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Test Info:
<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8">
<title>Moving the transform under the absolutely-positioned layer should cause that to invalidate</title>
<style>
.content {
box-sizing: border-box;
width: 200px;
height: 200px;
border: 1px solid black;
}
.absolute {
position: absolute;
z-index: 2;
top: 20px;
left: 240px;
}
.reftest-no-paint {
border-color: lime;
}
.transform {
will-change: transform;
}
body {
margin: 0;
padding: 20px;
height: 3000px;
}
</style>
<div class="transform content" id="aboutToMoveUnderAbsolute">
<!--
This transform is active + prerendered, and will move under the
absolutely-positioned item.
-->
</div>
<div class="absolute reftest-no-paint content">
<!--
This absolutely-positioned element should get its own PaintedLayer above the
transform.
It shouldn't attempt to pull up an opaque background color from the page,
because the transform can move under it.
-->
</div>
<script>
function doTest() {
document.querySelector("#aboutToMoveUnderAbsolute").style.transform = "translateX(100px)";
document.documentElement.removeAttribute("class");
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>