Why use javascript & its libraries?

Question

why use javascript or jquery etc to access DOM and make changes to the HTML rather than changing the Html itself?

Answer 1

Because some things are just impossible or at least hard using only HTML, like creating a menu, timer and a lot of other things

Answer 2

They make coding easier

Answer 3

They make web development including JavaScript more easier like how to quickly create animations using jQuery and targeting html tags

Answer 4

HTML is not a programming language, it's a mark up language, it can't do any progrmming job as Javascript does.

Answer 5

"They make coding easier"... please elaborate