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diff --git a/layout/reftests/reftest-sanity/reftest-opaque-layer-wait-pass.html b/layout/reftests/reftest-sanity/reftest-opaque-layer-wait-pass.html
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+++ b/layout/reftests/reftest-sanity/reftest-opaque-layer-wait-pass.html
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+<!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>
+
+<style>
+
+.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;
+}
+
+</style>
+
+<div class="content reftest-opaque-layer"></div>
+
+<div class="fixed opaque-background content reftest-opaque-layer"></div>
+
+<script>
+
+function doTest() {
+ document.documentElement.removeAttribute("class");
+}
+document.addEventListener("MozReftestInvalidate", doTest, false);
+
+</script>
+