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<!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>