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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test that scaled elements with scrolled contents don't repaint unnecessarily when we scroll inside them</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body onload="setPrefAndStartTest()">
+<div id="t" style="-moz-transform: scale(1.2, 1.2); -moz-transform-origin:top left; width:200px; height:500px; background:yellow; overflow:auto">
+ <div style="height:40px;">Hello</div>
+ <div id="e" style="height:30px; background:lime">Kitty</div>
+ <div style="height:800px; background:yellow">Kitty</div>
+</div>
+<pre id="test">
+<script type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var t = document.getElementById("t");
+var e = document.getElementById("e");
+var utils = SpecialPowers.getDOMWindowUtils(window);
+
+function startTest() {
+ // Do a couple of scrolls to ensure we've triggered activity heuristics.
+ waitForAllPaintsFlushed(function () {
+ t.scrollTop = 5;
+ waitForAllPaintsFlushed(function () {
+ t.scrollTop = 10;
+ waitForAllPaintsFlushed(function () {
+ // Clear paint state now and scroll again.
+ utils.checkAndClearPaintedState(e);
+ t.scrollTop = 15;
+ waitForAllPaintsFlushed(function () {
+ var painted = utils.checkAndClearPaintedState(e);
+ is(painted, false, "Fully-visible scrolled element should not have been painted");
+ SimpleTest.finish();
+ });
+ });
+ });
+ });
+}
+function setPrefAndStartTest() {
+ SpecialPowers.pushPrefEnv(
+ {"set": [["layers.single-tile.enabled", false]]},
+ // Need a timeout here to allow paint unsuppression before we start the test
+ function() {
+ setTimeout(startTest, 0);
+ }
+ );
+}
+</script>
+</pre>
+</body>
+</html>