REQUIREMENTS FOR AJAX

Before starting I would like to mention few words about the post, this content was collected form the book named "Beginning Ajax with PHP - From Novice to Professional". Basically according to the blog title, this is my notebook. I am not a professional developer, I am student and I am just sharing what I am learning with my fellow learners. If somehow this content is a cause of violation please ping, I will be glad to know if there is any problem.

AJAX REQUIREMENT

Since Ajax is based upon JavaScript technology, it goes without saying that JavaScript must be enabled in the user’s browser in order for it to work. That being said, most people do allow their browsers to use JavaScript, and it is not really that much of a security issue to have it in place. It must be noted, however, that the user does have the ability to effectively “disable” Ajax, so it is important to make sure, when programming an Ajax application, that other means are available to handle maneuvering through the web site; or alternatively, that the user of the web site is kept properly informed of what is necessary to operate the application.
  Ajax is a fairly widely supported concept across browsers, and can be invoked on Firefox (all available versions), Internet Explorer (4.0 and higher), Apple Safari (1.2 and higher), Konqueror, Netscape (7.1 and higher), and Opera (7.6 and higher). Therefore, most browsers across the widely used gamut have a means for handling Ajax and its respective technologies.
  At this point, the only real requirement for making use of Ajax in an efficient and productive manner is the creativity of going against what the standard has been telling us for years, and creating something truly revolutionary and functional.