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Test Info:
<!DOCTYPE html>
<html lang="en" class="reftest-wait"
reftest-displayport-x="0"
reftest-displayport-y="0"
reftest-displayport-w="800"
reftest-displayport-h="1000">
<meta charset="utf-8">
<title>Scrolling shouldn't invalidate the relatively-positioned layer</title>
<style>
.content {
box-sizing: border-box;
width: 200px;
height: 200px;
border: 1px solid black;
}
.fixed {
position: fixed;
top: 20px;
left: 20px;
}
.reftest-no-paint {
border-color: lime;
}
.distanceFromTop {
margin-top: 240px;
}
.relative {
position: relative;
}
body {
margin: 0;
padding: 20px;
height: 3000px;
}
</style>
<div class="fixed reftest-no-paint content">
<!--
This fixed layer gets its own PaintedLayer above the page.
It shouldn't attempt to pull up an opaque background color from the page,
because the page can move under it.
-->
</div>
<div class="distanceFromTop relative reftest-no-paint content">
<!--
This item is above .fixed in z-order, but it starts out not intersecting
.fixed. It should still get its own layer from the start, because it can
get scrolled on top of .fixed.
-->
</div>
<script>
function doTest() {
document.documentElement.scrollTop = 100;
document.documentElement.removeAttribute("class");
}
document.documentElement.scrollTop = 0;
document.addEventListener("MozReftestInvalidate", doTest);
</script>