[Exposed=Window]
interface HTMLUserMediaElement : HTMLElement {
  [HTMLConstructor] constructor();

  [CEReactions] attribute DOMString type;
  attribute EventHandler onstream;

  static boolean isTypeSupported(DOMString type);

  readonly attribute MediaStream? stream;
  readonly attribute any error;

  undefined setConstraints(optional MediaStreamConstraints constraints = {});
};

HTMLUserMediaElement includes InPagePermissionMixin;