Custom Classes
The Custom Classes plugin allows you to create custom classes for posts (when post_class() is called) and for the <body> class (when body_class() is called). It creates a meta box on the edit post and edit term screens in the admin with input boxes for adding your custom classes.
Custom post classes are added whenever your theme calls the post_class() function, which is generally whenever a post is shown. Custom body classes are added on the single view of the post whenever your theme calls the body_class() function.
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Professional Support
If you need professional plugin support from me, the plugin author, you can access the support forums at Theme Hybrid, which is a professional WordPress help/support site where I handle support for all my plugins and themes for a community of 75,000+ users (and growing).
Plugin Development
If you’re a theme author, plugin author, or just a code hobbyist, you can follow the development of this plugin on it’s GitHub repository.
Will this work with custom post types?
Certainly. This plugin works with any public post type on your site. It’s not just limited to the “post” post type.
It’s not working!
Most likely, this means your theme isn’t using the appropriate functions (post_class() and body_class()). You’ll need to talk to your theme author to get them to fix this. Or, better yet, use a correctly-coded theme from Theme Hybrid!