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diff --git a/layout/reftests/table-background/table-row-opacity-dynamic-2.html b/layout/reftests/table-background/table-row-opacity-dynamic-2.html
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+++ b/layout/reftests/table-background/table-row-opacity-dynamic-2.html
@@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<html class="reftest-wait">
+<title>Test for bug 1224251</title>
+<style>
+
+body { background: white; color: black }
+
+table {
+ padding: 0;
+ border-spacing: 0;
+ border: none;
+ width: 15em;
+}
+
+tr {
+ background: rgba(0, 0, 255, 0.8);
+}
+
+td {
+ border: none;
+}
+
+</style>
+
+
+<table>
+ <tr style="opacity: 0.8"><td>cell</td></tr>
+</table>
+
+<script>
+
+var tr = document.getElementsByTagName("tr")[0];
+
+// Not sure why, but to make this test fail without the patch, this has to
+// be a setTimeout(0) rather than waiting for MozReftestInvalidate.
+setTimeout(step1, 0);
+
+function step1() {
+ tr.style.opacity = "0.8";
+ setTimeout(step2, 0);
+}
+
+function step2() {
+ tr.style.opacity = "0.8";
+ setTimeout(step3, 0);
+}
+
+function step3() {
+ tr.style.opacity = "";
+
+ document.documentElement.classList.remove("reftest-wait");
+}
+
+</script>