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LibWeb: Only invalidate stacking context tree for opacity/z-index change

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I came across some websites that change an elements CSS "opacity" in
their :hover selectors. That caused us to relayout on hover, which we'd
like to avoid.

With this patch, we now check if a property only affects the stacking
context tree, and if nothing layout-affecting has changed, we only
invalidate the stacking context tree, causing it to be rebuilt on next
paint or hit test.

This makes :hover { opacity: ... } rules much faster. :^)
This commit is contained in:
Andreas Kling 2022-03-21 10:58:51 +01:00
parent 59afdb959f
commit 8c88ee1165
6 changed files with 54 additions and 0 deletions
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4
Userland/Libraries/LibWeb/CSS/Properties.json
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@ -1034,6 +1034,8 @@
]
},
"opacity": {
"affects-layout": false,
"affects-stacking-context": true,
"inherited": false,
"initial": "1",
"valid-types": [
@ -1459,6 +1461,8 @@
]
},
"z-index": {
"affects-layout": false,
"affects-stacking-context": true,
"inherited": false,
"initial": "auto",
"valid-types": [