// Copyright (c) 2012 Ecma International. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- es5id: 15.2.3.8-4-3 description: Object.seal - the extension of 'O' is prevented already ---*/ var obj = {}; obj.foo = 10; // default value of attributes: writable: true, configurable: true, enumerable: true var preCheck = Object.isExtensible(obj); Object.preventExtensions(obj); Object.seal(obj); assert(preCheck, 'preCheck !== true'); assert(Object.isSealed(obj), 'Object.isSealed(obj) !== true');