SharePoint s4-notnotdlg: The opposite of s4-notdlg

[Until I do, this is a warning about this only being tested in 2010]

So there is a CSS class in SharePoint that allows you to have content that will NOT show up in any dialog: The s4-notdlg class. Pretty easy: just add the class to your fancy branding, elements, etc. and it will be excluded when element is displayed in a SharePoint dialog.

 

But what about the opposite: Is there a class that lets you have content that will ONLY display in a dialog? No, there is not. But through the magic of CSS selectors, you can accomplish this behavior pretty easily: