disable-apz-for-sle-pages.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html class="reftest-wait reftest-snapshot-all reftest-no-flush" reftest-async-scroll

      reftest-async-scroll-y="200">

 <head>

  <title>Check that the apz.disable_for_sle_pages pref behaves as expected</title>

  <script>

    // Upon load, this page invokes scrollTo() for a transparent element

    // repeatedly. It triggers scroll events, which run the scroll listener

    // below. The scroll listener updates the background-position-x of the div

    // to make the div a scroll-linked-effect. The scroll-linked effect detector

    // should then report that the document contains such an effect, which will

    // disable APZ on the page. That in turn will cause the

    // reftest-async-scroll-y to get ignored, and that's what the reftest checks

    // for.

    function start() {

        let scrollPosition = 1;

        scroller.addEventListener('scroll', function() {

            // NOTE: Changing background-position-x doesn't change rendering for

            // this element.

            document.getElementById('scroll-linked-effect').style.backgroundPositionX =

                scroller.scrollTop + "px";

            if (scrollPosition == 1) {

              setTimeout(done, 0);

            scrollPosition++;

            scroller.scrollTo(0, scrollPosition);

});

        scroller.scrollTo(0, scrollPosition);

    addEventListener('load', start, false);

    function done() {

        document.documentElement.classList.remove('reftest-wait');

  </script>

 </head>

 <body style="height: 5000px; background-image:url(repeatable-diagonal-gradient.png);">

  <div id="scroller" style="overflow: auto; width: 100px; height: 100px; scrollbar-width: none;">

    <div style="height: 5000px;"></div>

  </div>

  <div id="scroll-linked-effect" style="position: absolute; top: 100px; left: 100px; width: 100px; height: 100px; background-color: green"></div>

 </body>

</html>