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LibWeb: Align to padding edge only auto positioned abspos grid items

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Containing block for abspos grid items depends on their grid placement:
- if element has definite grid position, then corresponding grid area
  should be used as a containing block
- if element does not have definite grid position, then padding edge of
  grid container should be used as a containing block

So offset should be adjusted for paddings only for boxes without
definite grid position.
This commit is contained in:
Aliaksandr Kalenik 2024-09-21 19:31:27 +02:00 • committed by Andreas Kling
commit 19afc5b11b
Notes: github-actions[bot] 2024-09-21 18:11:49 +00:00
3 changed files with 61 additions and 3 deletions
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32
Tests/LibWeb/Layout/input/grid/abspos-item-with-padding.html Normal file
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<!DOCTYPE html><style>
* {
border: 1px solid black;
}
.grid {
display: grid;
grid-template-columns: 100px 100px;
grid-template-areas: "a b";
position: relative;
width: 200px;
height: 100px;
padding-top: 100px;
}
.abspos-item-with-grid-area {
position: absolute;
top: 0;
left: 0;
width: 50px;
height: 50px;
grid-area: a;
}
.abspos-item-with-auto-placement {
position: absolute;
top: 0;
left: 0;
width: 50px;
height: 50px;
}
</style><div class="grid"><div class="abspos-item-with-grid-area">A</div><div class="abspos-item-with-auto-placement">B</div></div>