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Improve logic for establishing a stacking context (#35947)

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In particular:
 - `z-index` will now work on unpositioned grid items.
 - `will-change: z-index` will only establish a stacking context if
   `z-index` applies, i.e. if the box is positioned or a flex/grid item.
 - The conditions in `establishes_stacking_context()` are reordered,
   so that the most likely ones are checked first.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
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Oriol Brufau 2025-03-13 07:49:08 +01:00 • committed by GitHub
parent 205b97d5ed
commit f93006af95
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33 changed files with 233 additions and 114 deletions
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tests/wpt/meta/css/css-will-change/will-change-stacking-context-z-index-3.html.ini vendored Normal file
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[will-change-stacking-context-z-index-3.html]
prefs: ["layout_grid_enabled:true"]