Theme Check: Could not find post_class

What it does

post_class adds classes to the posts on a post by post basis, usually adding them to some kind of post “wrapper”. This allows for the targeting of posts with CSS rules according to various criteria– category, tag, sticky, format, etc. That is, theme authors, plugin authors, and individual users can write CSS rules based on the classes added by post_class and get very fine grained control over layout.

Why you want it

While I am not a canonical source, I am sure it is required according to the WordPress Theme guidelines to ensure a minimal functionality across themes. If you aren’t submitting your theme to the WordPress repo you can do what you want. There are no WordPress Theme Police to track you down and spank you, but post_class and the related body_class are very useful and easy to implement. I see no reason not to use them.

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