MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* EmbedVideo: hide placeholder/fallback token text that can show in some themes */
.embedvideo .embedvideo-load,
.embedvideo .embedvideo-service-youtube,
.embedvideo .embedvideo-service {
  font-size: 0 !important;
  line-height: 0 !important;
}

/* If the placeholders are rendered as unknown custom tags, hide them too */
embedvideo-load,
embedvideo-service-youtube,
embedvideo-service {
  display: none !important;
}

/* TEST: should be obvious if Common.css is loading */
body { outline: 6px solid red !important; }