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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/8389">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<dialog>
<button>button</button>
</dialog>
<style>
dialog.ready {
transition: display 500ms;
}
</style>
<script>
promise_test(async () => {
const dialog = document.querySelector('dialog');
const button = document.querySelector('button');
dialog.showModal();
button.blur(); // Dialog initial focus focused the button
dialog.classList.add('ready');
dialog.close();
await new Promise(resolve => requestAnimationFrame(resolve));
button.focus();
assert_not_equals(document.activeElement, button, 'Inert elements should not be focusable.');
}, 'Elements which are transitioning to display:none should be inert.');
</script>
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