Autofocus element in a <dialog> tries to get focus twice #4788
Description
The following code shows FOCUS log twice.
<!DOCTYPE html>
<pre></pre>
<dialog>
<input autofocus onfocus="log()">
<a href="http://www.google.com/">Help</a>
</dialog>
<script>
function log() {
document.querySelector('pre').textContent += 'FOCUS\n';
}
document.querySelector('dialog').show();
document.activeElement.blur();
</script>- The HTML parser inserts the
inputto the document tree, and it posts the autofocus task. dialog.show()sets focus on theinputsynchronously.- When the task is executed, the
inputis focused again.