I've seen this question: Lazy loading images and effects on SEO
My question is very similar, except that I am using data-uri images like so:
<img width="1100" height="340" class="img-responsive lazy lazy-hidden" src="data:image/png;base64,iVBORw0KGgoAAAANS ... " data-src="//example.com/epic-cat-fails-omg.png" alt="" >
Each lazy-load image has a unique data uri to create a specific-sized transparent image. What should I put in the alt tag for SEO? Anything? Nothing? Does Google even bother with data-uri images?
(Or should I use a proper description, and use the
<noscript> tag to put the actual
<img> with the exact same description? I'm in the dark on this.)