<!DOCTYPE html>
<html>
<head>
<script src="resources/text-based-repaint.js"></script>
<style>
#scroller {
position: absolute;
left: 10px;
top: 60px;
height: 400px;
overflow: scroll;
width: 300px;
will-change: transform;
}
#block {
background-color: #cef;
height: 50px;
left: 50px;
position: absolute;
top: 200px;
width: 200px;
}
</style>
</head>
<body onload="runRepaintTest()">
This tests that an element which is moved by the synchronous layout in
Element::setScrollTop, and again by the scroll itself, has its original
location correctly invalidated.
<div id="scroller">
<div style="height: 900px"></div>
<div id="block"></div>
</div>
<script>
function repaintTest()
{
document.querySelector("#block").style.top = '310px';
document.querySelector("#scroller").scrollTop = 150;
}
</script>
</body>
</html>