CSS3 is a cascading piece of paper that specifies concerning the data with a joined hypertext markup language document display. it's considerably additional options than previous CSS versions. additionally to further graphics functions, CSS3 permits, to pick out additional hypertext markup language tags and outline however they're displayed on an online browser. The standard structure of CSS3 permits a gradual unharness of recent options, and lets browsers update piecemeal to support the most recent definitions.
CSS3 is completely backwards compatible, so you will not have to change existing designs. Browsers will always support CSS2. CSS3 is split up into "modules". The old specification has been split into smaller pieces, and new ones have been also added.