Full form of CSS 3 is Cascading Style Sheets. CSS 3 is a styling language that characterizes design of HTML archives. For instance, CSS 3 covers fonts, colors, margins, lines, height, width, background images, advanced positions and many other things
HTML could be (mis-)used to add format to sites. In any case CSS 3 offers more choices and is more faultless and advanced. CSS 3 is backed by all programs today.
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You are right anismith.