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LibWeb: Ensure preceding offset is non-negative in float_box()

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When calculating the edge offset of the next floating item based on the
offset of the preceding floating item, we need to ensure that the
preceding offset is always > 0. This isn't explicitly written in the
spec, but all other popular engines do that.

Fixes https://github.com/SerenityOS/serenity/issues/21023
This commit is contained in:
Aliaksandr Kalenik 2023-09-12 00:58:51 +02:00 • committed by Andreas Kling
parent 81ddad3fcf
commit d1e542999c
3 changed files with 51 additions and 1 deletions
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22
Tests/LibWeb/Layout/input/block-and-inline/floats-with-negative-percentage-margins.html Normal file
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@ -0,0 +1,22 @@
<!DOCTYPE html><style>
* { outline: 1px solid black; }
body { width: 600px; }
div {
width: 100px;
height: 100px;
float: left;
}
#top {
background: green;
}
#left {
background: pink;
margin-right: -100%;
clear: both;
}
#right {
background: orange;
margin-left: 200px;
margin-right: -100%;
}
</style><body><div id="top">top</div><div id="left">left</div><div id="right">right