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 CSSFontFaceDescriptors]');
                }
            }, 'The style attribute must return a CSSFontFaceDescr