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diff --git a/testing/web-platform/tests/css/cssom-view/window-screen-width-immutable.html b/testing/web-platform/tests/css/cssom-view/window-screen-width-immutable.html
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+++ b/testing/web-platform/tests/css/cssom-view/window-screen-width-immutable.html
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+<!DOCTYPE html>
+<html>
+<head>
+    <title>CSSOM View - 4.2 - screen.width immutability</title>
+    <link rel="author" title="Neils Christoffersen" href="mailto:neils.christoffersen@gmail.com">
+    <link rel="help" href="http://www.w3.org/TR/cssom-view/#the-screen-interface">
+    <meta name="flags" content="dom">
+    <meta name="assert" content="screen.width is immutable">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id="myDiv"></div>
+    <div id="log"></div>
+    <script>
+        var originalVal = window.screen.width;
+
+        // try to set window.screen.width
+        window.screen.width = 0;
+
+        // verify window.screen.width didn't change
+        test(function() {
+            assert_equals(window.screen.width, originalVal, "window.screen.width should be immutable")
+        }, "immutability test");
+    </script>
+</body>
+</html>