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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests transitioning display property of anchored popover</title>
<link rel="help" href="https://github.com/whatwg/html/pull/9144">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
margin: 0;
}
#target {
inset: auto;
transition: display 2s;
}
</style>
<div popover anchor id="target">
Popover
</div>
<script>
test(() => {
target.showPopover();
const xBefore = target.offsetLeft;
const yBefore = target.offsetTop;
target.hidePopover();
assert_equals(target.offsetLeft, xBefore, 'Should not shift in x axis');
assert_equals(target.offsetTop, yBefore, 'Should not shift in y axis')
}, 'Transitioning display property of an anchored popover should not cause a position shift');
</script>