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diff --git a/layout/reftests/bugs/1018522-1.html b/layout/reftests/bugs/1018522-1.html
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+++ b/layout/reftests/bugs/1018522-1.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Test that opacity changes on layers make the Compositor repaint the right area</title>
+
+<style>
+
+#box {
+  width: 100px;
+  height: 100px;
+  border: 10px solid black;
+  opacity: 1;
+  will-change: opacity;
+}
+
+#box.halfTransparent {
+  opacity: 0.5;
+}
+
+</style>
+
+<div id="box"></div>
+
+<script>
+
+window.addEventListener("MozReftestInvalidate", function (e) {
+  document.getElementById("box").className = "halfTransparent";
+  document.documentElement.removeAttribute("class");
+});
+
+</script>