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Test Info:
<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8">
<title>Starting to scroll the nested scrollbox shouldn't invalidate the fixed layer</title>
<style>
.content {
box-sizing: border-box;
width: 200px;
height: 200px;
border: 1px solid black;
}
.fixed {
position: fixed;
top: 20px;
left: 240px;
}
.reftest-no-paint {
border-color: lime;
}
.scrollable {
overflow: auto;
padding: 10px;
}
.scrolled {
border: 1px solid gray;
height: 400px;
}
body {
margin: 0;
padding: 20px;
height: 3000px;
}
</style>
<div class="scrollable content" id="aboutToScroll">
<!--
This scrollbox starts out without active scrolling and is going to become
actively scrolled.
-->
<div class="scrolled"></div>
</div>
<div class="fixed reftest-no-paint content">
<!--
This fixed layer gets its own PaintedLayer above the rest.
When the contents of .scrollable require their own PaintedLayer, that
should not cause .fixed to change layers.
-->
</div>
<script>
function doTest() {
document.querySelector("#aboutToScroll").scrollTop = 50 - document.querySelector("#aboutToScroll").scrollTop;
document.documentElement.removeAttribute("class");
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>