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diff --git a/layout/reftests/image-rect/dom-api-computed-style.html b/layout/reftests/image-rect/dom-api-computed-style.html
new file mode 100644
index 0000000000..f5efc91b07
--- /dev/null
+++ b/layout/reftests/image-rect/dom-api-computed-style.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<!--
+    Any copyright is dedicated to the Public Domain.
+    http://creativecommons.org/licenses/publicdomain/
+
+    Tests if getComputedStyle() works on -moz-image-rect() and formats the
+    output correctly.
+-->
+<html>
+  <head>
+    <title>Testcases: -moz-image-rect() [bug 113577]</title>
+    <style>
+      div.wrapper {
+        width: 32px;
+        height: 32px;
+        margin: 10px;
+        background-color: red;
+      }
+      div.wrapper div {
+        width: 32px;
+        height: 32px;
+        background: no-repeat;
+      }
+    </style>
+    <script>
+      var curdir   = location.href.replace(/[^/]+$/, "");
+      // Tests a common usage
+      var test1    = "-moz-image-rect(url(green-16x16-in-blue-32x32.png), 0, 16, 16, 0)";
+      var testRef1 = "-moz-image-rect(url(\"" + curdir + "green-16x16-in-blue-32x32.png\"), 0, 16, 16, 0)";
+      // Tests an irregular but valid usage
+      var test2    = "-moz-image-rect( 'green-16x16-in-blue-32x32.png' , 0.0% , 50.5% , 49.5% , 0.0% )";
+      var testRef2 = "-moz-image-rect(url(\"" + curdir + "green-16x16-in-blue-32x32.png\"), 0%, 50.5%, 49.5%, 0%)";
+      // Tests a wrong syntax (negative value)
+      var test3    = "-moz-image-rect(url(green-16x16-in-blue-32x32.png), 0%, -50%, 50%, 0%)";
+      var testRef3 = "none";
+      // Checks if I didn't break the default url() notation.
+      var test4    = "url(  green-16x16-in-blue-32x32.png  )";
+      var testRef4 = "url(\"" + curdir + "green-16x16-in-blue-32x32.png\")";
+
+      function equalComputedDOMIO(domInput, domOutputRef, targetId) {
+        var targetObj = document.getElementById(targetId);
+        targetObj.style.backgroundImage = domInput;
+        var domOutput = getComputedStyle(targetObj, null).getPropertyValue("background-image");
+        document.write(domOutput == domOutputRef ? "SUCCESS" : ("FAIL: " + domOutput));
+      }
+    </script>
+  </head>
+  <body>
+    <div class="wrapper"><div id="test1"></div></div>
+    <script>
+      equalComputedDOMIO(test1, testRef1, "test1");
+    </script>
+    <div class="wrapper"><div id="test2"></div></div>
+    <script>
+      equalComputedDOMIO(test2, testRef2, "test2");
+    </script>
+    <div class="wrapper"><div id="test3"></div></div>
+    <script>
+      equalComputedDOMIO(test3, testRef3, "test3");
+    </script>
+    <div class="wrapper"><div id="test4"></div></div>
+    <script>
+      equalComputedDOMIO(test4, testRef4, "test4");
+    </script>
+  </body>
+</html>