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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="utf-8">
<title>CSS Test: :focus-within selector</title>
<link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<meta name="assert" content="Test checks :focus-within should not work for iframe">
<link rel="match" href="focus-within-013-ref.html">
<style>
div:focus-within {
border: solid 15px red;
}
iframe:focus-within {
border: solid 15px red;
}
</style>
</head>
<body>
<p>Test passes if, when the element inside the iframe is focused, there is no red border surrounded.</p>
<div>
<iframe id="iframe" src="focus-within-1.html" width="300px" height="300px" frameborder="0" tabindex="1"><p>Your browser does not support iframes.</p></iframe>
</div>
<script>
var iframe = document.getElementById("iframe");
iframe.addEventListener("load", function() {
while (iframe.contentWindow.document.documentElement.classList.contains("reftest-wait")) {}
document.documentElement.classList.remove('reftest-wait');
});
</script>
</body>
</html>