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pseudo-class

pseudo-class

notes

example

:first-childarrow-up-right

⭐️ 注意： p:first-child 是指一個 <p> 同時又是 :first-child。 如果要選「第一個出現」的 <p>，要用 p:first-of-type。

:first-of-typearrow-up-right

:nth-of-type( )arrow-up-right

:last-child

:only-child

:nth-child(an+b)

:not( «selector» )

:not(:defined)

unkowned tag 👉custom element upgrade

undefined tag

:hover

:focus

:root

<html> element in HTML file

:definedarrow-up-right

any element that has been defined (builtin or custom)

:scopearrow-up-right

get direct children of an element

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