This tests the length property of constructors. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS ArrayBuffer.length is 1 PASS AudioContext.length is 0 PASS AutocompleteErrorEvent.length is 1 PASS Blob.length is 0 PASS CloseEvent.length is 1 FAIL CustomEvent.length should be 1. Was 0. FAIL DOMFormData.length should be 0. Threw exception ReferenceError: DOMFormData is not defined PASS DOMParser.length is 0 PASS DataView.length is 3 PASS ErrorEvent.length is 1 PASS Event.length is 1 PASS EventSource.length is 1 PASS Float32Array.length is 3 PASS Float64Array.length is 3 PASS FileReader.length is 0 FAIL FileReaderSync.length should be 0. Threw exception ReferenceError: FileReaderSync is not defined PASS HashChangeEvent.length is 1 PASS Int16Array.length is 3 PASS Int32Array.length is 3 PASS Int8Array.length is 3 FAIL Intent.length should be 3. Threw exception ReferenceError: Intent is not defined FAIL MediaStream.length should be 0. Threw exception ReferenceError: MediaStream is not defined PASS MessageChannel.length is 0 PASS MessageEvent.length is 1 PASS PageTransitionEvent.length is 1 FAIL PeerConnection.length should be 2. Threw exception ReferenceError: PeerConnection is not defined PASS PopStateEvent.length is 1 PASS ProgressEvent.length is 1 PASS ShadowRoot.length is 0 PASS SharedWorker.length is 1 PASS StorageEvent.length is 1 PASS TrackEvent.length is 1 PASS Uint16Array.length is 3 PASS Uint32Array.length is 3 PASS Uint8Array.length is 3 PASS Uint8ClampedArray.length is 3 PASS VTTCue.length is 3 PASS WebGLContextEvent.length is 1 PASS WebKitAnimationEvent.length is 1 PASS WebKitCSSMatrix.length is 0 PASS WebKitMutationObserver.length is 1 PASS WebKitTransitionEvent.length is 1 PASS WebSocket.length is 1 PASS Worker.length is 1 PASS URL.length is 1 PASS XMLHttpRequest.length is 0 PASS XMLSerializer.length is 0 PASS XPathEvaluator.length is 0 PASS XSLTProcessor.length is 0 PASS successfullyParsed is true TEST COMPLETE