From 8241096b06d5dfb2fc5374ce704e6b30c01e26dd Mon Sep 17 00:00:00 2001
From: Simon H <5968653+dummdidumm@users.noreply.github.com>
Date: Tue, 7 Jan 2025 20:24:53 +0100
Subject: [PATCH] fix: treat `inert` as a boolean attribute (#14935)

* fix: treat `inert` as a boolean attribute

fixes #14731

* remove solo: true

---------

Co-authored-by: Rich Harris <rich.harris@vercel.com>
---
 .changeset/quiet-planets-carry.md               |  5 +++++
 packages/svelte/src/utils.js                    |  2 +-
 .../samples/attribute-boolean-inert/_config.js  | 17 ++++++++++++-----
 .../samples/attribute-boolean-inert/main.svelte |  1 +
 4 files changed, 19 insertions(+), 6 deletions(-)
 create mode 100644 .changeset/quiet-planets-carry.md

diff --git a/.changeset/quiet-planets-carry.md b/.changeset/quiet-planets-carry.md
new file mode 100644
index 0000000000..0abeffa2e8
--- /dev/null
+++ b/.changeset/quiet-planets-carry.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: treat `inert` as a boolean attribute
diff --git a/packages/svelte/src/utils.js b/packages/svelte/src/utils.js
index e42721b4f4..76486d32ac 100644
--- a/packages/svelte/src/utils.js
+++ b/packages/svelte/src/utils.js
@@ -156,6 +156,7 @@ const DOM_BOOLEAN_ATTRIBUTES = [
 	'formnovalidate',
 	'hidden',
 	'indeterminate',
+	'inert',
 	'ismap',
 	'loop',
 	'multiple',
@@ -214,7 +215,6 @@ const DOM_PROPERTIES = [
 	'playsInline',
 	'readOnly',
 	'value',
-	'inert',
 	'volume',
 	'defaultValue',
 	'defaultChecked',
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/_config.js b/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/_config.js
index 1322d63b7a..26fbbc955b 100644
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/_config.js
+++ b/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/_config.js
@@ -1,14 +1,21 @@
-import { ok, test } from '../../test';
+import { test } from '../../test';
 
 export default test({
+	ssrHtml: `
+		<div></div>
+		<div inert="">some div <button>click</button></div>
+	`,
+
 	get props() {
 		return { inert: true };
 	},
+
 	test({ assert, target, component }) {
-		const div = target.querySelector('div');
-		ok(div);
-		assert.ok(div.inert);
+		const [div1, div2] = target.querySelectorAll('div');
+		assert.ok(!div1.inert);
+		assert.ok(div2.inert);
+
 		component.inert = false;
-		assert.ok(!div.inert);
+		assert.ok(!div2.inert);
 	}
 });
diff --git a/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/main.svelte b/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/main.svelte
index 6c3df7e31e..3b97923713 100644
--- a/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/main.svelte
+++ b/packages/svelte/tests/runtime-legacy/samples/attribute-boolean-inert/main.svelte
@@ -2,4 +2,5 @@
 export let inert;
 </script>
 
+<div inert={false}></div>
 <div {inert}>some div <button>click</button></div>