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<html class="reftest-wait">
<!--
For bug 1266833; syncing the scroll offset to APZ properly when the scroll
position is clamped to a smaller value during a frame reconstruction.
-->
<script>
function run() {
document.body.scrollTop = document.body.scrollTopMax;
// Let the scroll position propagate to APZ before we do the frame
// reconstruction. Ideally we would wait for flushApzRepaints here but
// we don't have access to DOMWindowUtils in a reftest, so we just wait
// 100ms to approximate it. With bug 1266833 fixed, this test should
// never fail regardless of what this timeout value is.
setTimeout(frameReconstruction, 100);
}
function frameReconstruction() {
document.body.classList.toggle('noscroll');
document.documentElement.classList.toggle('reconstruct-body');
document.getElementById('spacer').style.height = '100%';
document.documentElement.classList.remove('reftest-wait');
}
</script>
<style>
html, body {
margin: 0;
padding: 0;
background-color: green;
}
.noscroll {
overflow: hidden;
height: 100%;
}
/* Toggling this on and off triggers a frame reconstruction on the <body> */
html.reconstruct-body::before {
top: 0;
content: '';
display: block;
height: 2px;
position: absolute;
width: 100%;
z-index: 99;
}
</style>
<body onload="setTimeout(run, 0)">
<div id="spacer" style="height: 5000px">
This is the top of the page.
</div>
This is the bottom of the page.
</body>
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