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+<!DOCTYPE html>
+<html>
+    <head>
+        <title>CSSOM Parsing Test: @font-face rules toString() as valid interfaces</title>
+        <link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
+        <link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> <!-- 2012-06-17 -->
+        <link rel="help" href="https://drafts.csswg.org/css-fonts-4/#om-fontface">
+
+        <meta name="flags" content="dom">
+
+        <script src="/resources/testharness.js"></script>
+        <script src="/resources/testharnessreport.js"></script>
+    </head>
+
+    <body>
+        <div id="log"></div>
+
+
+        <style id="teststyles">
+        @font-face {
+            src: url(http://foo/bar/font.ttf);
+        }
+        @font-face {
+            font-family: STIXGeneral;
+            src: local(STIXGeneral), url(/stixfonts/STIXGeneral.otf);
+            unicode-range: U+000-49F, U+2000-27FF, U+2900-2BFF, U+1D400-1D7FF;
+        }
+        @font-face {
+            font-family: MainText;
+            src: url(http://example.com/font.ttf);
+            font-variant: oldstyle-nums proportional-nums styleset(1,3);
+        }
+
+       @font-face {
+            font-family: BodyText;
+            src: local("HiraMaruPro-W4");
+            font-variant: proportional-width;
+            font-feature-settings: "ital"; /* Latin italics within CJK text feature */
+        }
+        </style>
+
+
+        <script>
+            var validRules = document.getElementById('teststyles').sheet.cssRules;
+
+            test(function(){
+                for (var i = 0; i < validRules.length; ++i) {
+                    assert_equals(validRules.item(i).toString(), '[object CSSFontFaceRule]');
+                }
+            }, '@font-face declarations are instances of CSSFontFaceRule')
+
+
+            test(function(){
+                for (var i = 0; i < validRules.length; ++i) {
+                    assert_equals(validRules.item(i).style.toString(), '[object CSSStyleDeclaration]');
+                }
+            }, 'The style attribute must return a CSSStyleDeclaration block')
+
+        </script>
+
+
+    </body>
+</html>