1. Basic introduction
(1) [att*=val] attribute selector
If the attribute value of the attribute represented by att of the element contains The character specified by val, then the element uses this style
(2) [att^=val] attribute selector
If the starting character of the attribute value of the element represented by att is The character specified by val, then the element uses this style
(3) [att$=val] attribute selector
If the element uses the attribute represented by att If the ending character of the value is the character specified by val, the element uses this style
2. Example
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