选择器
1.plate 标签选择器
2.bento 标签选择器
3.#fancy #id选择器
4.plate apple
5.#fancy pickle
6..small
7.bento .small, plate .small
8.bento orange
9.plate,bento,plate
10.*
11.plate *
12.plate +apple
13.pickle~pickle
14.plate>apple
15.plate :first-child
16.plate :only-child
17..small:last-child
18.plate:nth-child(3)
19.bento:nth-last-child(4)
20.apple:first-of-type
21.plate:nth-of-type(even)
22.plate:nth-of-type(2n+3)
23.plate apple:only-of-type
24..small:last-of-type
25.bento:empty
26.apple:not(.small)
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