/* 
indicate media without a description

https://gist.github.com/FiXato/3de505b04efefd49a1e3568b70545234

initial code by Paul (https://linernotes.club/@balrogboogie), expanded upon by FiXato (https://contact.fixato.org)
related discussions: https://dragonscave.space/@Mayana/106443499687608116.
Feel free to reuse it; it's public domain (https://linernotes.club/@balrogboogie/106681622019395866) 
*/
 
.media-gallery__item-thumbnail img:not([alt]), 
.media-gallery__item-thumbnail img[alt|=""], 
.media-gallery__item-thumbnail img[alt^=" "],
.media-gallery__preview img:not([alt]),
.media-gallery__preview img[alt|=""],
.media-gallery__preview img[alt^=" "],
.audio-player__canvas:not([title]), 
.audio-player__canvas[title|=""], 
.audio-player__canvas[title^=" "], 
.video-player video:not([title]), 
.video-player video[title|=""], 
.video-player video[title^=" "],
.media-gallery__gifv video:not([title]), 
.media-gallery__gifv video[title|=""],
.media-gallery__gifv video[title^=" "] 
{
    border: 8px dashed red;
    box-sizing: border-box;
}