[class*=”content”]:before css styles in TwentyThirteen [closed]

It is a CSS3 Substring matching attribute selector. See section 6.3.2. Substring matching attribute selectors in the W3C document: Selectors Level 3.

Quote:

[att*=val]
Represents an element with the att attribute whose value contains at least one instance of the substring “val”. If “val” is the empty string then the selector does not represent anything.

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