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Test Info:
<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8">
<title>Removing an existing display item from the bottom of an existing PaintedLayer shouldn't cause the other items in that layer to change layers</title>
<style>
.content {
box-sizing: border-box;
width: 200px;
height: 200px;
border: 1px solid black;
}
.fixed {
position: fixed;
top: 20px;
left: 140px;
}
.onTopOfFixed {
position: absolute;
top: 120px;
left: 260px;
}
.reftest-no-paint {
border-color: lime;
}
#aboutToBecomeHidden {
left: 20px;
}
body {
margin: 0;
padding: 20px;
height: 3000px;
}
</style>
<div class="fixed content">
<!--
This layer is just there to force .onTopOfFixed into a PaintedLayer above
the page background.
-->
</div>
<div class="onTopOfFixed content" id="aboutToBecomeHidden" style="visibility: visible">
<!--
This item starts out visible, in the same layer as the other .onTopOfFixed item.
-->
</div>
<div class="onTopOfFixed reftest-no-paint content">
<!--
This item shouldn't repaint when the other .onTopOfFixed item becomes invisible.
-->
</div>
<script>
function doTest() {
document.querySelector("#aboutToBecomeHidden").style.visibility = "hidden";
document.documentElement.removeAttribute("class");
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>