Though it might seem inconceivable that there are still people out there using browsers that are not JS enabled, it is nevertheless true. Maybe he is using a pre-historic browser; maybe he turned off JavaScript afraid that someone will format his hard disk using a JavaScript program or maybe he's just plain tired of the things people like you and me do to his browser using JavaScript (I have to admit this seems a bit far fetched. I mean, who could ever get tired of flashing background, scrolling status bar and helpful messages popping up every now and then). While writing an HTML page containing JavaScript, it is always a good idea to consider non JS browsers also. Some of the common techniques for dealing with non JS browsers are described below. Maybe he is using a pre-historic browser; maybe he turned off JavaScript afraid that someone will format his hard disk using a JavaScript program or maybe he's just plain tired of the things people like you and me do to his browser using JavaScript (I have to admit this seems a bit far fetched. I mean, who could ever get tired of flashing background, scrolling status bar and helpful messages popping up every now and then).While writing an HTML page containing JavaScript, it is always a good idea to consider non JS browsers also. Some of the common techniques for dealing with non JS browsers are described below.

There are different browsers and versions out there. Thus you, the programmer, do not know what JavaScript capabilities the user has. Insuring that the scripts you write run in most users browsers can be done in a few different ways. One way is to use JavaScript to check which browser they are using, and then program accordingly. This is the most common way to avoid any scripting errors on the different browsers.The information at the top of the page was printed out using the following functions, which retrieve the browser version, name and user agent:

Learn how to use the navigator object of Javascript to detect the browser type and version of your visitors.