It is true that you should check to see if a browswer supports the feature you wish to use. As for the fact that the alert returns Nestscape goes back to the history of Javascript. Here is a quick Google research post (hope you can see why it returns Netscape' 'JavaScript, not to be confused with Java, was created in 10 days in May 1995 by Brendan Eich, then working at Netscape and now of Mozilla. JavaScript was not always known as JavaScript: the original name was Mocha, a name chosen by Marc Andreessen, founder of Netscape.Jun 27, 2012'