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Test Info:

<!doctype HTML>
<html>
<meta charset="utf8">
<title>Display Locking: focus on styled element</title>
<link rel="author" title="Rakina Zata Amni" href="mailto:rakina@chromium.org">
<meta name="assert" content="focus does not target display-none but hidden elements">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="container" style="content-visibility: auto">
<div id="focusable1" tabIndex="0">
focusable thing
</div>
<div id="displayNoneParent">
<div id="focusable2" tabIndex="0">
focusable thing
</div>
</div>
</div>
<script>
test(() => {
focusable1.style.display = "none";
focusable1.focus();
assert_not_equals(document.activeElement, focusable1);
displayNoneParent.style.display = "none";
focusable2.focus();
assert_not_equals(document.activeElement, focusable2);
}, "Trying to focus on an element in a hidden subtree with display none will not work");
</script>
</html>