writable } from 'svelte/store';
+
+	let eid = writable(1);
+	let foo;
+	let u;
+	let v;
+	let w;
+	let x;
+	let y;
+	[u, v, w] = [
+		{id: eid = writable(foo = 2), name: 'xxx'},
+		5,
+		writable(6)
+	];
+	({ a: x, b: y } = { a: writable(9), b: writable(10) });
+	$: z = u.id;
+
+	export function update() {
+		[u, v, w] = [
+			{id: eid = writable(foo = 11), name: 'yyy'},
+			12,
+			writable(13)
+		];
+		({ a: x, b: y } = { a: writable(14), b: writable(15) });
+	}
+</script>
+
+<h1>{foo} {$eid} {u.name} {v} {$w} {$x} {$y} {$z}</h1>
diff --git a/test/runtime/samples/reactive-assignment-in-declaration/main.svelte b/test/runtime/samples/reactive-assignment-in-declaration/main.svelte
index 8aa05964dd..edac4427bb 100644
--- a/test/runtime/samples/reactive-assignment-in-declaration/main.svelte
+++ b/test/runtime/samples/reactive-assignment-in-declaration/main.svelte
@@ -1,6 +1,9 @@
 <script>
 	let foo;
 	let bar = (foo = 1);
+	function a() {
+		bar = (foo = 1);
+	}
 </script>
 
 <h1>{foo} {bar}</h1>
diff --git a/test/runtime/samples/reactive-assignment-in-for-loop-head/main.svelte b/test/runtime/samples/reactive-assignment-in-for-loop-head/main.svelte
index 1c24f364ac..b007f6fe8b 100644
--- a/test/runtime/samples/reactive-assignment-in-for-loop-head/main.svelte
+++ b/test/runtime/samples/reactive-assignment-in-for-loop-head/main.svelte
@@ -1,9 +1,14 @@
 <script>
-  let foo1;
-  let foo2;
-  for (let bar = (foo1 = 0); bar < 5; bar += 1) {
-    foo2 = foo1;
-  }
+	let foo1;
+	let foo2;
+	for (let bar = (foo1 = 0); bar < 5; bar += 1) {
+		foo2 = foo1;
+	}
+	function a() {
+		for (let bar = (foo1 = 0); bar < 5; bar += 1) {
+			foo2 = foo1;
+		}
+	}
 </script>
 
 <h1>{foo1} {foo2}</h1>
diff --git a/test/runtime/samples/store-assignment-updates-property/_config.js b/test/runtime/samples/store-assignment-updates-property/_config.js
new file mode 100644
index 0000000000..65df38f9e4
--- /dev/null
+++ b/test/runtime/samples/store-assignment-updates-property/_config.js
@@ -0,0 +1,32 @@
+export default {
+	html: `
+		<p>a: {"foo":3,"bar":2}</p>
+		<p>b: {"foo":3}</p>
+		<button></button>
+		<button></button>
+	`,
+	skip_if_ssr: true,
+
+	async test({ assert, component, target, window }) {
+		const [btn1, btn2] = target.querySelectorAll('button');
+		const click = new window.MouseEvent('click');
+
+		await btn1.dispatchEvent(click);
+
+		assert.htmlEqual(target.innerHTML, `
+			<p>a: {"foo":4,"bar":2}</p>
+			<p>b: {"foo":4,"baz":0}</p>
+			<button></button>
+			<button></button>
+		`);
+
+		await btn2.dispatchEvent(click);
+
+		assert.htmlEqual(target.innerHTML, `
+			<p>a: {"foo":5,"bar":2}</p>
+			<p>b: {"foo":5,"qux":0}</p>
+			<button></button>
+			<button></button>
+		`);
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/store-assignment-updates-property/main.svelte b/test/runtime/samples/store-assignment-updates-property/main.svelte
new file mode 100644
index 0000000000..c3196a278c
--- /dev/null
+++ b/test/runtime/samples/store-assignment-updates-property/main.svelte
@@ -0,0 +1,24 @@
+<script>
+	import { writable } from '../../../../store';
+
+	const a = writable({ foo: 1, bar: 2 });
+	$a.foo = 3;
+
+	const b = writable({ foo: 1, bar: 2 });
+	$b = { foo: 3 };
+
+	function update() {
+		$a.foo = $a.foo + 1;
+		$b = { foo: $b.foo + 1, qux: 0 };
+	}
+</script>
+
+<p>a: {JSON.stringify($a)}</p>
+<p>b: {JSON.stringify($b)}</p>
+
+<button on:click={() => {
+	$a.foo = $a.foo + 1;
+	$b = { foo: $b.foo + 1, baz: 0 };
+}} />
+
+<button on:click={update} />
\ No newline at end of file
diff --git a/test/runtime/samples/store-resubscribe-c/_config.js b/test/runtime/samples/store-resubscribe-c/_config.js
new file mode 100644
index 0000000000..80b4fa702d
--- /dev/null
+++ b/test/runtime/samples/store-resubscribe-c/_config.js
@@ -0,0 +1,3 @@
+export default {
+	html: `31 42`
+};
diff --git a/test/runtime/samples/store-resubscribe-c/main.svelte b/test/runtime/samples/store-resubscribe-c/main.svelte
new file mode 100644
index 0000000000..c52a5402bd
--- /dev/null
+++ b/test/runtime/samples/store-resubscribe-c/main.svelte
@@ -0,0 +1,16 @@
+<script>
+	import { writable } from 'svelte/store';
+	const context = {
+		store1: writable(31),
+		store2: writable(42)
+	};
+	let store1;
+	let store2;
+	({
+		store1,
+		store2
+	} = context);
+</script>
+
+{$store1}
+{$store2}
diff --git a/test/runtime/samples/transition-js-args-dynamic/_config.js b/test/runtime/samples/transition-js-args-dynamic/_config.js
new file mode 100644
index 0000000000..513a17486a
--- /dev/null
+++ b/test/runtime/samples/transition-js-args-dynamic/_config.js
@@ -0,0 +1,15 @@
+export default {
+	test({ assert, component, target, window, raf }) {
+		component.visible = true;
+
+		const div = target.querySelector('div');
+
+		assert.equal(div.value, 0);
+
+		raf.tick(200);
+
+		div.value = 'test';
+		component.visible = false;
+		assert.equal(div.value, 'test');
+	}
+};
diff --git a/test/runtime/samples/transition-js-args-dynamic/main.svelte b/test/runtime/samples/transition-js-args-dynamic/main.svelte
new file mode 100644
index 0000000000..1bb149de32
--- /dev/null
+++ b/test/runtime/samples/transition-js-args-dynamic/main.svelte
@@ -0,0 +1,17 @@
+<script>
+	export let visible = false;
+	export let value = 0;
+
+	function foo(node, params) {
+		return {
+			duration: 100,
+			tick: () => {
+				node.value = value;
+			}
+		};
+	}
+</script>
+
+{#if visible}
+	<div transition:foo={{value}}></div>
+{/if}
\ No newline at end of file
diff --git a/test/validator/samples/action-object/input.svelte b/test/validator/samples/action-object/input.svelte
new file mode 100644
index 0000000000..e0962fa594
--- /dev/null
+++ b/test/validator/samples/action-object/input.svelte
@@ -0,0 +1,11 @@
+<script>
+	const obj = {
+		foo : "bar",
+		action(element, { leet }) {
+			element.foo = this.foo + leet;
+		},
+	}
+</script>
+
+<button use:obj.action={{ leet: 1337 }}>action</button>
+<button use:foo.action={{ leet: 1337 }}>action</button>
\ No newline at end of file
diff --git a/test/validator/samples/action-object/warnings.json b/test/validator/samples/action-object/warnings.json
new file mode 100644
index 0000000000..e1ccbb55a2
--- /dev/null
+++ b/test/validator/samples/action-object/warnings.json
@@ -0,0 +1,17 @@
+[
+	{
+		"code": "missing-declaration",
+		"end": {
+			"character": 217,
+			"column": 39,
+			"line": 11
+		},
+		"message": "'foo' is not defined",
+		"pos": 186,
+		"start": {
+			"character": 186,
+			"column": 8,
+			"line": 11
+		}
+	}
+]
diff --git a/test/validator/samples/event-modifiers-invalid-nonpassive/errors.json b/test/validator/samples/event-modifiers-invalid-nonpassive/errors.json
new file mode 100644
index 0000000000..a7e5a2a76c
--- /dev/null
+++ b/test/validator/samples/event-modifiers-invalid-nonpassive/errors.json
@@ -0,0 +1,15 @@
+[{
+	"message": "The 'passive' and 'nonpassive' modifiers cannot be used together",
+	"code": "invalid-event-modifier",
+	"start": {
+		"line": 1,
+		"column": 5,
+		"character": 5
+	},
+	"end": {
+		"line": 1,
+		"column": 51,
+		"character": 51
+	},
+	"pos": 5
+}]
diff --git a/test/validator/samples/event-modifiers-invalid-nonpassive/input.svelte b/test/validator/samples/event-modifiers-invalid-nonpassive/input.svelte
new file mode 100644
index 0000000000..3557aa4b1d
--- /dev/null
+++ b/test/validator/samples/event-modifiers-invalid-nonpassive/input.svelte
@@ -0,0 +1,3 @@
+<div on:touchstart|nonpassive|passive={handleWheel}>
+	oops
+</div>
\ No newline at end of file
diff --git a/test/validator/samples/event-modifiers-invalid/errors.json b/test/validator/samples/event-modifiers-invalid/errors.json
index 8be2ca7348..59a142d632 100644
--- a/test/validator/samples/event-modifiers-invalid/errors.json
+++ b/test/validator/samples/event-modifiers-invalid/errors.json
@@ -1,5 +1,5 @@
 [{
-	"message": "Valid event modifiers are preventDefault, stopPropagation, capture, once, passive or self",
+	"message": "Valid event modifiers are preventDefault, stopPropagation, capture, once, passive, nonpassive or self",
 	"code": "invalid-event-modifier",
 	"start": {
 		"line": 1,
diff --git a/test/validator/samples/import-meta/errors.json b/test/validator/samples/import-meta/errors.json
new file mode 100644
index 0000000000..0637a088a0
--- /dev/null
+++ b/test/validator/samples/import-meta/errors.json
@@ -0,0 +1 @@
+[]
\ No newline at end of file
diff --git a/test/validator/samples/import-meta/input.svelte b/test/validator/samples/import-meta/input.svelte
new file mode 100644
index 0000000000..a5ce32dd77
--- /dev/null
+++ b/test/validator/samples/import-meta/input.svelte
@@ -0,0 +1,6 @@
+<script>
+	const url = import.meta.url;
+</script>
+
+{url}
+{import.meta.url}