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LibWeb: Move z-index to table wrapper box

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When drawing a table, some of the CSS properties must be moved from the
table grid box to an anonamyous table wrapper box. One of these
properties is `position`. `z-index` however is not. This leads to the
following behavior if a table has both `position` and `z-index`:
* The wrapper box has the `position`, but a `z-index` of `auto`.
* The grid box has the `z-index`, but `position: static`.

This effectively means that the `z-index property is ignored since it
has no effect on non-positioned elements. This behavior contradicts what
other browsers do and causes layout issues on websites.

To align Ladybird behavior with other browser this commit also moves the
`z-index` property to the wrapper box.
This commit is contained in:
InvalidUsernameException 2025-02-15 16:58:35 +01:00 • committed by Alexander Kalenik
commit 29d74632c7
Notes: github-actions[bot] 2025-02-16 20:07:02 +00:00
4 changed files with 82 additions and 0 deletions
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26
Tests/LibWeb/Ref/expected/tables-width-z-index-ref.html Normal file
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<!DOCTYPE html>
<style>
div {
background-color: green;
position: fixed;
width: 100px;
height: 100px;
}
.offset-0 { top: 10px; }
.offset-1 { top: 120px; }
.offset-2 { top: 230px; }
.offset-3 { top: 340px; }
.offset-4 { top: 450px; }
.offset-5 { top: 560px; }
.offset-6 { top: 670px; }
.offset-7 { top: 780px; }
</style>
<div class="offset-0"></div>
<div class="offset-1"></div>
<div class="offset-2"></div>
<div class="offset-3"></div>
<div class="offset-4"></div>
<div class="offset-5"></div>
<div class="offset-6"></div>
<div class="offset-7"></div>