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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-overflow/overflow-body-propagation-015.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: two BODY elements</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<meta name="assert" content="If there are multiple <body> elements, the
one that propagates `overflow` to the viewport is the first one.
Here we insert a cloned body before the original one, so the original
needs to stop propagating because the clone will do it instead.
Therefore, the cloned <body> should get `overflow: visible` and its
overflowing contents should be visible. And the original <body> should
be able to keep `overflow: hidden` and hide its overflowing contents.">
<link rel="match" href="overflow-body-propagation-012-ref.html">
<style>
body {
overflow: hidden;
width: 0px;
height: 0px;
border: solid green;
border-width: 0 400px 200px 0;
margin-bottom: 0;
}
body:not(#clone) {
margin-top: 0;
}
body > div {
background: red;
width: 400px;
height: 200px;
}
#clone {
border-color: red;
margin-top: revert;
}
#clone > div {
background: green;
}
</style>
<body>
<div></div>
</body>
<script>
let clone = document.body.cloneNode(true);
clone.id = "clone";
document.documentElement.prepend(clone);
</script>