We have some sprites in core and we'll have more:
#851496: Invalid to use the CSS background to display non-background images in Forum →
#821672: Forum icons not accessible to screen-reader users →
#1849078: Replace many toolbar icon files with a single CSS sprite image →
#565752: Core images (i.e. images in /misc) should use CSS sprites →
There are some new best practices that should be considered
http://www.paciellogroup.com/blog/2012/08/notes-on-accessible-css-image-...
http://openweb.eu.org/articles/performances_web_les_sprites_CSS
And how we approach this needs to be consistent so that it is easy for modules to adopt this best practice moving forward.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Might want to consider moving to SVG sprites
https://www.sitepoint.com/use-svg-image-sprites/
https://css-tricks.com/svg-sprites-use-better-icon-fonts/
There are definitely language and accessibility challenges though.
One way around this is:
https://upload.wikimedia.org/wikipedia/commons/1/1e/Multilingual_SVG_exa...
https://developer.mozilla.org/en-US/docs/Web/SVG/Element/switch#SVG_%3Cs...
But that doesn't cover title/desc.
