Whats New in CSS3

CSS3 Features:

There are several new functionalities have been provided through CSS3. Functions such like opacity, Text-overflow, media queries and box shadows are some of the much attractive introductions.

1- With CSS3 you’ll be able to add not one, not four, but eight background images to a single element.

2- CSS3 is also addingborder-radius that may eliminate the need for images to create rounded corners in most cases.
Example: <div style=" background-color: #ccc; -moz-border-radius: 5px; -webkit-border-radius: 5px; border: 1px solid #000; padding: 10px;" > 

3-  in CSS3 you Can Set Border-image Property. Border-image, allows an image to be used as the border of an element.

4- you can set text-shadow in CSS3 by using text-shadow: 2px 2px 2px #000; property.

5- in CSS3 you can set Transparency & Opacity of a element.
  example: <img src="opacity.png" style="margin: 10px; opacity:0.25; width:179px; height:76px;"/>

6- The word-wrap property added to CSS3 and it is really essential. 
   example : <p style="word-wrap: break-word;...

7- in CSS3 you can Rotate any element by using transform property.
example: div{ transform :rotate(30deg); }

8- The float property specifies whether an element should float to the left, right, or not at all.

9- The clear property specifies what should happen with the element that is next to a floating element.

https://www.w3schools.com/