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layout: Do not include position:fixed children when calculating scrollable overflow for root element (#38618)

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Reimplementation of: #35931

For a `FragmentTree` we define a scrollable overflow calculation that
includes the overflow all of it's children `Fragments`. In practice we
are using this calculation for scrolling area of the viewport and
defining the root scroll frames. However, since uncontained fixed
positioned element is located outside of the document and should not be
scrolled, and therefore it would make no sense to include them in the
calculation of its scrollable overflow as well.

Testing: New and existing WPT tests
Fixes: #38617
Fixes: #38182

---------

Signed-off-by: Jo Steven Novaryo <jo.steven.novaryo@huawei.com>
This commit is contained in:
Jo Steven Novaryo 2025-08-18 19:25:31 +08:00 • committed by GitHub
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4 changed files with 58 additions and 5 deletions
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7
tests/wpt/meta/MANIFEST.json vendored
View file

@ -607585,6 +607585,13 @@
}
]
],
"scrollable-overflow-fixed-positioned-initial-containing-block.html": [
"10f115a012a85230a4641a1d793c0a6df0db2e78",
[
null,
{}
]
],
"scrollable-overflow-float.html": [
"f75c0a66cfffdfe9872c6e472966ee3cf639eae6",
[

2
tests/wpt/meta/css/css-masking/clip-path/clip-path-fixed-scroll.html.ini vendored
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@ -1,2 +0,0 @@
[clip-path-fixed-scroll.html]
expected: FAIL

30
tests/wpt/tests/css/css-overflow/scrollable-overflow-fixed-positioned-initial-containing-block.html vendored Normal file
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@ -0,0 +1,30 @@
<!DOCTYPE html>
<html>
<head>
<title>Scrollable overflow of Document element with 'position: fixed' which has ICB as containing block</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow/#scrollable">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollwidth">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollheight">
<link rel="author" title="Jo Steven Novaryo" href="mailto:jo.steven.novaryo@huawei.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
</body>
<script>
promise_test(async (t) => {
let initialScrollHeight = document.scrollingElement.scrollHeight;
let initialScrollWidth = document.scrollingElement.scrollWidth;
let fixedDiv = document.createElement("div");
fixedDiv.style.position = "fixed";
fixedDiv.style.height = (initialScrollHeight * 2) + "px";
fixedDiv.style.width = (initialScrollWidth * 2) + "px";
document.body.appendChild(fixedDiv);
assert_equals(document.scrollingElement.scrollHeight, initialScrollHeight);
assert_equals(document.scrollingElement.scrollWidth, initialScrollWidth);
}, "position: fixed fixed with ICB as CB should not affect scrollable overflow of Document element.");
</script>
</html>