Sandbox: Set the `style` attribute of all `Element` child to be a live target (#72208)

public/app/features/plugins/sandbox/document_sandbox.ts

@@ -79,13 +79,9 @@ export function isDomElement(obj: unknown): obj is Element {
  * This is necessary for plugins working with style attributes to work in Chrome
  */
 export function markDomElementStyleAsALiveTarget(el: Element) {
-  if (
-    // only HTMLElement's (extends Element) have a style attribute
-    el instanceof HTMLElement &&
-    // do not define it twice
-    !Object.hasOwn(el.style, SANDBOX_LIVE_VALUE)
-  ) {
-    Reflect.defineProperty(el.style, SANDBOX_LIVE_VALUE, {});
+  const style = Reflect.get(el, 'style');
+  if (!Object.hasOwn(style, SANDBOX_LIVE_VALUE)) {
+    Reflect.defineProperty(style, SANDBOX_LIVE_VALUE, {});
   }
 }