(im a total noob) is there alternatives to applets and such for adding things to web pages?

Question

so i recently made a little applet and wanted to try it out but apparently chrome doesnt support applets anymore (correct me if im wrong)

So that got me thinking about "how do you add things to web pages that constantly change?". is there a way to code something in HTML/CSS/JavaScript and then add it to the main website or do you rewrite the whole website? or im I failing to understand how web design works and i should go back to my less-than-mediocre java skills instead.

Answer 1

There are few different ways to do this, but generally you use js for such things: https://en.m.wikipedia.org/wiki/Ajax_(programming)