css pseudo-class (伪类)checked unchecked
checked
input[type="checkbox"]:checked
{/* styles */}
input[type="checkbox"]:not(:checked)
{/* styles */}
:unchecked does not exist in the level 3 Selectors or UI specs, nor has it appeared in level 4 of Selectors yet. The Selectors specs wouldn't bother to suggest using :not(:checked) were there such a pseudo-class.
http://stackoverflow.com/questions/8846075/css3-unchecked-pseudo-class
:unchecked
:not(:checked)
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