From 44ac3a9950e150d7b0ff9184cba9c47a187f9cb3 Mon Sep 17 00:00:00 2001
From: daimond113 <contact@daimond113.com>
Date: Thu, 24 Jul 2025 13:20:29 +0200
Subject: [PATCH] fix: prevent duplicates

---
 packages/svelte/src/internal/server/index.js                   | 2 ++
 .../samples/form-default-value-from-spread/_config.js          | 1 +
 .../samples/form-default-value-from-spread/main.svelte         | 3 ++-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/svelte/src/internal/server/index.js b/packages/svelte/src/internal/server/index.js
index 5ccfb7ec8e..913f526d70 100644
--- a/packages/svelte/src/internal/server/index.js
+++ b/packages/svelte/src/internal/server/index.js
@@ -205,8 +205,10 @@ export function spread_attributes(attrs, css_hash, classes, styles, flags = 0) {
 		if (!ignore_defaults) {
 			if (name === 'defaultvalue') {
 				name = 'value';
+				if (attrs[name]) continue;
 			} else if (name === 'defaultchecked') {
 				name = 'checked';
+				if (attrs[name]) continue;
 			}
 		}
 
diff --git a/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/_config.js b/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/_config.js
index 83a2575fbf..3808ae6530 100644
--- a/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/_config.js
@@ -5,5 +5,6 @@ export default test({
 	html: `
 		<input value="a">
 		<input type="checkbox" checked>
+		<input value="b">
 `
 });
diff --git a/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/main.svelte b/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/main.svelte
index 5a17622bed..7c0ce9cbe3 100644
--- a/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/main.svelte
+++ b/packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/main.svelte
@@ -4,4 +4,5 @@
 </script>
 
 <input {...text} />
-<input type="checkbox" {...checkbox} />
\ No newline at end of file
+<input type="checkbox" {...checkbox} />
+<input value="b" {...text} />
\ No newline at end of file