归纳最全的CSS2和CSS3区别

新选择器

　　下面是 CSS3 中新增的选择器。

• Substring matching attribute selectors ([att^=val], [att$=val], [att*=val])
• :target pseudo-class
• New pseudo-classes: :enabled, :disabled, :checked, and :indeterminate
• :root pseudo-class
• New expression-based structural pseudo-classes: :nth-child(), :nth-last-child(), :nth-of-type(), :nth-last-of-type()
• Other new structural pseudo-classes: :last-child, :first-of-type, :last-of-type, :only-child, :only-of-type, :empty
• The negation pseudo-class :not()
• Four pseudo-elements with double-colon syntax (::first-line, ::first-letter,::before, ::after)
• The following-sibling combinator (p ~ img)
• ::selection pseudo-class (removed from the spec, but everyone uses it)