嘿嘿

图片发自App

1～26:

plate

bento

#fancy

plate  apple

#fancy  pickle

.small

bento  .small,plate  .small

bento orange

bento,plate

*

plate  *

plate+apple

bento~pickle

plate>apple

orange:first–child

apple:only–child,pickle:only–child

.small:last–child,pickle

plate:nth–child(3)

bento:nth–last–child(4)

apple:first–of–type

plate:nth–of–type(even)

plate:nth–of–type(2n+3)

apple:only–of–type

.small:last–of–type

bento:empty

apple:not(.  small)