CSS Selector

A CSS selector is a pattern rule that matches style rules to a specific element (or elements). The selector begins a rule set and precedes definitions of how the element(s) should look.

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General knowledge

• Basic selectors
  • Type selectors elementname
  • Class selectors .classname
  • ID selectors #idname
  • Universal selectors * ns|* *|*
  • Attribute selectors [attr=value]
• Combinators
  • Adjacent sibling selectors A + B
  • General sibling selectors A ~ B
  • Child selectors A > B
  • Descendant selectors A B
• Pseudo-elements
• Pseudo-classes

Technical reference

Selectors Level 3