Checks that __lookupGetter__ / __lookupSetter__() works for native bindings. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS Element.prototype.__lookupGetter__('tagName') is an instance of Function PASS Element.prototype.__lookupSetter__('tagName') is undefined. PASS Element.prototype.__lookupGetter__('tagName') is Object.getOwnPropertyDescriptor(Element.prototype, 'tagName').get PASS Element.prototype.__lookupSetter__('tagName') is Object.getOwnPropertyDescriptor(Element.prototype, 'tagName').set PASS testDiv.tagName is "DIV" PASS Element.prototype.__lookupGetter__('tagName').call(testDiv) is "DIV" PASS Element.prototype.__lookupGetter__('nodeName') is an instance of Function PASS Element.prototype.__lookupSetter__('nodeName') is undefined. PASS Element.prototype.__lookupGetter__('nodeName') is Object.getOwnPropertyDescriptor(Node.prototype, 'nodeName').get PASS Element.prototype.__lookupSetter__('nodeName') is Object.getOwnPropertyDescriptor(Node.prototype, 'nodeName').set PASS testDiv.nodeName is "DIV" PASS Element.prototype.__lookupGetter__('nodeName').call(testDiv) is "DIV" PASS HTMLElement.prototype.__lookupGetter__('innerText') is an instance of Function PASS HTMLElement.prototype.__lookupSetter__('innerText') is an instance of Function PASS HTMLDivElement.prototype.__lookupGetter__('innerText') is an instance of Function PASS HTMLDivElement.prototype.__lookupSetter__('innerText') is an instance of Function PASS testDiv.__proto__.__lookupGetter__('innerText') is an instance of Function PASS testDiv.__proto__.__lookupSetter__('innerText') is an instance of Function PASS testDiv.__proto__.__proto__.__lookupGetter__('innerText') is an instance of Function PASS testDiv.__proto__.__proto__.__lookupSetter__('innerText') is an instance of Function PASS HTMLElement.prototype.__lookupGetter__('innerText') is Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerText').get PASS HTMLElement.prototype.__lookupSetter__('innerText') is Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerText').set PASS testDiv.innerText is "" PASS HTMLElement.prototype.__lookupGetter__('innerText').call(testDiv) is "" testDiv.innerText = 'TEST1' PASS testDiv.innerText is "TEST1" PASS HTMLElement.prototype.__lookupGetter__('innerText').call(testDiv) is "TEST1" HTMLElement.prototype.__lookupSetter__('innerText').call(testDiv, '') PASS testDiv.innerText is "" PASS HTMLElement.prototype.__lookupGetter__('innerText').call(testDiv) is "" PASS successfullyParsed is true TEST COMPLETE