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Test Info:

<!DOCTYPE html>
<button id="b">click</button>
<div id="p" popover="auto"><input autofocus></div>
<script>
document.getElementById('b').focus();
document.getElementById('p').showPopover();
document.getElementById('b').addEventListener('focus', () => {
document.getElementById('p').removeAttribute('popover');
});
document.getElementById('p').hidePopover();
</script>