chore: add missing test for #13158 (#13255)

Author: Rich-Harris

packages/svelte/tests/runtime-runes/samples/invalid-html-ssr/_config.js

@@ -5,15 +5,16 @@ export default test({
 		dev: true
 	},
 
-	html: `<p></p><h1>foo</h1><p></p><form></form>`,
+	html: `<p></p><h1>foo</h1><p></p><form></form> hello`,
 
 	recover: true,
 
 	mode: ['hydrate'],
 
 	errors: [
 		'node_invalid_placement_ssr: `<p>` (main.svelte:6:0) cannot contain `<h1>` (h1.svelte:1:0)\n\nThis can cause content to shift around as the browser repairs the HTML, and will likely result in a `hydration_mismatch` warning.',
-		'node_invalid_placement_ssr: `<form>` (main.svelte:9:0) cannot contain `<form>` (form.svelte:1:0)\n\nThis can cause content to shift around as the browser repairs the HTML, and will likely result in a `hydration_mismatch` warning.'
+		'node_invalid_placement_ssr: `<form>` (main.svelte:9:0) cannot contain `<form>` (form.svelte:1:0)\n\nThis can cause content to shift around as the browser repairs the HTML, and will likely result in a `hydration_mismatch` warning.',
+		'node_invalid_placement_ssr: `<td>` (main.svelte:12:0) needs a valid parent element\n\nThis can cause content to shift around as the browser repairs the HTML, and will likely result in a `hydration_mismatch` warning.'
 	],
 
 	warnings: [

packages/svelte/tests/runtime-runes/samples/invalid-html-ssr/main.svelte

@@ -9,3 +9,4 @@
 <form>
 	<Form />
 </form>
+<td>hello</td>