message: Restored legacy fullscreen availability check
diff: @@ -97,11 +97,12 @@ const cssTransitionSupport = function (): string | false {
  return false;
  },
  + legacyDocument = document as LegacyDocument,
  hasFullscreenSupport = !!(
  - document.fullscreenEnabled// ||
  - //document.webkitFullscreenEnabled ||
  - //document.mozFullScreenEnabled ||
  - //document.msFullscreenEnabled
  + legacyDocument.fullscreenEnabled ||
  + legacyDocument.webkitFullscreenEnabled ||
  + legacyDocument.mozFullScreenEnabled ||
  + legacyDocument.msFullscreenEnabled
  ),
  hasHistorySupport = !!(window.history && history.pushState);
  