It's only relatively recent that you could write vanilla HTML/CSS/JS & have it work. There were inconsistencies across browsers and browser versions. Framewor

It's only relatively recent that you could write vanilla HTML/CSS/JS & have it work. There were inconsistencies across browsers and browser versions. Frameworks like Jquery came about to paper over those inconsistencies. It's similar for CSS with the added twist that it's a fair amount of work to get something non-hideous. Much better to start with something reasonably good looking and tweak from there.