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Test Info:

<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8">
<title>Both divs should be part of opaque layers in the final paint.</title>
.content {
box-sizing: border-box;
width: 200px;
height: 200px;
border: 1px solid black;
.fixed {
position: fixed;
top: 20px;
left: 140px;
.opaque-background {
background-color: white;
.reftest-wait .opaque-background {
/* make the layer start out transparent */
background-color: transparent;
body {
height: 4000px;
<div class="content reftest-opaque-layer"></div>
<div class="fixed opaque-background content reftest-opaque-layer"></div>
function doTest() {
document.addEventListener("MozReftestInvalidate", doTest);