11.2

• #id
• element 
• .class
• *
• selector1,selector2,selectorN

• 层级

• ancestor descendant

• parent > child

• prev + next

• prev ~ siblings

• 基本筛选器

• :first

• :not(selector)

• :even

• :odd

• :eq(index)

• :gt(index)

• :lang^1.9+

• :last

• :lt(index)

• :header

• :animated

• :focus

• :root^1.9+

• :target^1.9+