Currently only <img src="..."> is recognized. Responsive images allow <img srcset="..."> as well as <source srcset="...">, both of which could contain multiple URLs. isImagePreviewTarget and isPreviewable in markup.js look like a reasonable place to start updating this logic. After that it's probably necessary to chase the getImageData implementation that's called from _getPreview.
This has already been filed under bug 1064715.
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1064715
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