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Test Info:

<!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" />
<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>