Author: Nishi Surti

What ? (are these)Basically async and defer are attributes that can be used by <script> to improve page speed by decreasing loading lag.Why? (do we use)We add this attribute to script tag in HTML to control script loading and executing.How? (it works)async : This attribute tells browser to download script file asynchronously while continuing to parse the HTML page. Once script has downloaded it executes immediately regardless page parsing.defer : This attribute also tells browser to download script file asynchronously while continuing to parse the HTML page. Name is self-evidently, it defers execution of script until HTML page has finished…