1 files changed, 23 insertions, 0 deletions
diff --git a/layout/reftests/svg/mask-type-03.svg b/layout/reftests/svg/mask-type-03.svg
new file mode 100644
index 0000000000..b333b6bf08
--- /dev/null
+++ b/layout/reftests/svg/mask-type-03.svg
@@ -0,0 +1,23 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"
+     class="reftest-wait" onload="run()">
+
+  <title>Testcase for alpha mask, dynamically setting mask-type</title>
+
+  <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=793617 -->
+
+  <mask id="m" maskContentUnits="objectBoundingBox">
+    <rect x=".1" y=".1" width=".8" height=".8" fill="black" fill-opacity="0.5"/>
+  </mask>
+  <rect width="100" height="100" fill="blue" mask="url(#m)"/>
+
+  <script>
+    function run() {
+      document.getElementById("m").style.maskType = "alpha";
+      document.documentElement.removeAttribute("class");
+    }
+  </script>
+</svg>