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Test Info: Errors

<html class="reftest-wait">
<script>
let pp;
let documentElements = [];
documentElements.push(document.documentElement);
window.onload = () => {
documentElements.push(document.documentElement);
let o = document.getElementById('a')
o.parentNode.appendChild(o)
pp = SpecialPowers.wrap(self).printPreview();
pp?.print()
window.requestIdleCallback(() => {
documentElements.push(document.documentElement);
document.write('');
setTimeout(finish, 100);
});
}
function finish() {
// The printPreview call above actually opens two print preview windows
// because the <embed src='#'> below causes a second one to open. At least
// we close the one window we can access, not sure if there is a way to get
// ahold of the other window to close it. So this test leaves a window open
// after it finishes.
try { pp.close(); } catch (e) {}
if (document.documentElement) {
try { document.documentElement.className = ""; } catch (e) {}
}
// The documentElement that the reftest harness looks at to determine if the
// test is done is not what document.documentElement points to when this code
// is run. So we save all the document.documentElement's we encounter while
// running this test and clear all of their class names.
for (let de of documentElements) {
if (de) {
try {
de.className = "";
} catch (e) {}
}
}
}
</script>
<style>
:first-of-type { padding-block-start: 99% }
</style>
<mark id='a'>
<embed src='#'>
</html>