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<!DOCTYPE HTML>
<html style="overflow: hidden;">
<head>
<title>Test that scaled elements with scrolled contents don't repaint unnecessarily when we scroll inside them</title>
<script src="/tests/SimpleTest/paint_listener.js"></script>
</head>
<!-- Need a timeout here to allow paint unsuppression before we start the test -->
<body onload="setTimeout(startTest,0)" style="background:white;">
<iframe id="t" style="transform: scale(0.48979); transform-origin:top left; width:500px; height:600px;"
src="transformed_scrolling_repaints_3_window_frame.html">
</iframe>
<pre id="test">
<script type="application/javascript">
var SimpleTest = window.opener.SimpleTest;
var SpecialPowers = window.opener.SpecialPowers;
var is = window.opener.is;
var smoothScrollPref = "general.smoothScroll";
function startTest() {
SpecialPowers.pushPrefEnv({"set":[[smoothScrollPref, false]]}, runTest);
}
async function runTest() {
let t = document.getElementById("t");
let e = t.contentDocument.getElementById("e");
t.contentWindow.scrollTo(0,0);
let utils = SpecialPowers.getDOMWindowUtils(window);
for (let i = 0; i < 15; i++) {
let painted = utils.checkAndClearPaintedState(e);
// We ignore the first few scrolls, to ensure we have triggered activity
// heuristics.
if (i >= 5) {
is(painted, false,
"Fully-visible scrolled element should not have been painted");
}
t.contentWindow.scrollByLines(1);
await promiseAllPaintsDone(null, true);
}
SimpleTest.finish();
window.close();
}
</script>
</pre>
</body>
</html>
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