diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a2216284b..2ac9cce80a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Svelte changelog
 
+## 1.54.2
+
+* Prevent `await` blocks using stale state ([#1131](https://github.com/sveltejs/svelte/issues/1131))
+* Prevent erroneous missing data warnings for custom elements ([#1065](https://github.com/sveltejs/svelte/issues/1065))
+* Remove empty selectors in prod mode ([#1138](https://github.com/sveltejs/svelte/issues/1138))
+* Escape attribute values in SSR mode ([#1155](https://github.com/sveltejs/svelte/pull/1155))
+* Remove `<noscript>` elements in DOM mode ([#1108](https://github.com/sveltejs/svelte/issues/1108))
+* Allow hydration of non-root `<script>`/`<style>` tags ([#1163](https://github.com/sveltejs/svelte/pull/1163))
+
 ## 1.54.1
 
 * Hoist destructured references ([#1139](https://github.com/sveltejs/svelte/issues/1139))
diff --git a/package.json b/package.json
index d1886aee48..c05db23367 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "1.54.1",
+  "version": "1.54.2",
   "description": "The magical disappearing UI framework",
   "main": "compiler/svelte.js",
   "files": [
diff --git a/src/css/Stylesheet.ts b/src/css/Stylesheet.ts
index 6254795697..200e73f582 100644
--- a/src/css/Stylesheet.ts
+++ b/src/css/Stylesheet.ts
@@ -25,12 +25,13 @@ class Rule {
 		this.selectors.forEach(selector => selector.apply(node, stack)); // TODO move the logic in here?
 	}
 
-	isUsed() {
+	isUsed(dev: boolean) {
 		if (this.parent && this.parent.node.type === 'Atrule' && this.parent.node.name === 'keyframes') return true;
+		if (this.declarations.length === 0) return dev;
 		return this.selectors.some(s => s.used);
 	}
 
-	minify(code: MagicString, cascade: boolean) {
+	minify(code: MagicString, cascade: boolean, dev: boolean) {
 		let c = this.node.start;
 		let started = false;
 
@@ -177,11 +178,11 @@ class Atrule {
 		}
 	}
 
-	isUsed() {
+	isUsed(dev: boolean) {
 		return true; // TODO
 	}
 
-	minify(code: MagicString, cascade: boolean) {
+	minify(code: MagicString, cascade: boolean, dev: boolean) {
 		if (this.node.name === 'media') {
 			const expressionChar = code.original[this.node.expression.start];
 			let c = this.node.start + (expressionChar === '(' ? 6 : 7);
@@ -206,9 +207,9 @@ class Atrule {
 			let c = this.node.block.start + 1;
 
 			this.children.forEach(child => {
-				if (cascade || child.isUsed()) {
+				if (cascade || child.isUsed(dev)) {
 					code.remove(c, child.node.start);
-					child.minify(code, cascade);
+					child.minify(code, cascade, dev);
 					c = child.node.end;
 				}
 			});
@@ -257,6 +258,7 @@ export default class Stylesheet {
 	parsed: Parsed;
 	cascade: boolean;
 	filename: string;
+	dev: boolean;
 
 	hasStyles: boolean;
 	id: string;
@@ -264,11 +266,12 @@ export default class Stylesheet {
 	children: (Rule|Atrule)[];
 	keyframes: Map<string, string>;
 
-	constructor(source: string, parsed: Parsed, filename: string, cascade: boolean) {
+	constructor(source: string, parsed: Parsed, filename: string, cascade: boolean, dev: boolean) {
 		this.source = source;
 		this.parsed = parsed;
 		this.cascade = cascade;
 		this.filename = filename;
+		this.dev = dev;
 
 		this.children = [];
 		this.keyframes = new Map();
@@ -374,9 +377,9 @@ export default class Stylesheet {
 
 		let c = 0;
 		this.children.forEach(child => {
-			if (this.cascade || child.isUsed()) {
+			if (this.cascade || child.isUsed(this.dev)) {
 				code.remove(c, child.node.start);
-				child.minify(code, this.cascade);
+				child.minify(code, this.cascade, this.dev);
 				c = child.node.end;
 			}
 		});
diff --git a/src/generators/dom/index.ts b/src/generators/dom/index.ts
index 4d0ad713e8..08bdf0012f 100644
--- a/src/generators/dom/index.ts
+++ b/src/generators/dom/index.ts
@@ -219,7 +219,11 @@ export default function dom(
 				const message = generator.components.has(prop) ?
 					`${debugName} expected to find '${prop}' in \`data\`, but found it in \`components\` instead` :
 					`${debugName} was created without expected data property '${prop}'`;
-				return `if (!('${prop}' in this._state)) console.warn("${message}");`
+
+				const conditions = [`!('${prop}' in this._state)`];
+				if (generator.customElement) conditions.push(`!('${prop}' in this.attributes)`);
+
+				return `if (${conditions.join(' && ')}) console.warn("${message}");`
 			})}
 		${generator.bindingGroups.length &&
 			`this._bindingGroups = [${Array(generator.bindingGroups.length).fill('[]').join(', ')}];`}
diff --git a/src/generators/nodes/AwaitBlock.ts b/src/generators/nodes/AwaitBlock.ts
index 3b928f7804..445767d27f 100644
--- a/src/generators/nodes/AwaitBlock.ts
+++ b/src/generators/nodes/AwaitBlock.ts
@@ -127,8 +127,10 @@ export default class AwaitBlock extends Node {
 
 				if (@isPromise(${promise})) {
 					${promise}.then(function(${value}) {
+						var state = #component.get();
 						${replace_await_block}(${token}, ${create_then_block}, ${value}, ${params});
 					}, function (${error}) {
+						var state = #component.get();
 						${replace_await_block}(${token}, ${create_catch_block}, ${error}, ${params});
 					});
 
diff --git a/src/generators/nodes/Component.ts b/src/generators/nodes/Component.ts
index 1b9b1bb8b6..493302c3d5 100644
--- a/src/generators/nodes/Component.ts
+++ b/src/generators/nodes/Component.ts
@@ -140,40 +140,47 @@ export default class Component extends Node {
 				const setParentFromChildOnChange = new CodeBuilder();
 				const setParentFromChildOnInit = new CodeBuilder();
 
+				const setStoreFromChildOnChange = new CodeBuilder();
+				const setStoreFromChildOnInit = new CodeBuilder();
+
 				bindings.forEach((binding: Binding) => {
-					let setParentFromChild;
+					let { name: key } = getObject(binding.value);
+
+					const isStoreProp = generator.options.store && key[0] === '$';
+					if (isStoreProp) key = key.slice(1);
+					const newState = isStoreProp ? 'newStoreState' : 'newState';
 
 					binding.contexts.forEach(context => {
 						allContexts.add(context);
 					});
 
-					const { name: key } = getObject(binding.value);
+					let setFromChild;
 
-					if (block.contexts.has(key)) {
+					if (!isStoreProp && block.contexts.has(key)) {
 						const prop = binding.dependencies[0];
 						const computed = isComputed(binding.value);
 						const tail = binding.value.type === 'MemberExpression' ? getTailSnippet(binding.value) : '';
 
-						setParentFromChild = deindent`
+						setFromChild = deindent`
 							var list = ${name_context}.${block.listNames.get(key)};
 							var index = ${name_context}.${block.indexNames.get(key)};
 							list[index]${tail} = childState.${binding.name};
 
 							${binding.dependencies
-								.map((prop: string) => `newState.${prop} = state.${prop};`)
+								.map((prop: string) => `${newState}.${prop} = state.${prop};`)
 								.join('\n')}
 						`;
 					}
 
 					else if (binding.value.type === 'MemberExpression') {
-						setParentFromChild = deindent`
+						setFromChild = deindent`
 							${binding.snippet} = childState.${binding.name};
-							${binding.dependencies.map((prop: string) => `newState.${prop} = state.${prop};`).join('\n')}
+							${binding.dependencies.map((prop: string) => `${newState}.${prop} = state.${prop};`).join('\n')}
 						`;
 					}
 
 					else {
-						setParentFromChild = `newState.${binding.value.name} = childState.${binding.name};`;
+						setFromChild = `${newState}.${key} = childState.${binding.name};`;
 					}
 
 					statements.push(deindent`
@@ -183,14 +190,14 @@ export default class Component extends Node {
 						}`
 					);
 
-					setParentFromChildOnChange.addConditional(
+					(isStoreProp ? setStoreFromChildOnChange : setParentFromChildOnChange).addConditional(
 						`!${name_updating}.${binding.name} && changed.${binding.name}`,
-						setParentFromChild
+						setFromChild
 					);
 
-					setParentFromChildOnInit.addConditional(
+					(isStoreProp ? setStoreFromChildOnInit : setParentFromChildOnInit).addConditional(
 						`!${name_updating}.${binding.name}`,
-						setParentFromChild
+						setFromChild
 					);
 
 					// TODO could binding.dependencies.length ever be 0?
@@ -206,23 +213,45 @@ export default class Component extends Node {
 
 				componentInitProperties.push(`data: ${name_initial_data}`);
 
+				const initialisers = [
+					'state = #component.get()',
+					!setParentFromChildOnChange.isEmpty() && 'newState = {}',
+					!setStoreFromChildOnChange.isEmpty() && 'newStoreState = {}',
+				].filter(Boolean).join(', ');
+
 				componentInitProperties.push(deindent`
 					_bind: function(changed, childState) {
-						var state = #component.get(), newState = {};
-						${setParentFromChildOnChange}
-						${name_updating} = @assign({}, changed);
-						#component._set(newState);
+						var ${initialisers};
+						${!setStoreFromChildOnChange.isEmpty() && deindent`
+							${setStoreFromChildOnChange}
+							${name_updating} = @assign({}, changed);
+							#component.store.set(newStoreState);
+						`}
+						${!setParentFromChildOnChange.isEmpty() && deindent`
+							${setParentFromChildOnChange}
+							${name_updating} = @assign({}, changed);
+							#component._set(newState);
+						`}
 						${name_updating} = {};
 					}
 				`);
 
+				// TODO can `!childState` ever be true?
 				beforecreate = deindent`
 					#component.root._beforecreate.push(function() {
-						var state = #component.get(), childState = ${name}.get(), newState = {};
+						var childState = ${name}.get(), ${initialisers};
 						if (!childState) return;
 						${setParentFromChildOnInit}
-						${name_updating} = { ${bindings.map((binding: Binding) => `${binding.name}: true`).join(', ')} };
-						#component._set(newState);
+						${!setStoreFromChildOnInit.isEmpty() && deindent`
+							${setStoreFromChildOnInit}
+							${name_updating} = { ${bindings.map((binding: Binding) => `${binding.name}: true`).join(', ')} };
+							#component.store.set(newStoreState);
+						`}
+						${!setParentFromChildOnInit.isEmpty() && deindent`
+							${setParentFromChildOnInit}
+							${name_updating} = { ${bindings.map((binding: Binding) => `${binding.name}: true`).join(', ')} };
+							#component._set(newState);
+						`}
 						${name_updating} = {};
 					});
 				`;
diff --git a/src/generators/nodes/Element.ts b/src/generators/nodes/Element.ts
index 48852c27ea..a512b21d94 100644
--- a/src/generators/nodes/Element.ts
+++ b/src/generators/nodes/Element.ts
@@ -162,6 +162,8 @@ export default class Element extends Node {
 			this.generator.slots.add(slotName);
 		}
 
+		if (this.name === 'noscript') return;
+
 		const childState = {
 			parentNode: this.var,
 			parentNodes: parentNodes && block.getUniqueName(`${this.var}_nodes`) // if we're in unclaimable territory, i.e. <head>, parentNodes is null
@@ -415,7 +417,15 @@ export default class Element extends Node {
 		}
 
 		function toHTML(node: Element | Text) {
-			if (node.type === 'Text') return escapeHTML(node.data);
+			if (node.type === 'Text') {
+				return node.parent &&
+					node.parent.type === 'Element' &&
+					(node.parent.name === 'script' || node.parent.name === 'style')
+					? node.data
+					: escapeHTML(node.data);
+			}
+
+			if (node.name === 'noscript') return '';
 
 			let open = `<${node.name}`;
 
@@ -433,10 +443,6 @@ export default class Element extends Node {
 
 			if (isVoidElementName(node.name)) return open + '>';
 
-			if (node.name === 'script' || node.name === 'style') {
-				return `${open}>${node.data}</${node.name}>`;
-			}
-
 			return `${open}>${node.children.map(toHTML).join('')}</${node.name}>`;
 		}
 	}
diff --git a/src/generators/server-side-rendering/visitors/Component.ts b/src/generators/server-side-rendering/visitors/Component.ts
index 4843010fcb..a5cef9120f 100644
--- a/src/generators/server-side-rendering/visitors/Component.ts
+++ b/src/generators/server-side-rendering/visitors/Component.ts
@@ -6,7 +6,7 @@ import { AppendTarget } from '../interfaces';
 import { Node } from '../../../interfaces';
 import getObject from '../../../utils/getObject';
 import getTailSnippet from '../../../utils/getTailSnippet';
-import { stringify } from '../../../utils/stringify';
+import { escape, escapeTemplate, stringify } from '../../../utils/stringify';
 
 export default function visitComponent(
 	generator: SsrGenerator,
@@ -14,7 +14,9 @@ export default function visitComponent(
 	node: Node
 ) {
 	function stringifyAttribute(chunk: Node) {
-		if (chunk.type === 'Text') return chunk.data;
+		if (chunk.type === 'Text') {
+			return escapeTemplate(escape(chunk.data));
+		}
 		if (chunk.type === 'MustacheTag') {
 			block.contextualise(chunk.expression);
 			const { snippet } = chunk.metadata;
diff --git a/src/generators/server-side-rendering/visitors/Element.ts b/src/generators/server-side-rendering/visitors/Element.ts
index 486f0f01a3..21ec923e3d 100644
--- a/src/generators/server-side-rendering/visitors/Element.ts
+++ b/src/generators/server-side-rendering/visitors/Element.ts
@@ -68,8 +68,6 @@ export default function visitElement(
 
 	if (node.name === 'textarea' && textareaContents !== undefined) {
 		generator.append(textareaContents);
-	} else if (node.name === 'script' || node.name === 'style') {
-		generator.append(escape(node.data));
 	} else {
 		node.children.forEach((child: Node) => {
 			visit(generator, block, child);
diff --git a/src/generators/server-side-rendering/visitors/MustacheTag.ts b/src/generators/server-side-rendering/visitors/MustacheTag.ts
index 29fa7aa083..795e78dd33 100644
--- a/src/generators/server-side-rendering/visitors/MustacheTag.ts
+++ b/src/generators/server-side-rendering/visitors/MustacheTag.ts
@@ -10,5 +10,11 @@ export default function visitMustacheTag(
 	block.contextualise(node.expression);
 	const { snippet } = node.metadata;
 
-	generator.append('${__escape(' + snippet + ')}');
+	generator.append(
+		node.parent &&
+		node.parent.type === 'Element' &&
+		node.parent.name === 'style'
+			? '${' + snippet + '}'
+			: '${__escape(' + snippet + ')}'
+	);
 }
diff --git a/src/generators/server-side-rendering/visitors/Text.ts b/src/generators/server-side-rendering/visitors/Text.ts
index 44b1665b2b..ecb37e433c 100644
--- a/src/generators/server-side-rendering/visitors/Text.ts
+++ b/src/generators/server-side-rendering/visitors/Text.ts
@@ -1,6 +1,6 @@
 import { SsrGenerator } from '../index';
 import Block from '../Block';
-import { escape, escapeHTML } from '../../../utils/stringify';
+import { escape, escapeHTML, escapeTemplate } from '../../../utils/stringify';
 import { Node } from '../../../interfaces';
 
 export default function visitText(
@@ -8,5 +8,14 @@ export default function visitText(
 	block: Block,
 	node: Node
 ) {
-	generator.append(escapeHTML(escape(node.data).replace(/(\${|`|\\)/g, '\\$1')));
+	let text = node.data;
+	if (
+		!node.parent ||
+		node.parent.type !== 'Element' ||
+		(node.parent.name !== 'script' && node.parent.name !== 'style')
+	) {
+		// unless this Text node is inside a <script> or <style> element, escape &,<,>
+		text = escapeHTML(text);
+	}
+	generator.append(escape(escapeTemplate(text)));
 }
diff --git a/src/generators/server-side-rendering/visitors/shared/stringifyAttributeValue.ts b/src/generators/server-side-rendering/visitors/shared/stringifyAttributeValue.ts
index 22eb0eff76..a5399414cd 100644
--- a/src/generators/server-side-rendering/visitors/shared/stringifyAttributeValue.ts
+++ b/src/generators/server-side-rendering/visitors/shared/stringifyAttributeValue.ts
@@ -1,17 +1,17 @@
 import Block from '../../Block';
-import { escape } from '../../../../utils/stringify';
+import { escape, escapeTemplate } from '../../../../utils/stringify';
 import { Node } from '../../../../interfaces';
 
 export default function stringifyAttributeValue(block: Block, chunks: Node[]) {
 	return chunks
 		.map((chunk: Node) => {
 			if (chunk.type === 'Text') {
-				return escape(chunk.data).replace(/"/g, '&quot;');
+				return escapeTemplate(escape(chunk.data).replace(/"/g, '&quot;'));
 			}
 
 			block.contextualise(chunk.expression);
 			const { snippet } = chunk.metadata;
-			return '${' + snippet + '}';
+			return '${__escape(' + snippet + ')}';
 		})
 		.join('');
 }
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index 1caf5b5abc..be62f07763 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -116,7 +116,7 @@ export function compile(source: string, _options: CompileOptions) {
 		return;
 	}
 
-	const stylesheet = new Stylesheet(source, parsed, options.filename, options.cascade !== false);
+	const stylesheet = new Stylesheet(source, parsed, options.filename, options.cascade !== false, options.dev);
 
 	validate(parsed, source, stylesheet, options);
 
diff --git a/src/parse/state/tag.ts b/src/parse/state/tag.ts
index a659dc6d3d..8b701cae1d 100644
--- a/src/parse/state/tag.ts
+++ b/src/parse/state/tag.ts
@@ -224,10 +224,22 @@ export default function tag(parser: Parser) {
 		);
 		parser.read(/<\/textarea>/);
 		element.end = parser.index;
-	} else if (name === 'script' || name === 'style') {
+	} else if (name === 'script') {
 		// special case
-		element.data = parser.readUntil(new RegExp(`</${name}>`));
-		parser.eat(`</${name}>`, true);
+		const start = parser.index;
+		const data = parser.readUntil(/<\/script>/);
+		const end = parser.index;
+		element.children.push({ start, end, type: 'Text', data });
+		parser.eat('</script>', true);
+		element.end = parser.index;
+	} else if (name === 'style') {
+		// special case
+		element.children = readSequence(
+			parser,
+			() =>
+				parser.template.slice(parser.index, parser.index + 8) === '</style>'
+		);
+		parser.read(/<\/style>/);
 		element.end = parser.index;
 	} else {
 		parser.stack.push(element);
diff --git a/src/utils/stringify.ts b/src/utils/stringify.ts
index 0fb151c162..43cbd934c3 100644
--- a/src/utils/stringify.ts
+++ b/src/utils/stringify.ts
@@ -17,3 +17,7 @@ const escaped = {
 export function escapeHTML(html) {
 	return String(html).replace(/[&<>]/g, match => escaped[match]);
 }
+
+export function escapeTemplate(str) {
+	return str.replace(/(\${|`|\\)/g, '\\$1');
+}
diff --git a/test/css/samples/cascade-false-empty-rule-dev/_config.js b/test/css/samples/cascade-false-empty-rule-dev/_config.js
new file mode 100644
index 0000000000..8b2e3aa341
--- /dev/null
+++ b/test/css/samples/cascade-false-empty-rule-dev/_config.js
@@ -0,0 +1,4 @@
+export default {
+	cascade: false,
+	dev: true
+};
\ No newline at end of file
diff --git a/test/css/samples/cascade-false-empty-rule-dev/expected.css b/test/css/samples/cascade-false-empty-rule-dev/expected.css
new file mode 100644
index 0000000000..5e2b654711
--- /dev/null
+++ b/test/css/samples/cascade-false-empty-rule-dev/expected.css
@@ -0,0 +1 @@
+.foo[svelte-xyz]{}
\ No newline at end of file
diff --git a/test/css/samples/cascade-false-empty-rule-dev/input.html b/test/css/samples/cascade-false-empty-rule-dev/input.html
new file mode 100644
index 0000000000..ac2e43dceb
--- /dev/null
+++ b/test/css/samples/cascade-false-empty-rule-dev/input.html
@@ -0,0 +1,7 @@
+<div class='foo'></div>
+
+<style>
+	.foo {
+		/* empty */
+	}
+</style>
\ No newline at end of file
diff --git a/test/css/samples/cascade-false-empty-rule/_config.js b/test/css/samples/cascade-false-empty-rule/_config.js
new file mode 100644
index 0000000000..b37866f9b6
--- /dev/null
+++ b/test/css/samples/cascade-false-empty-rule/_config.js
@@ -0,0 +1,3 @@
+export default {
+	cascade: false
+};
\ No newline at end of file
diff --git a/test/css/samples/cascade-false-empty-rule/expected.css b/test/css/samples/cascade-false-empty-rule/expected.css
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/test/css/samples/cascade-false-empty-rule/input.html b/test/css/samples/cascade-false-empty-rule/input.html
new file mode 100644
index 0000000000..ac2e43dceb
--- /dev/null
+++ b/test/css/samples/cascade-false-empty-rule/input.html
@@ -0,0 +1,7 @@
+<div class='foo'></div>
+
+<style>
+	.foo {
+		/* empty */
+	}
+</style>
\ No newline at end of file
diff --git a/test/custom-elements/index.js b/test/custom-elements/index.js
index 7f0d3b462c..ab101dc873 100644
--- a/test/custom-elements/index.js
+++ b/test/custom-elements/index.js
@@ -3,7 +3,7 @@ import * as http from 'http';
 import { rollup } from 'rollup';
 import virtual from 'rollup-plugin-virtual';
 import Nightmare from 'nightmare';
-import { addLineNumbers, loadSvelte } from "../helpers.js";
+import { addLineNumbers, loadConfig, loadSvelte } from "../helpers.js";
 
 const page = `
 <body>
@@ -57,6 +57,8 @@ describe('custom-elements', function() {
 		const solo = /\.solo$/.test(dir);
 
 		(solo ? it.only : it)(dir, () => {
+			const config = loadConfig(`./custom-elements/samples/${dir}/_config.js`);
+
 			return rollup({
 				input: `test/custom-elements/samples/${dir}/test.js`,
 				plugins: [
@@ -64,7 +66,8 @@ describe('custom-elements', function() {
 						transform(code, id) {
 							if (id.endsWith('.html')) {
 								const compiled = svelte.compile(code, {
-									customElement: true
+									customElement: true,
+									dev: config.dev
 								});
 
 								return {
diff --git a/test/custom-elements/samples/no-missing-prop-warnings/_config.js b/test/custom-elements/samples/no-missing-prop-warnings/_config.js
new file mode 100644
index 0000000000..e26996239d
--- /dev/null
+++ b/test/custom-elements/samples/no-missing-prop-warnings/_config.js
@@ -0,0 +1,3 @@
+export default {
+	dev: true
+};
\ No newline at end of file
diff --git a/test/custom-elements/samples/no-missing-prop-warnings/main.html b/test/custom-elements/samples/no-missing-prop-warnings/main.html
new file mode 100644
index 0000000000..088c96947a
--- /dev/null
+++ b/test/custom-elements/samples/no-missing-prop-warnings/main.html
@@ -0,0 +1,8 @@
+<p>foo: {{foo}}</p>
+<p>bar: {{bar}}</p>
+
+<script>
+	export default {
+		tag: 'my-app'
+	};
+</script>
\ No newline at end of file
diff --git a/test/custom-elements/samples/no-missing-prop-warnings/test.js b/test/custom-elements/samples/no-missing-prop-warnings/test.js
new file mode 100644
index 0000000000..675fa66485
--- /dev/null
+++ b/test/custom-elements/samples/no-missing-prop-warnings/test.js
@@ -0,0 +1,18 @@
+import * as assert from 'assert';
+import './main.html';
+
+export default function (target) {
+	const warnings = [];
+	const warn = console.warn;
+
+	console.warn = warning => {
+		warnings.push(warning);
+	};
+
+	target.innerHTML = '<my-app foo=yes />';
+
+	assert.equal(warnings.length, 1);
+	assert.equal(warnings[0], `<my-app> was created without expected data property 'bar'`);
+
+	console.warn = warn;
+}
\ No newline at end of file
diff --git a/test/runtime/samples/attribute-dynamic-quotemarks/_config.js b/test/runtime/samples/attribute-dynamic-quotemarks/_config.js
new file mode 100644
index 0000000000..b9f4364624
--- /dev/null
+++ b/test/runtime/samples/attribute-dynamic-quotemarks/_config.js
@@ -0,0 +1,3 @@
+export default {
+	html: `<span title='"foo"'>foo</span>`
+};
diff --git a/test/runtime/samples/attribute-dynamic-quotemarks/main.html b/test/runtime/samples/attribute-dynamic-quotemarks/main.html
new file mode 100644
index 0000000000..b5c3be5bbd
--- /dev/null
+++ b/test/runtime/samples/attribute-dynamic-quotemarks/main.html
@@ -0,0 +1 @@
+<span title='{{"\"foo\""}}'>foo</span>
diff --git a/test/runtime/samples/await-set-simultaneous/_config.js b/test/runtime/samples/await-set-simultaneous/_config.js
new file mode 100644
index 0000000000..97f79f6119
--- /dev/null
+++ b/test/runtime/samples/await-set-simultaneous/_config.js
@@ -0,0 +1,16 @@
+export default {
+	test(assert, component, target) {
+		const promise = Promise.resolve().then(() => component.set({ answer: 42 }));
+
+		component.set({ promise });
+
+		assert.htmlEqual(target.innerHTML, `<p>wait for it...</p>`);
+
+		return promise
+			.then(() => {
+				assert.htmlEqual(target.innerHTML, `
+					<p>the answer is 42!</p>
+				`);
+			});
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/await-set-simultaneous/main.html b/test/runtime/samples/await-set-simultaneous/main.html
new file mode 100644
index 0000000000..3740a90480
--- /dev/null
+++ b/test/runtime/samples/await-set-simultaneous/main.html
@@ -0,0 +1,9 @@
+{{#if promise}}
+	{{#await promise}}
+		<p>wait for it...</p>
+	{{then _}}
+		<p>the answer is {{answer}}!</p>
+	{{catch error}}
+		<p>well that's odd</p>
+	{{/await}}
+{{/if}}
\ No newline at end of file
diff --git a/test/runtime/samples/escape-template-literals/Widget.html b/test/runtime/samples/escape-template-literals/Widget.html
new file mode 100644
index 0000000000..f0136f9405
--- /dev/null
+++ b/test/runtime/samples/escape-template-literals/Widget.html
@@ -0,0 +1 @@
+<div>{{value}}</div>
diff --git a/test/runtime/samples/escape-template-literals/_config.js b/test/runtime/samples/escape-template-literals/_config.js
index df22784ba7..1419d65679 100644
--- a/test/runtime/samples/escape-template-literals/_config.js
+++ b/test/runtime/samples/escape-template-literals/_config.js
@@ -1,3 +1,3 @@
 export default {
-	html: '<code>`${foo}\\n`</code>'
+	html: '<code>`${foo}\\n`</code>\n<div title="`${foo}\\n`">foo</div>\n<div>`${foo}\\n`</div>',
 };
diff --git a/test/runtime/samples/escape-template-literals/main.html b/test/runtime/samples/escape-template-literals/main.html
index 4705d114d2..138b390cfa 100644
--- a/test/runtime/samples/escape-template-literals/main.html
+++ b/test/runtime/samples/escape-template-literals/main.html
@@ -1 +1,8 @@
 <code>`${foo}\n`</code>
+<div title="`${foo}\n`">foo</div>
+<Widget value="`${foo}\n`"/>
+
+<script>
+	import Widget from './Widget.html';
+	export default { components: { Widget } };
+</script>
diff --git a/test/runtime/samples/non-root-style-interpolation/_config.js b/test/runtime/samples/non-root-style-interpolation/_config.js
new file mode 100644
index 0000000000..01cefdd67e
--- /dev/null
+++ b/test/runtime/samples/non-root-style-interpolation/_config.js
@@ -0,0 +1,52 @@
+export default {
+	data: {
+		color: 'red',
+		foo: '/* < & > */',
+	},
+
+	html: `
+		<div>
+			<style>
+				/* something with < and > */
+				div {
+					color: blue;
+				}
+			</style>
+			foo
+		</div>
+
+		<div>
+			<div>
+				<style>
+					div > div {
+						color: blue;
+					}
+				</style>
+				foo
+			</div>
+		</div>
+
+		<div>
+			<style>
+				/* something with < and > */
+				/* < & > */
+				div {
+					color: red;
+				}
+			</style>
+			foo
+		</div>
+
+		<div>
+			<div>
+				<style>
+					/* < & > */
+					div > div {
+						color: red;
+					}
+				</style>
+				foo
+			</div>
+		</div>
+	`,
+};
diff --git a/test/runtime/samples/non-root-style-interpolation/main.html b/test/runtime/samples/non-root-style-interpolation/main.html
new file mode 100644
index 0000000000..1908f64808
--- /dev/null
+++ b/test/runtime/samples/non-root-style-interpolation/main.html
@@ -0,0 +1,43 @@
+<div>
+	<style>
+		/* something with < and > */
+		div {
+			color: blue;
+		}
+	</style>
+	foo
+</div>
+
+<div>
+	<div>
+		<style>
+			div > div {
+				color: blue;
+			}
+		</style>
+		foo
+	</div>
+</div>
+
+<div>
+	<style>
+		/* something with < and > */
+		{{foo}}
+		div {
+			color: {{color}};
+		}
+	</style>
+	foo
+</div>
+
+<div>
+	<div>
+		<style>
+			{{foo}}
+			div > div {
+				color: {{color}};
+			}
+		</style>
+		foo
+	</div>
+</div>
diff --git a/test/runtime/samples/noscript-removal/_config.js b/test/runtime/samples/noscript-removal/_config.js
new file mode 100644
index 0000000000..d935af9493
--- /dev/null
+++ b/test/runtime/samples/noscript-removal/_config.js
@@ -0,0 +1,9 @@
+export default {
+	'skip-ssr': true,
+
+	html: `
+	<div>foo</div>
+
+	<div>foo<div>foo</div></div>
+`,
+};
diff --git a/test/runtime/samples/noscript-removal/main.html b/test/runtime/samples/noscript-removal/main.html
new file mode 100644
index 0000000000..0cc2155e5d
--- /dev/null
+++ b/test/runtime/samples/noscript-removal/main.html
@@ -0,0 +1,5 @@
+<noscript>foo</noscript>
+
+<div>foo<noscript>foo</noscript></div>
+
+<div>foo<div>foo<noscript>foo</noscript></div></div>
diff --git a/test/runtime/samples/script-style-non-top-level/_config.js b/test/runtime/samples/script-style-non-top-level/_config.js
new file mode 100644
index 0000000000..1aade72239
--- /dev/null
+++ b/test/runtime/samples/script-style-non-top-level/_config.js
@@ -0,0 +1,8 @@
+export default {
+	html: `
+		<div>
+			<style>div { color: red; }</style>
+			<script>alert('<>');</script>
+		</div>
+	`
+};
\ No newline at end of file
diff --git a/test/runtime/samples/script-style-non-top-level/main.html b/test/runtime/samples/script-style-non-top-level/main.html
new file mode 100644
index 0000000000..94cf72e4bd
--- /dev/null
+++ b/test/runtime/samples/script-style-non-top-level/main.html
@@ -0,0 +1,4 @@
+<div>
+	<style>div { color: red; }</style>
+	<script>alert('<>');</script>
+</div>
\ No newline at end of file
diff --git a/test/runtime/samples/sigil-component-attribute/Widget.html b/test/runtime/samples/sigil-component-attribute/Widget.html
new file mode 100644
index 0000000000..f0136f9405
--- /dev/null
+++ b/test/runtime/samples/sigil-component-attribute/Widget.html
@@ -0,0 +1 @@
+<div>{{value}}</div>
diff --git a/test/runtime/samples/sigil-component-attribute/_config.js b/test/runtime/samples/sigil-component-attribute/_config.js
new file mode 100644
index 0000000000..079bf3e9ab
--- /dev/null
+++ b/test/runtime/samples/sigil-component-attribute/_config.js
@@ -0,0 +1,4 @@
+export default {
+	data: { foo: 'foo' },
+	html: `<div>foo @ foo # foo</div>`,
+};
diff --git a/test/runtime/samples/sigil-component-attribute/main.html b/test/runtime/samples/sigil-component-attribute/main.html
new file mode 100644
index 0000000000..c9302309d2
--- /dev/null
+++ b/test/runtime/samples/sigil-component-attribute/main.html
@@ -0,0 +1,6 @@
+<Widget value='foo @ {{foo}} # foo'/>
+
+<script>
+	import Widget from './Widget.html';
+	export default { components: { Widget } };
+</script>
diff --git a/test/runtime/samples/store-component-binding/TextInput.html b/test/runtime/samples/store-component-binding/TextInput.html
new file mode 100644
index 0000000000..f24d608cd5
--- /dev/null
+++ b/test/runtime/samples/store-component-binding/TextInput.html
@@ -0,0 +1 @@
+<input bind:value>
\ No newline at end of file
diff --git a/test/runtime/samples/store-component-binding/_config.js b/test/runtime/samples/store-component-binding/_config.js
new file mode 100644
index 0000000000..aefc4ec652
--- /dev/null
+++ b/test/runtime/samples/store-component-binding/_config.js
@@ -0,0 +1,28 @@
+import { Store } from '../../../../store.js';
+
+const store = new Store({
+	name: 'world'
+});
+
+export default {
+	store,
+
+	html: `
+		<h1>Hello world!</h1>
+		<input>
+	`,
+
+	test(assert, component, target, window) {
+		const input = target.querySelector('input');
+		const event = new window.Event('input');
+
+		input.value = 'everybody';
+		input.dispatchEvent(event);
+
+		assert.equal(store.get('name'), 'everybody');
+		assert.htmlEqual(target.innerHTML, `
+			<h1>Hello everybody!</h1>
+			<input>
+		`);
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/store-component-binding/main.html b/test/runtime/samples/store-component-binding/main.html
new file mode 100644
index 0000000000..aaebf609d2
--- /dev/null
+++ b/test/runtime/samples/store-component-binding/main.html
@@ -0,0 +1,10 @@
+<h1>Hello {{$name}}!</h1>
+<TextInput bind:value=$name/>
+
+<script>
+	import TextInput from './TextInput.html';
+
+	export default {
+		components: { TextInput }
+	};
+</script>
\ No newline at end of file