From 5abf96a99e01c0b2ddbb47af03d41c4e44009c22 Mon Sep 17 00:00:00 2001
From: navorite <navorite@gmail.com>
Date: Tue, 6 Feb 2024 16:45:32 +0200
Subject: [PATCH 1/2] fix: set initial value for `open` binding in `<details>`

---
 .changeset/strange-apricots-happen.md                 |  5 +++++
 packages/svelte/src/compiler/phases/bindings.js       |  1 +
 .../samples/details-binding-initial/_config.js        | 11 +++++++++++
 .../samples/details-binding-initial/main.svelte       |  8 ++++++++
 4 files changed, 25 insertions(+)
 create mode 100644 .changeset/strange-apricots-happen.md
 create mode 100644 packages/svelte/tests/runtime-runes/samples/details-binding-initial/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/details-binding-initial/main.svelte

diff --git a/.changeset/strange-apricots-happen.md b/.changeset/strange-apricots-happen.md
new file mode 100644
index 000000000000..a3893ec3bdfc
--- /dev/null
+++ b/.changeset/strange-apricots-happen.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: set initial value for `open` binding in `<details>`
diff --git a/packages/svelte/src/compiler/phases/bindings.js b/packages/svelte/src/compiler/phases/bindings.js
index d8f04e173276..820c66d886ff 100644
--- a/packages/svelte/src/compiler/phases/bindings.js
+++ b/packages/svelte/src/compiler/phases/bindings.js
@@ -175,6 +175,7 @@ export const binding_properties = {
 	textContent: {},
 	open: {
 		event: 'toggle',
+		type: 'set',
 		valid_elements: ['details']
 	},
 	value: {
diff --git a/packages/svelte/tests/runtime-runes/samples/details-binding-initial/_config.js b/packages/svelte/tests/runtime-runes/samples/details-binding-initial/_config.js
new file mode 100644
index 000000000000..d0ecf3192306
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/details-binding-initial/_config.js
@@ -0,0 +1,11 @@
+import { ok, test } from '../../test';
+
+export default test({
+	test({ assert, target }) {
+		const details_el = target.querySelector('details');
+
+		ok(details_el);
+
+		assert.strictEqual(details_el.open, true);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/details-binding-initial/main.svelte b/packages/svelte/tests/runtime-runes/samples/details-binding-initial/main.svelte
new file mode 100644
index 000000000000..fda553038e27
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/details-binding-initial/main.svelte
@@ -0,0 +1,8 @@
+<script>
+	let open = $state(true);
+</script>
+
+<details bind:open>
+	 <summary>Details</summary>
+	 ...
+</details>

From df39f3f568cbeeaebe0679580a93fc1135189008 Mon Sep 17 00:00:00 2001
From: navorite <navorite@gmail.com>
Date: Tue, 6 Feb 2024 16:52:22 +0200
Subject: [PATCH 2/2] accurate desc

---
 .changeset/strange-apricots-happen.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.changeset/strange-apricots-happen.md b/.changeset/strange-apricots-happen.md
index a3893ec3bdfc..d61dfb514989 100644
--- a/.changeset/strange-apricots-happen.md
+++ b/.changeset/strange-apricots-happen.md
@@ -2,4 +2,4 @@
 'svelte': patch
 ---
 
-fix: set initial value for `open` binding in `<details>`
+fix: set `open` binding value in `<details>`