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Fix backdrop-filter with invalid mask image issue #57084

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Merged
chromium-wpt-export-bot merged 1 commit into from
Jan 8, 2026
Merged

Fix backdrop-filter with invalid mask image issue #57084

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25 changes: 25 additions & 0 deletions css/css-masking/mask-image/backdrop-filter-bad-mask-image.html
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Backdrop-filter with invalid mask-image URL</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-image">
<link rel="match" href="about:blank">

<style>
.backdrop-filter {
backdrop-filter: invert(1);
background-color: rgba(255, 255, 255, 0.5);
}

.bad-mask {
/* This invalid mask-image should fully-mask this element. */
mask-image: url("invalid://nonexistent");
}

.double-mask {
/* Multiple invalid mask layers: all invalid, element should be fully masked. */
mask-image: url("invalid://nonexistent"), url("invalid://nonexistent");
}
</style>

<p class="backdrop-filter bad-mask">Backdrop-filter with invalid mask-image</p>
<p class="backdrop-filter double-mask">Backdrop-filter with two invalid mask-image</p>
17 changes: 17 additions & 0 deletions css/css-masking/mask-image/backdrop-filter-good-and-bad-mask-image-ref.html
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Reference for backdrop-filter with invalid mask-image URL</title>

<style>
body {
background-color: yellow;
}

/* Reference for backdrop-filter only - should show inverted background */
.backdrop-filter {
backdrop-filter: invert(1);
background-color: rgba(255, 255, 255, 0.5);
}
</style>

<p class="backdrop-filter double-mask">Backdrop-filter with double mask-image</p>
23 changes: 23 additions & 0 deletions css/css-masking/mask-image/backdrop-filter-good-and-bad-mask-image.html
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Backdrop-filter with invalid mask-image URL</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-image">
<link rel="match" href="backdrop-filter-good-and-bad-mask-image-ref.html">

<style>
body {
background-color: yellow;
}

.double-mask {
/* Multiple mask layers: invalid mask is ignored, valid mask takes effect. */
mask-image: url("invalid://nonexistent"), linear-gradient(black, black);
}

.backdrop-filter {
backdrop-filter: invert(1);
background-color: rgba(255, 255, 255, 0.5);
}
</style>

<p class="backdrop-filter double-mask">Backdrop-filter with double mask-image</p>
19 changes: 19 additions & 0 deletions css/css-masking/mask-image/backdrop-filter-mask-image-while-loading.html
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<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>Backdrop-filter with mask image remains hidden while loading</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-image">
<link rel="match" href="about:blank">

<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>

<p id="target" style="backdrop-filter: invert(1); background-color: rgba(255, 255, 255, 0.5);">Backdrop-filter with
a loading mask-image</p>
<script>
onload = () => {
const p = document.getElementById('target');
p.style.maskImage = `url("support/transparent-100x50-blue-100x50.svg?pipe=trickle(d10)")`;
waitForAtLeastOneFrame().then(takeScreenshot);
};
</script>
16 changes: 16 additions & 0 deletions css/css-masking/mask-image/bad-mask-image-svg.html
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<!DOCTYPE html>
<meta charset="utf-8">
<title>SVG with invalid mask-images</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-image">
<link rel="match" href="about:blank">

<style>
svg > rect {
/* Multiple invalid mask layers: all invalid, SVG element should be fully masked. */
mask-image: url("invalid://nonexistent"), url("invalid://nonexistent");
}
</style>

<svg>
<rect width="50" height="100" fill="green" />
</svg>
14 changes: 14 additions & 0 deletions css/css-masking/mask-image/bad-mask-image.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
<!DOCTYPE html>
<meta charset="utf-8">
<title>Invalid mask-image URL</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-image">
<link rel="match" href="about:blank">

<style>
.bad-mask {
/* This invalid mask-image should fully-mask this element. */
mask-image: url("invalid://nonexistent");
}
</style>

<p class="bad-mask">Invalid mask-image</p>