Answer 1

https://www.thatcompany.com/differences-css2-css3

Answer 2

CSS3 has new elements!

Answer 3

Here's my favorite overview:

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/CSS3_taxonomy_and_status-v2.png/360px-CSS3_taxonomy_and_status-v2.png

Similar inquiry:

https://www.sololearn.com/Discuss/840640/?ref=app

Please search prior to posting.

(keyword: "css2")

Happy coding!

Answer 4

transform property was introduced in css3 for example

Answer 5

->CSS3 is divided into many different documents called Modules. Every module adds new capability or extends features defined in CSS2 over preserving backward compatibility. Work on CSS3 started around the time of publication of the original CSS2 recommendation.
->The CSS3 version supports many more browsers than CSS2.
CSS3 introduces many new selectors. Those new selectors are mostly in a form of pseudo-elements and pseudo classes.
New addition of General Sibling Combinator that may be used to match sibling elements of a given element through tilde (~) combinator.
->CSS3 introduces many properties accompanied with new values and units. It facilitates styling of backgrounds, borders, boxes, etc..., which allows us to keep most of the styling within the WWW and HTML standards and our document, without a need for all those proprietary third party software packages.
New values and new units are introduced to support all those new properties. For instance Angle units deg, grad, rad and turn or Time units s and ms.