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Test Info:

<!doctype html>
<meta charset=utf-8>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin: 0 }
dialog {
width: 100%;
height: 100%;
max-width: 100%;
max-height: 100%;
box-sizing: border-box;
padding: 0;
}
dialog::backdrop {
display: none;
}
</style>
<dialog id=dialog>Something</dialog>
<script>
test(function() {
let dialog = document.getElementById("dialog");
dialog.showModal();
assert_equals(
document.elementFromPoint(10, 10),
dialog,
"Dialog is hittable by default",
);
dialog.inert = true;
assert_not_equals(
document.elementFromPoint(10, 10),
dialog,
"Dialog becomes inert dynamically",
);
dialog.close();
dialog.showModal();
assert_not_equals(
document.elementFromPoint(10, 10),
dialog,
"Dialog remains inert after open",
);
});
</script>