1 files changed, 45 insertions, 0 deletions
diff --git a/layout/reftests/bugs/1021564-4.html b/layout/reftests/bugs/1021564-4.html
new file mode 100644
index 0000000000..831c8bd914
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+++ b/layout/reftests/bugs/1021564-4.html
@@ -0,0 +1,45 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<html lang="en" class="reftest-wait">
+<meta charset="utf-8">
+<title>When the filtered element's BBox relative to the page changes, the filtered element needs to be invalidated</title>
+
+<style>
+
+#spacer {
+  height: 100px;
+}
+
+#filtered {
+  width: 100px;
+  height: 100px;
+  filter: url(#filter);
+}
+
+</style>
+
+<svg height="0">
+  <defs>
+    <filter id="filter" filterUnits="userSpaceOnUse"
+            x="0" y="0" width="100" height="100"
+            color-interpolation-filters="sRGB">
+      <feFlood flood-color="lime"/>
+    </filter>
+  </defs>
+</svg>
+
+<div id="spacer"></div>
+
+<div id="filtered"></div>
+
+<script>
+
+window.addEventListener("MozReftestInvalidate", function () {
+  document.getElementById("spacer").style.height = "50px";
+  document.documentElement.removeAttribute("class");
+});
+
+</script>