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-rw-r--r--layout/reftests/async-scrolling/disable-apz-for-sle-pages.html46
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diff --git a/layout/reftests/async-scrolling/disable-apz-for-sle-pages.html b/layout/reftests/async-scrolling/disable-apz-for-sle-pages.html
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+++ b/layout/reftests/async-scrolling/disable-apz-for-sle-pages.html
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+<!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>