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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<script>
let pp;
window.addEventListener("MozReftestInvalidate", finish);
function go() {
let c = document.createElement("frameset");
document.documentElement.appendChild(c);
document.onscroll = () => {
try {
pp = SpecialPowers.wrap(window).printPreview();
pp?.close();
} catch (e) {}
setTimeout(finish,0);
};
window.scrollBy(0, 10);
}
window.addEventListener("load", go);
let num = 0;
function finish() {
num++;
if (num < 2) {
return;
}
setTimeout(function() {
try {
pp?.close();
} catch (e) {}
document.documentElement.removeAttribute("class");
}, 0);
}
</script>
</html>