fix: remove indeterminate from boolean attributes

It's only existing as a boolean property
cleanup of #7944

src/shared/boolean_attributes.ts

@@ -1,4 +1,3 @@
-// source: https://html.spec.whatwg.org/multipage/indices.html
 const _boolean_attributes = [
 	'allowfullscreen',
 	'allowpaymentrequest',
@@ -12,7 +11,6 @@ const _boolean_attributes = [
 	'disabled',
 	'formnovalidate',
 	'hidden',
-	'indeterminate',
 	'inert',
 	'ismap',
 	'itemscope',
@@ -30,4 +28,9 @@ const _boolean_attributes = [
 ] as const;
 
 export type BooleanAttributes = typeof _boolean_attributes[number];
+
+/**
+ * List of HTML boolean attributes (e.g. `<input disabled>`).
+ * Source: https://html.spec.whatwg.org/multipage/indices.html
+ */
 export const boolean_attributes: Set<string> = new Set([..._boolean_attributes]);

test/runtime/samples/attribute-boolean-indeterminate/_config.js

@@ -1,14 +1,14 @@
 export default {
+	// This is a bit of a funny one — there's no equivalent attribute,
+	// so it can't be server-rendered
+	skip_if_ssr: true,
+
 	props: {
 		indeterminate: true
 	},
 
 	html: "<input type='checkbox'>",
 
-	// somehow ssr will render indeterminate=""
-	// the hydrated html will still contain that attribute
-	ssrHtml: "<input type='checkbox' indeterminate=''>",
-
 	test({ assert, component, target }) {
 		const input = target.querySelector('input');