diff --git a/src/generators/dom/index.ts b/src/generators/dom/index.ts
index 1d25c4bcfc..fdf5c89339 100644
--- a/src/generators/dom/index.ts
+++ b/src/generators/dom/index.ts
@@ -267,7 +267,7 @@ export default function dom(
 			this._fragment.c();
 			this._fragment.${block.hasIntroMethod ? 'i' : 'm'}(this.shadowRoot, null);
 
-			if (options.target) this._mount(options.target, options.anchor || null);
+			if (options.target) this._mount(options.target, options.anchor);
 		` : deindent`
 			if (options.target) {
 				${generator.hydratable
@@ -280,7 +280,7 @@ export default function dom(
 						${options.dev && `if (options.hydrate) throw new Error("options.hydrate only works if the component was compiled with the \`hydratable: true\` option");`}
 						this._fragment.c();
 					`}
-				this._fragment.${block.hasIntroMethod ? 'i' : 'm'}(options.target, options.anchor || null);
+				this._mount(options.target, options.anchor);
 
 				${(generator.hasComponents || generator.hasComplexBindings || templateProperties.oncreate || generator.hasIntroTransitions) && deindent`
 					${generator.hasComponents && `this._lock = true;`}
diff --git a/src/shared/index.js b/src/shared/index.js
index d9d6475e64..fcc4369364 100644
--- a/src/shared/index.js
+++ b/src/shared/index.js
@@ -185,7 +185,7 @@ export function callAll(fns) {
 }
 
 export function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 export function _unmount() {
diff --git a/test/js/samples/collapses-text-around-comments/expected-bundle.js b/test/js/samples/collapses-text-around-comments/expected-bundle.js
index 5a321c0311..c122117285 100644
--- a/test/js/samples/collapses-text-around-comments/expected-bundle.js
+++ b/test/js/samples/collapses-text-around-comments/expected-bundle.js
@@ -171,7 +171,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -252,7 +252,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/collapses-text-around-comments/expected.js b/test/js/samples/collapses-text-around-comments/expected.js
index 17e612b644..1b44fc3493 100644
--- a/test/js/samples/collapses-text-around-comments/expected.js
+++ b/test/js/samples/collapses-text-around-comments/expected.js
@@ -59,7 +59,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/component-static-immutable/expected-bundle.js b/test/js/samples/component-static-immutable/expected-bundle.js
index 047169075a..c7969997a6 100644
--- a/test/js/samples/component-static-immutable/expected-bundle.js
+++ b/test/js/samples/component-static-immutable/expected-bundle.js
@@ -151,7 +151,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -219,7 +219,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/component-static-immutable/expected.js b/test/js/samples/component-static-immutable/expected.js
index 647b068179..5a60d641c2 100644
--- a/test/js/samples/component-static-immutable/expected.js
+++ b/test/js/samples/component-static-immutable/expected.js
@@ -45,7 +45,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/component-static-immutable2/expected-bundle.js b/test/js/samples/component-static-immutable2/expected-bundle.js
index 047169075a..c7969997a6 100644
--- a/test/js/samples/component-static-immutable2/expected-bundle.js
+++ b/test/js/samples/component-static-immutable2/expected-bundle.js
@@ -151,7 +151,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -219,7 +219,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/component-static-immutable2/expected.js b/test/js/samples/component-static-immutable2/expected.js
index 647b068179..5a60d641c2 100644
--- a/test/js/samples/component-static-immutable2/expected.js
+++ b/test/js/samples/component-static-immutable2/expected.js
@@ -45,7 +45,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/component-static/expected-bundle.js b/test/js/samples/component-static/expected-bundle.js
index 5798f22df2..ec0d4ddff4 100644
--- a/test/js/samples/component-static/expected-bundle.js
+++ b/test/js/samples/component-static/expected-bundle.js
@@ -147,7 +147,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -215,7 +215,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/component-static/expected.js b/test/js/samples/component-static/expected.js
index a689848dc0..2207d7a8e3 100644
--- a/test/js/samples/component-static/expected.js
+++ b/test/js/samples/component-static/expected.js
@@ -45,7 +45,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/computed-collapsed-if/expected-bundle.js b/test/js/samples/computed-collapsed-if/expected-bundle.js
index 08d3d2fca9..c297a03460 100644
--- a/test/js/samples/computed-collapsed-if/expected-bundle.js
+++ b/test/js/samples/computed-collapsed-if/expected-bundle.js
@@ -147,7 +147,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -203,7 +203,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/computed-collapsed-if/expected.js b/test/js/samples/computed-collapsed-if/expected.js
index d87ef16f92..2398f4bdee 100644
--- a/test/js/samples/computed-collapsed-if/expected.js
+++ b/test/js/samples/computed-collapsed-if/expected.js
@@ -33,7 +33,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/css-media-query/expected-bundle.js b/test/js/samples/css-media-query/expected-bundle.js
index 51f7c56732..da3fbb3ef8 100644
--- a/test/js/samples/css-media-query/expected-bundle.js
+++ b/test/js/samples/css-media-query/expected-bundle.js
@@ -167,7 +167,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -239,7 +239,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/css-media-query/expected.js b/test/js/samples/css-media-query/expected.js
index 6e03ca0a0a..942d330947 100644
--- a/test/js/samples/css-media-query/expected.js
+++ b/test/js/samples/css-media-query/expected.js
@@ -49,7 +49,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js b/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
index 9ed1bbcef8..45aa714ea2 100644
--- a/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
+++ b/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
@@ -159,7 +159,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -221,7 +221,7 @@ class SvelteComponent extends HTMLElement {
 		this._fragment.c();
 		this._fragment.m(this.shadowRoot, null);
 
-		if (options.target) this._mount(options.target, options.anchor || null);
+		if (options.target) this._mount(options.target, options.anchor);
 	}
 
 	static get observedAttributes() {
diff --git a/test/js/samples/css-shadow-dom-keyframes/expected.js b/test/js/samples/css-shadow-dom-keyframes/expected.js
index 39dd83e5cb..7682ec0a40 100644
--- a/test/js/samples/css-shadow-dom-keyframes/expected.js
+++ b/test/js/samples/css-shadow-dom-keyframes/expected.js
@@ -39,7 +39,7 @@ class SvelteComponent extends HTMLElement {
 		this._fragment.c();
 		this._fragment.m(this.shadowRoot, null);
 
-		if (options.target) this._mount(options.target, options.anchor || null);
+		if (options.target) this._mount(options.target, options.anchor);
 	}
 
 	static get observedAttributes() {
diff --git a/test/js/samples/deconflict-globals/expected-bundle.js b/test/js/samples/deconflict-globals/expected-bundle.js
index e210ffe3ac..050af86e46 100644
--- a/test/js/samples/deconflict-globals/expected-bundle.js
+++ b/test/js/samples/deconflict-globals/expected-bundle.js
@@ -147,7 +147,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -211,7 +211,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		callAll(this._oncreate);
 	}
diff --git a/test/js/samples/deconflict-globals/expected.js b/test/js/samples/deconflict-globals/expected.js
index d740fe634d..8e00df8d4a 100644
--- a/test/js/samples/deconflict-globals/expected.js
+++ b/test/js/samples/deconflict-globals/expected.js
@@ -42,7 +42,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		callAll(this._oncreate);
 	}
diff --git a/test/js/samples/do-use-dataset/expected-bundle.js b/test/js/samples/do-use-dataset/expected-bundle.js
index 229e4a3450..ea6c4c26c0 100644
--- a/test/js/samples/do-use-dataset/expected-bundle.js
+++ b/test/js/samples/do-use-dataset/expected-bundle.js
@@ -163,7 +163,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -233,7 +233,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/do-use-dataset/expected.js b/test/js/samples/do-use-dataset/expected.js
index 27a335d0a6..b88636a606 100644
--- a/test/js/samples/do-use-dataset/expected.js
+++ b/test/js/samples/do-use-dataset/expected.js
@@ -47,7 +47,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/dont-use-dataset-in-legacy/expected-bundle.js b/test/js/samples/dont-use-dataset-in-legacy/expected-bundle.js
index 75ce562da6..b1a3d273fa 100644
--- a/test/js/samples/dont-use-dataset-in-legacy/expected-bundle.js
+++ b/test/js/samples/dont-use-dataset-in-legacy/expected-bundle.js
@@ -167,7 +167,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -237,7 +237,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/dont-use-dataset-in-legacy/expected.js b/test/js/samples/dont-use-dataset-in-legacy/expected.js
index e9062d7ba1..699da1270b 100644
--- a/test/js/samples/dont-use-dataset-in-legacy/expected.js
+++ b/test/js/samples/dont-use-dataset-in-legacy/expected.js
@@ -47,7 +47,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/dont-use-dataset-in-svg/expected-bundle.js b/test/js/samples/dont-use-dataset-in-svg/expected-bundle.js
index 6cd012d4b7..311366c776 100644
--- a/test/js/samples/dont-use-dataset-in-svg/expected-bundle.js
+++ b/test/js/samples/dont-use-dataset-in-svg/expected-bundle.js
@@ -167,7 +167,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -235,7 +235,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/dont-use-dataset-in-svg/expected.js b/test/js/samples/dont-use-dataset-in-svg/expected.js
index 9e541886bc..4269367254 100644
--- a/test/js/samples/dont-use-dataset-in-svg/expected.js
+++ b/test/js/samples/dont-use-dataset-in-svg/expected.js
@@ -45,7 +45,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/each-block-changed-check/expected-bundle.js b/test/js/samples/each-block-changed-check/expected-bundle.js
index 11916f82b4..59b104ef0e 100644
--- a/test/js/samples/each-block-changed-check/expected-bundle.js
+++ b/test/js/samples/each-block-changed-check/expected-bundle.js
@@ -179,7 +179,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -360,7 +360,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/each-block-changed-check/expected.js b/test/js/samples/each-block-changed-check/expected.js
index 2eb66567a6..f76e10d943 100644
--- a/test/js/samples/each-block-changed-check/expected.js
+++ b/test/js/samples/each-block-changed-check/expected.js
@@ -158,7 +158,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/event-handlers-custom/expected-bundle.js b/test/js/samples/event-handlers-custom/expected-bundle.js
index 25f4ea324a..eaf52c8c7d 100644
--- a/test/js/samples/event-handlers-custom/expected-bundle.js
+++ b/test/js/samples/event-handlers-custom/expected-bundle.js
@@ -159,7 +159,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -233,7 +233,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/event-handlers-custom/expected.js b/test/js/samples/event-handlers-custom/expected.js
index 785fefbeef..ecc6f97855 100644
--- a/test/js/samples/event-handlers-custom/expected.js
+++ b/test/js/samples/event-handlers-custom/expected.js
@@ -52,7 +52,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/head-no-whitespace/expected-bundle.js b/test/js/samples/head-no-whitespace/expected-bundle.js
index f3eec8c97b..fe4181879a 100644
--- a/test/js/samples/head-no-whitespace/expected-bundle.js
+++ b/test/js/samples/head-no-whitespace/expected-bundle.js
@@ -159,7 +159,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -224,7 +224,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/head-no-whitespace/expected.js b/test/js/samples/head-no-whitespace/expected.js
index 9ba161c69d..9818f42116 100644
--- a/test/js/samples/head-no-whitespace/expected.js
+++ b/test/js/samples/head-no-whitespace/expected.js
@@ -42,7 +42,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/if-block-no-update/expected-bundle.js b/test/js/samples/if-block-no-update/expected-bundle.js
index 662f80f0aa..bccbabab70 100644
--- a/test/js/samples/if-block-no-update/expected-bundle.js
+++ b/test/js/samples/if-block-no-update/expected-bundle.js
@@ -163,7 +163,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -281,7 +281,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/if-block-no-update/expected.js b/test/js/samples/if-block-no-update/expected.js
index 31b4b0f7a4..8bcac42cab 100644
--- a/test/js/samples/if-block-no-update/expected.js
+++ b/test/js/samples/if-block-no-update/expected.js
@@ -95,7 +95,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/if-block-simple/expected-bundle.js b/test/js/samples/if-block-simple/expected-bundle.js
index 9298283711..684a5aa6f1 100644
--- a/test/js/samples/if-block-simple/expected-bundle.js
+++ b/test/js/samples/if-block-simple/expected-bundle.js
@@ -163,7 +163,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -258,7 +258,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/if-block-simple/expected.js b/test/js/samples/if-block-simple/expected.js
index 4c999546c0..11d3ccbdc6 100644
--- a/test/js/samples/if-block-simple/expected.js
+++ b/test/js/samples/if-block-simple/expected.js
@@ -72,7 +72,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-optimized-multiple/expected-bundle.js b/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
index 682b3f0423..4df73d50d2 100644
--- a/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
@@ -163,7 +163,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -231,7 +231,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-optimized-multiple/expected.js b/test/js/samples/inline-style-optimized-multiple/expected.js
index ce3ffda243..7a94993b69 100644
--- a/test/js/samples/inline-style-optimized-multiple/expected.js
+++ b/test/js/samples/inline-style-optimized-multiple/expected.js
@@ -45,7 +45,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-optimized-url/expected-bundle.js b/test/js/samples/inline-style-optimized-url/expected-bundle.js
index 38f088a8e7..ad89d07b5e 100644
--- a/test/js/samples/inline-style-optimized-url/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized-url/expected-bundle.js
@@ -163,7 +163,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -226,7 +226,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-optimized-url/expected.js b/test/js/samples/inline-style-optimized-url/expected.js
index 376cad092a..5a27ecfa49 100644
--- a/test/js/samples/inline-style-optimized-url/expected.js
+++ b/test/js/samples/inline-style-optimized-url/expected.js
@@ -40,7 +40,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-optimized/expected-bundle.js b/test/js/samples/inline-style-optimized/expected-bundle.js
index e875dfc740..b012a321bb 100644
--- a/test/js/samples/inline-style-optimized/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized/expected-bundle.js
@@ -163,7 +163,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -226,7 +226,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-optimized/expected.js b/test/js/samples/inline-style-optimized/expected.js
index 74c4b6f417..86dabe8d21 100644
--- a/test/js/samples/inline-style-optimized/expected.js
+++ b/test/js/samples/inline-style-optimized/expected.js
@@ -40,7 +40,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-unoptimized/expected-bundle.js b/test/js/samples/inline-style-unoptimized/expected-bundle.js
index 77a78ca5c0..2d36273b6e 100644
--- a/test/js/samples/inline-style-unoptimized/expected-bundle.js
+++ b/test/js/samples/inline-style-unoptimized/expected-bundle.js
@@ -163,7 +163,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -237,7 +237,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/inline-style-unoptimized/expected.js b/test/js/samples/inline-style-unoptimized/expected.js
index 04e1226f6d..7d7e933c12 100644
--- a/test/js/samples/inline-style-unoptimized/expected.js
+++ b/test/js/samples/inline-style-unoptimized/expected.js
@@ -51,7 +51,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/input-without-blowback-guard/expected-bundle.js b/test/js/samples/input-without-blowback-guard/expected-bundle.js
index 64b1dd79ad..0b5089c08d 100644
--- a/test/js/samples/input-without-blowback-guard/expected-bundle.js
+++ b/test/js/samples/input-without-blowback-guard/expected-bundle.js
@@ -167,7 +167,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -237,7 +237,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/input-without-blowback-guard/expected.js b/test/js/samples/input-without-blowback-guard/expected.js
index d313c7c01d..307a26c53c 100644
--- a/test/js/samples/input-without-blowback-guard/expected.js
+++ b/test/js/samples/input-without-blowback-guard/expected.js
@@ -47,7 +47,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/legacy-default/expected-bundle.js b/test/js/samples/legacy-default/expected-bundle.js
index ce2e08302b..534b9d6baa 100644
--- a/test/js/samples/legacy-default/expected-bundle.js
+++ b/test/js/samples/legacy-default/expected-bundle.js
@@ -181,7 +181,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -275,7 +275,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/legacy-default/expected.js b/test/js/samples/legacy-default/expected.js
index 6c90bb8f13..64dc4121c0 100644
--- a/test/js/samples/legacy-default/expected.js
+++ b/test/js/samples/legacy-default/expected.js
@@ -71,7 +71,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/legacy-input-type/expected-bundle.js b/test/js/samples/legacy-input-type/expected-bundle.js
index 69d4f501dc..5cc1296a4f 100644
--- a/test/js/samples/legacy-input-type/expected-bundle.js
+++ b/test/js/samples/legacy-input-type/expected-bundle.js
@@ -165,7 +165,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -224,7 +224,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/legacy-input-type/expected.js b/test/js/samples/legacy-input-type/expected.js
index 5236b758dc..2426c06481 100644
--- a/test/js/samples/legacy-input-type/expected.js
+++ b/test/js/samples/legacy-input-type/expected.js
@@ -36,7 +36,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/legacy-quote-class/expected-bundle.js b/test/js/samples/legacy-quote-class/expected-bundle.js
index acc11efb5c..4a20d61232 100644
--- a/test/js/samples/legacy-quote-class/expected-bundle.js
+++ b/test/js/samples/legacy-quote-class/expected-bundle.js
@@ -182,7 +182,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -251,7 +251,7 @@ function SvelteComponent(options) {
 		var nodes = children(options.target);
 		options.hydrate ? this._fragment.l(nodes) : this._fragment.c();
 		nodes.forEach(detachNode);
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/legacy-quote-class/expected.js b/test/js/samples/legacy-quote-class/expected.js
index 76490fd6f9..de50dfa5e7 100644
--- a/test/js/samples/legacy-quote-class/expected.js
+++ b/test/js/samples/legacy-quote-class/expected.js
@@ -46,7 +46,7 @@ function SvelteComponent(options) {
 		var nodes = children(options.target);
 		options.hydrate ? this._fragment.l(nodes) : this._fragment.c();
 		nodes.forEach(detachNode);
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/media-bindings/expected-bundle.js b/test/js/samples/media-bindings/expected-bundle.js
index 552a17c725..8287902dff 100644
--- a/test/js/samples/media-bindings/expected-bundle.js
+++ b/test/js/samples/media-bindings/expected-bundle.js
@@ -175,7 +175,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -295,7 +295,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		callAll(this._beforecreate);
 	}
diff --git a/test/js/samples/media-bindings/expected.js b/test/js/samples/media-bindings/expected.js
index 527e233cfd..a395dd4385 100644
--- a/test/js/samples/media-bindings/expected.js
+++ b/test/js/samples/media-bindings/expected.js
@@ -97,7 +97,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		callAll(this._beforecreate);
 	}
diff --git a/test/js/samples/non-imported-component/expected-bundle.js b/test/js/samples/non-imported-component/expected-bundle.js
index 85a5f677a9..399e3d594d 100644
--- a/test/js/samples/non-imported-component/expected-bundle.js
+++ b/test/js/samples/non-imported-component/expected-bundle.js
@@ -161,7 +161,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -240,7 +240,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/non-imported-component/expected.js b/test/js/samples/non-imported-component/expected.js
index 089e8db6e5..c1637b7cc4 100644
--- a/test/js/samples/non-imported-component/expected.js
+++ b/test/js/samples/non-imported-component/expected.js
@@ -57,7 +57,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		this._lock = true;
 		callAll(this._beforecreate);
diff --git a/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js b/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
index 09775d1f81..783831720b 100644
--- a/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
+++ b/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
@@ -147,7 +147,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -206,7 +206,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		callAll(this._oncreate);
 	}
diff --git a/test/js/samples/onrender-onteardown-rewritten/expected.js b/test/js/samples/onrender-onteardown-rewritten/expected.js
index 83e8d6200f..1d91737faa 100644
--- a/test/js/samples/onrender-onteardown-rewritten/expected.js
+++ b/test/js/samples/onrender-onteardown-rewritten/expected.js
@@ -38,7 +38,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 
 		callAll(this._oncreate);
 	}
diff --git a/test/js/samples/setup-method/expected-bundle.js b/test/js/samples/setup-method/expected-bundle.js
index c30f01edb1..b4465e2a6b 100644
--- a/test/js/samples/setup-method/expected-bundle.js
+++ b/test/js/samples/setup-method/expected-bundle.js
@@ -147,7 +147,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -210,7 +210,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/setup-method/expected.js b/test/js/samples/setup-method/expected.js
index e4778f5826..12dc0b2452 100644
--- a/test/js/samples/setup-method/expected.js
+++ b/test/js/samples/setup-method/expected.js
@@ -40,7 +40,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/svg-title/expected-bundle.js b/test/js/samples/svg-title/expected-bundle.js
index 2beb78a678..534d98b185 100644
--- a/test/js/samples/svg-title/expected-bundle.js
+++ b/test/js/samples/svg-title/expected-bundle.js
@@ -167,7 +167,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -225,7 +225,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/svg-title/expected.js b/test/js/samples/svg-title/expected.js
index 059d1d804d..3f7ea0b8e9 100644
--- a/test/js/samples/svg-title/expected.js
+++ b/test/js/samples/svg-title/expected.js
@@ -35,7 +35,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/title/expected-bundle.js b/test/js/samples/title/expected-bundle.js
index c37f7cb20a..e1de24a335 100644
--- a/test/js/samples/title/expected-bundle.js
+++ b/test/js/samples/title/expected-bundle.js
@@ -147,7 +147,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -201,7 +201,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/title/expected.js b/test/js/samples/title/expected.js
index d5546cd4c2..0e059bbb4c 100644
--- a/test/js/samples/title/expected.js
+++ b/test/js/samples/title/expected.js
@@ -31,7 +31,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/use-elements-as-anchors/expected-bundle.js b/test/js/samples/use-elements-as-anchors/expected-bundle.js
index 8a4a7817a3..fbfb801019 100644
--- a/test/js/samples/use-elements-as-anchors/expected-bundle.js
+++ b/test/js/samples/use-elements-as-anchors/expected-bundle.js
@@ -171,7 +171,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -448,7 +448,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/use-elements-as-anchors/expected.js b/test/js/samples/use-elements-as-anchors/expected.js
index 0ff85d63b0..5f6f27c742 100644
--- a/test/js/samples/use-elements-as-anchors/expected.js
+++ b/test/js/samples/use-elements-as-anchors/expected.js
@@ -254,7 +254,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/window-binding-scroll/expected-bundle.js b/test/js/samples/window-binding-scroll/expected-bundle.js
index cac144881d..0fca60a0f8 100644
--- a/test/js/samples/window-binding-scroll/expected-bundle.js
+++ b/test/js/samples/window-binding-scroll/expected-bundle.js
@@ -167,7 +167,7 @@ function callAll(fns) {
 }
 
 function _mount(target, anchor) {
-	this._fragment.m(target, anchor);
+	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
 }
 
 function _unmount() {
@@ -250,7 +250,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/js/samples/window-binding-scroll/expected.js b/test/js/samples/window-binding-scroll/expected.js
index 0c22523b61..59009aeb9b 100644
--- a/test/js/samples/window-binding-scroll/expected.js
+++ b/test/js/samples/window-binding-scroll/expected.js
@@ -60,7 +60,7 @@ function SvelteComponent(options) {
 
 	if (options.target) {
 		this._fragment.c();
-		this._fragment.m(options.target, options.anchor || null);
+		this._mount(options.target, options.anchor);
 	}
 }
 
diff --git a/test/runtime/samples/transition-js-nested-intro/Child.html b/test/runtime/samples/transition-js-nested-intro/Child.html
new file mode 100644
index 0000000000..32a4b81152
--- /dev/null
+++ b/test/runtime/samples/transition-js-nested-intro/Child.html
@@ -0,0 +1,17 @@
+<div transition:foo><slot></slot></div>
+
+<script>
+	export default {
+		transitions: {
+			foo: function ( node, params ) {
+				return {
+					delay: 50,
+					duration: 100,
+					tick: t => {
+						node.foo = t;
+					}
+				};
+			}
+		}
+	};
+</script>
\ No newline at end of file
diff --git a/test/runtime/samples/transition-js-nested-intro/_config.js b/test/runtime/samples/transition-js-nested-intro/_config.js
new file mode 100644
index 0000000000..9906be26d2
--- /dev/null
+++ b/test/runtime/samples/transition-js-nested-intro/_config.js
@@ -0,0 +1,21 @@
+export default {
+	test ( assert, component, target, window, raf ) {
+		component.set({ visible: true });
+		const div = target.querySelector( 'div' );
+		assert.equal( div.foo, 0 );
+
+		raf.tick( 50 );
+		assert.equal( div.foo, 0 );
+
+		raf.tick( 100 );
+		assert.equal( div.foo, 0.5 );
+
+		raf.tick( 125 );
+		assert.equal( div.foo, 0.75 );
+
+		raf.tick( 150 );
+		assert.equal( div.foo, 1 );
+
+		component.destroy();
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/transition-js-nested-intro/main.html b/test/runtime/samples/transition-js-nested-intro/main.html
new file mode 100644
index 0000000000..c8bf70b0ae
--- /dev/null
+++ b/test/runtime/samples/transition-js-nested-intro/main.html
@@ -0,0 +1,10 @@
+{{#if visible}}
+	<Child>delayed</Child>
+{{/if}}
+
+<script>
+	import Child from './Child.html';
+	export default {
+		components:{ Child }
+	};
+</script>
\ No newline at end of file