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<!doctype html>
<meta charset="utf-8">
<title>:has(:focus) doesn't cause focusability to be lost</title>
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
<link rel="help" href="https://bugzil.la/1983421">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
.submenu {
display: none;
}
#container:has(:focus) > .submenu {
display: block;
}
</style>
<div id="container">
<button id="first">A</button>
<div class="submenu">
<button id="second">B</button>
</div>
</div>
<script>
promise_test(async t => {
let first = document.getElementById("first");
let second = document.getElementById("second");
assert_equals(second.getBoundingClientRect().height, 0, "#second has no box");
first.focus();
assert_equals(document.activeElement, first, "#first is focused");
assert_not_equals(second.getBoundingClientRect().height, 0, "#second is displayed");
const kTab = '\uE004';
await new test_driver.Actions()
.keyDown(kTab)
.keyUp(kTab)
.send();
assert_equals(document.activeElement, second, "Focus can move to #second");
});
</script>
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