Server rendered html page -> load javascript file -> javascript manipulates the dom

1. slow
2. html is highly coupled with the js, and js mutating the dom
3. hard to test

First popular single page frontend MVC framework, which enabled the rapid development in frontend.

1. code starts to be a bit organized
2. testing is better
3. still manipulates dom

Also popular framework, handles two way binding for you.

1. virtual dom frees developers from manipulating the DOM
2. testing is better
3. application is easier to reason about

React.createElement

ReactDom.reander