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LibWeb: Use offset of nearest scrollable ancestor for positioned boxes

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Because positioned descendants are painted out-of-order we need to
separately apply offset of nearest scrollable box for them.

Fixes https://github.com/SerenityOS/serenity/issues/20554
This commit is contained in:
Aliaksandr Kalenik 2023-12-11 16:57:47 +01:00 • committed by Andreas Kling
parent 2952f01e84
commit 6b79508c08
5 changed files with 167 additions and 0 deletions
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71
Tests/LibWeb/Ref/reference/positioned-elements-in-scroll-container-ref.html Normal file
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<html>
<link rel="match" href="reference/positioned-elements-in-scroll-container-ref.html" />
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html {
height: 100%;
position: relative;
}
body {
height: 100%;
}
article {
overflow-x: scroll;
overflow-y: scroll;
width: 500px;
height: 500px;
border: 1px solid black;
z-index: 1;
}
.card {
margin: 2rem;
height: 30rem;
background-color: #bbb;
}
</style>
<main>
<article id="scrollcontainer">
<h1>Fly away to victory!</h1>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
deserunt mollit anim id est laborum.
</p>
<div class="card">A card!</div>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
deserunt mollit anim id est laborum.
</p>
</article>
</main>
<script>
const scrollContainer = document.getElementById("scrollcontainer");
scrollContainer.scrollTop = 100;
</script>
</html>