All the available browsers can't support AJAX. Here is a list of major browsers that support AJAX.
When you write your next app, do consider the browsers that do not support AJAX.
It is for Opera 8.0+, Firefox, and Safari browsers. If it fails, we try two more times to make the right object for an Internet Explorer browser with −
If it doesn't work, then we can utilize a very outdated browser that doesn't support XMLHttpRequest, which also means it doesn't support AJAX.
Most likely though, our variable ajaxRequest will now be set to whatever XMLHttpRequest standard the browser uses and we can start sending data to the server. The step-wise AJAX workflow is explained in the next section.