Apart from HTML, JavaScript, DOM, and CSS, conceptually, what else do we need to create our own AJAX functionality?

Apart from HTML, JavaScript, DOM, and CSS, conceptually, what else do

1.	Apart from HTML, JavaScript, DOM, and CSS, conceptually, what else do we need to create our own AJAX functionality?
Answer» Apart from understanding the basic working scenario of HTML, JavaScript, DOM, and CSS, a developer also needs to understand the concept of HTTP request & response. Developers can encounter subtle bugs if they do not have a fair understanding of the GET and POST methods when they REMAIN configured with XMLHTTPREQUEST and HTTP response codes.