Commits on Feb 17, 2023

1. Rip out all of the beautiful bespoke Popover animation stuff …

   This isn't part of the landed spec [1], and will be replaced by
   a combination of these five CSSWG issues:
   
   - w3c/csswg-drafts#4441
   - w3c/csswg-drafts#6429
   - w3c/csswg-drafts#8174
   - w3c/csswg-drafts#8189
   - w3c/csswg-drafts#8389
   
   After this CL, you will no longer be able to animate your
   popover like this:
   
   ```
     [popover] {
       opacity: 0;
       transition: opacity 0.2s;
     }
     [popover]:open {
       opacity: 1;
     }
   ```
   
   Instead you'll need to use CSS animations or (eventually) transitions
   and you'll have to explicitly declare the `display` and `top-layer`
   properties:
   
   ```
     transition: opacity 0.2s, display 0.2s, top-layer 0.2s;
   ```
   
   [1] https://html.spec.whatwg.org/multipage/popover.html
   
   Bug: 1307772,1413556
   Change-Id: I4877dd69a06f2624bdb463b065b2e2b66cbf1154
   Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4225730
   Reviewed-by: David Baron <dbaron@chromium.org>
   Commit-Queue: David Baron <dbaron@chromium.org>
   Commit-Queue: Mason Freed <masonf@chromium.org>
   Auto-Submit: Mason Freed <masonf@chromium.org>
   Cr-Commit-Position: refs/heads/main@{#1107048}

   

   Mason Freed authored and chromium-wpt-export-bot committed Feb 17, 2023
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