Andrea Fercia b853e21bf9 Accessibility: Improve the differences between revisions.
Color alone is not sufficient to visually communicate differences.

- adds `plus` and `minus` icons to the changed lines
- adds visually hidden text: `Added`, `Deleted`, and `Unchanged` to clarify the differences to assistive technologies users

Props birgire, audrasjb, kjellr, adamsilverstein.
Fixes #43532.

Built from https://develop.svn.wordpress.org/trunk@45729


git-svn-id: http://core.svn.wordpress.org/trunk@45540 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-08-03 15:46:54 +00:00
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