Simplify our css in using :is or :where

[calixteman]

For reference:

• https://developer.mozilla.org/en-US/docs/Web/CSS/:is
• https://developer.mozilla.org/en-US/docs/Web/CSS/:where

[Snuffleupagus]

Do you have any examples of CSS rules that would benefit from such a re-factoring?

Also, please note that this would require bumping the minimum supported Google Chrome version; see #16192 (comment).

[calixteman]

For example:

pdf.js/web/viewer.css

Line 330 in f39ff20

.toolbar input,

Probably few others for annotations.

I didn't know either :is or :where before today.

[tymnec]

Assign this issue to me I will simplify viewer.css

[Snuffleupagus]

Sorry, but this may not be an ideal beginner bug without any prior PDF.js experience (given that any changes require careful manual testing). Furthermore, as outlined in #16194 (comment) this potentially applies to all our CSS-files (and not just one).

[Snuffleupagus]

Once all of the PRs linked above are merged, I think that it'll be reasonable to consider this issue fixed :-)