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sousa-gecko/testing/web-platform/tests/css/cssom-view/scrollTo-zoom.html
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Manuel Rego Casasnovas e05b6407f9 Bug 1952354 [wpt PR 51176] - Round scroll offsets in Blink, a=testonly
Automatic update from web-platform-tests
Round scroll offsets in Blink

In CC ScrollTree::PullDeltaForMainThread() is rounding
the scroll offsets, while in SnapScrollOffsetToPhysicalPixels()
we are flooring them.

This patch rounds the scroll offsets in Blink, to avoid situations
where we have a 1 pixel difference.

Bug: 352722599
Test: external/wpt/css/cssom-view/scrollTo-zoom.html
Change-Id: I10ae5136b183d80d6b5d1db8af37c92d1714f79b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6328500
Reviewed-by: David Bokan <bokan@chromium.org>
Auto-Submit: Manuel Rego <rego@igalia.com>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Manuel Rego <rego@igalia.com>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1429089}

--

wpt-commits: ccbb42938d1377473b636aeae838af627a382b77
wpt-pr: 51176
2025-03-17 09:46:12 +00:00

46 lines
1.2 KiB
HTML

<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollto">
<link rel="match" href="../reference/ref-nothing-below.xht" />
<meta name="assert" content="This test checks scrollTo() with different zoom levels.">
<style>
.container {
position: relative;
width: 100px;
height: 100px;
overflow: scroll;
background: red;
scrollbar-width: none;
}
.container > div {
position: absolute;
left: 13px;
top: 27px;
width: 100px;
height: 100px;
background: white;
}
</style>
<body style="background: white;">
<p>Test passes if there is nothing below.</p>
<div class="container" style="zoom: 0.9;">
<div></div>
</div>
<div class="container" style="zoom: 1;">
<div></div>
</div>
<div class="container" style="zoom: 1.11;">
<div></div>
</div>
<div class="container" style="zoom: 1.5;">
<div></div>
</div>
<script>
Array.prototype.forEach.call(document.getElementsByClassName("container"), (el) => {
el.scrollTo(13, 27);
});
</script>
</body>