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Test Info:

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<body>
<div popover id="popover"></div>
<script>
test(() => {
popover.showPopover();
let keydown = new KeyboardEvent("keydown", {key: "Escape", keyCode: 27});
document.body.dispatchEvent(keydown);
let keyup = new KeyboardEvent("keyup", {key: "Escape", keyCode: 27});
document.body.dispatchEvent(keyup);
assert_true(popover.matches(':popover-open'));
let keyup2 = document.createEvent("Event");
keyup2.initEvent("keyup", true);
document.body.dispatchEvent(keyup2);
assert_true(popover.matches(':popover-open'));
}, "close via synthesized Esc key must not work");
</script>