cadars

https://github.com/cadars/portable-php/pull/5

And as a bookmarklet that seems to be persistent: ```js javascript:(function(){var id='add-alt-text-overlay';var s=document.getElementById(id); if(s){s.parentNode.removeChild(s)}else{s=document.createElement('style');s.id=id;s.innerHTML='div[data-testid="tweetPhoto"]:not([aria-label="Image"]),div[data-testid="previewInterstitial"]:not([aria-label="Embedded video"]){margin:0!important;}div[data-testid="tweetPhoto"]:hover:not([aria-label="Image"]):after,div[data-testid="previewInterstitial"]:hover:not([aria-label="Embedded video"]):after{content:attr(aria-label);background:rgba(0,0,0,.75);color:#fff;padding:10px;font-family:sans-serif;line-height:130%;z-index:1;overflow:auto;}';document.head.appendChild(s);}})(); ```