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layout: Support content: <image> on non-pseudo-elements #56912

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layout: Support content: <image> on non-pseudo-elements #56912

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29ff505
Add new WPT tests for replacing the document root
andreubotella Dec 30, 2025
93ddd6d
Fix box tree invalidation bug
andreubotella Dec 30, 2025
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13 changes: 9 additions & 4 deletions css/css-content/element-replacement-dynamic.html
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Original file line number Diff line number Diff line change
@@ -1,10 +1,14 @@
<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>The content CSS attribute can replace an element's contents dynamically</title>
<link rel="author" title="Oriol Brufau" href="mailto:[email protected]" />
<link rel="match" href="element-replacement-ref.html" />
<link rel="help" href="https://drafts.csswg.org/css-content-3/#content-property" />
<meta name="assert" content"This test checks that the CSS content propertly can replace a normal element's contents when changed dynamically" />
<meta name="assert" content="This test checks that the CSS content propertly can replace a normal element's contents when changed dynamically" />

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

<style>
#target {
Expand All @@ -18,7 +22,8 @@
<div id="target">This text should not be visible</div>

<script>
const target = document.getElementById("target");
getComputedStyle(target).width;
target.className = "replaced";
waitForAtLeastOneFrame().then(() => {
document.getElementById("target").className = "replaced";
takeScreenshot();
});
</script>
17 changes: 17 additions & 0 deletions css/css-content/element-replacement-root-canvas-bg-from-body.html
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@@ -0,0 +1,17 @@
<!DOCTYPE html>
<title>When content CSS attribute can replace a document's root, the HTML body element's background does not become the canvas background</title>
<link rel="match" href="element-replacement-root-ref.html" />
<link rel="help" href="https://drafts.csswg.org/css-content-3/#content-property" />
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#body-background" />
<meta name="assert" content="When the content CSS attribute replaces a document's root, its contents do not create boxes, so the HTML body element's background can't affect the canvas background." />

<style>
:root {
content: url('resources/rect.svg');
}
body {
background-color: aquamarine;
}
</style>

<p>This text should not be visible</p>
13 changes: 13 additions & 0 deletions css/css-content/element-replacement-root-canvas-bg-ref.html
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@@ -0,0 +1,13 @@
<!doctype html>
<title>Reference for the content CSS attribute can replace a document's root</title>

<style>
:root {
background-color: aquamarine;
}
body {
margin: 0;
}
</style>

<img src="resources/rect.svg" />
15 changes: 15 additions & 0 deletions css/css-content/element-replacement-root-canvas-bg.html
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@@ -0,0 +1,15 @@
<!DOCTYPE html>
<title>When content CSS attribute can replace a document's root, its canvas still becomes the canvas background</title>
<link rel="match" href="element-replacement-root-canvas-bg-ref.html" />
<link rel="help" href="https://drafts.csswg.org/css-content-3/#content-property" />
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#root-background" />
<meta name="assert" content="When the content CSS attribute replaces a document's root, it does not affect the fact that the root's background becomes the canvas background" />

<style>
:root {
content: url('resources/rect.svg');
background-color: aquamarine;
}
</style>

<p>This text should not be visible</p>
10 changes: 10 additions & 0 deletions css/css-content/element-replacement-root-ref.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
<!doctype html>
<title>Reference for the content CSS attribute can replace a document's root</title>

<style>
body {
margin: 0;
}
</style>

<img src="resources/rect.svg" />
13 changes: 13 additions & 0 deletions css/css-content/element-replacement-root.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
<!DOCTYPE html>
<title>The content CSS attribute can replace a document's root</title>
<link rel="match" href="element-replacement-root-ref.html" />
<link rel="help" href="https://drafts.csswg.org/css-content-3/#content-property" />
<meta name="assert" content="This test checks that the CSS content propertly can replace the contents of a document's root" />

<style>
:root {
content: url('resources/rect.svg');
}
</style>

<p>This text should not be visible</p>