better fix

packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js

@@ -6,7 +6,7 @@
 import { escape_html } from '../../../../../escaping.js';
 import {
 	is_boolean_attribute,
-	get_dom_property,
+	is_dom_property,
 	is_load_error_element,
 	is_void
 } from '../../../../../utils.js';
@@ -557,31 +557,27 @@ function build_element_attribute_update_assignment(element, node_id, attribute,
 		update = b.stmt(b.call('$.set_value', node_id, value));
 	} else if (name === 'checked') {
 		update = b.stmt(b.call('$.set_checked', node_id, value));
+	} else if (is_dom_property(name)) {
+		update = b.stmt(b.assignment('=', b.member(node_id, name), value));
 	} else {
-		const dom_property = get_dom_property(name);
+		if (name === 'style' && attribute.metadata.expression.has_state && has_call) {
-
+			// ensure we're not creating a separate template effect for this so that
-		if (dom_property) {
+			// potential style directives are added to the same effect and therefore always apply
-			update = b.stmt(b.assignment('=', b.member(node_id, dom_property), value));
+			const id = b.id(state.scope.generate('style_derived'));
-		} else {
+			state.init.push(b.const(id, create_derived(state, b.thunk(value))));
-			if (name === 'style' && attribute.metadata.expression.has_state && has_call) {
+			value = b.call('$.get', id);
-				// ensure we're not creating a separate template effect for this so that
+			has_call = false;
-				// potential style directives are added to the same effect and therefore always apply
-				const id = b.id(state.scope.generate('style_derived'));
-				state.init.push(b.const(id, create_derived(state, b.thunk(value))));
-				value = b.call('$.get', id);
-				has_call = false;
-			}
-			const callee = name.startsWith('xlink') ? '$.set_xlink_attribute' : '$.set_attribute';
-			update = b.stmt(
-				b.call(
-					callee,
-					node_id,
-					b.literal(name),
-					value,
-					is_ignored(element, 'hydration_attribute_changed') && b.true
-				)
-			);
 		}
+		const callee = name.startsWith('xlink') ? '$.set_xlink_attribute' : '$.set_attribute';
+		update = b.stmt(
+			b.call(
+				callee,
+				node_id,
+				b.literal(name),
+				value,
+				is_ignored(element, 'hydration_attribute_changed') && b.true
+			)
+		);
 	}
 
 	if (attribute.metadata.expression.has_state) {

packages/svelte/src/utils.js

@@ -192,7 +192,8 @@ const ATTRIBUTE_ALIASES = {
 	ismap: 'isMap',
 	nomodule: 'noModule',
 	playsinline: 'playsInline',
-	readonly: 'readOnly'
+	readonly: 'readOnly',
+	srcobject: 'srcObject'
 };
 
 /**
@@ -216,20 +217,11 @@ const DOM_PROPERTIES = [
 	'srcObject'
 ];
 
-/** @type {Map<string, string>} */
-let DOM_PROPERTIES_MAP;
-
 /**
  * @param {string} name
- * @returns {string | undefined}
  */
-export function get_dom_property(name) {
+export function is_dom_property(name) {
-	if (!DOM_PROPERTIES_MAP) {
+	return DOM_PROPERTIES.includes(name);
-		DOM_PROPERTIES_MAP = new Map(
-			DOM_PROPERTIES.map((property) => [property.toLowerCase(), property])
-		);
-	}
-	return DOM_PROPERTIES_MAP.get(name);
 }
 
 /**