There are many good reasons why you should disable java script in your browsers. Estimates aren’t too accurate but somewhere around 5 to 7 percent of internet users have disabled java script. That means 1 out of every 20 visitors might not be able to see your website. So it is important to ensure that your website work properly with or without java script.
There are many other internet techniques which can accomplish most of what you would probably use java script to do:
1. Image rollovers: this can be accomplished by CSS by using the ‘hover’ state to shift the position of an element or show a new element.
3. Animation: for animation there are two alternatives, 1) create an animated gif image 2) use flash. Both the alternatives have their drawbacks. In case of animated gif image, you have restriction of size of file and in the case of flash you will encounter with the same problems you encounter with scripts.
4. Redirection and form validation: when you use script, it proceeds on client side which is why users re able to modify the behavior of web page when they turn it off. You can opt to do all the processing on server side by using any programming language. By choosing the server side processing, users will always be subject to some restrictions.
These are the few alternatives of it and in case if script elements are crucial to your website then you should mention that users should turn on java to take advantage of those features.
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