fix(html): discover media elements and attach store target via DOM (#481)

packages/html/src/ui/media-element.ts

@@ -1,6 +1,10 @@
 import { ReactiveElement } from '@lit/reactive-element';
 import type { Constructor } from '@videojs/utils/types';
 
-export class MediaElement extends ReactiveElement {}
+export class MediaElement extends ReactiveElement {
+  protected createRenderRoot() {
+    return this;
+  }
+}
 
 export interface MediaElementConstructor extends Constructor<MediaElement> {}