1 Test Navigator properties.
3 typeof navigator: object
4 navigator: [object WorkerNavigator]
5 navigator.appName: Netscape
6 navigator.appVersion.indexOf('WebKit') != 0: true
7 typeof navigator.platform: string
8 navigator.userAgent.indexOf('WebKit') != 0: true
9 typeof navigator.onLine: boolean
10 navigator.appCodeName === 'Mozilla': true
11 navigator.product === 'Gecko': true