California Code, Streets and Highways Code - SHC § 10013

Whenever any notice, resolution, order, or other matter is required to be published or posted, and the duty of posting or publishing, or procuring the same, is not specifically enjoined upon any officer or person, the clerk shall post or procure the publication or posting thereof, as the case may be.

No step in any proceeding shall be invalidated or affected by any error or mistake or departure from the provisions of this section as to the officer or person posting or publishing, or procuring the publication or posting, of any notice, resolution, order, or other matter when the same is actually published or posted for the time required.