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<!DOCTYPE HTML>
<html>
<head>
<title>Test for Bug 1515822 - restore scroll position for display: contents children</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<style>
#shell {
display: contents;
}
#outer {
width: 200px;
height: 200px;
overflow: scroll;
}
#inner {
width: 400px;
height: 400px;
background: linear-gradient(to right bottom, white, black);
}
</style>
</head>
<body>
<div id="shell">
<div id="outer">
<div id="inner">
</div>
</div>
</div>
<script>
SimpleTest.waitForExplicitFinish();
SpecialPowers.pushPrefEnv({
set: [ ["layout.disable-pixel-alignment", true] ]
}).then(() => {
const outer = document.querySelector('#outer');
outer.scrollTop = 100;
outer.scrollLeft = 100;
document.body.offsetTop; // flush layout
is(outer.scrollTop, 100, 'scroll position should be moved');
is(outer.scrollLeft, 100, 'scroll position should be moved');
outer.parentElement.style.display = 'none';
document.body.offsetTop; // flush layout
is(outer.scrollTop, 0, 'scroll position should be zero');
is(outer.scrollLeft, 0, 'scroll position should be zero');
outer.parentElement.style.display = "";
document.body.offsetTop; // flush layout
is(outer.scrollTop, 100, 'scroll position should be restored');
is(outer.scrollLeft, 100, 'scroll position should be restored');
SimpleTest.finish();
});
</script>
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