As an extension of the float property, exclusions (a.k.a. "positioned floats") allow you to define arbitrary areas that inline content can flow around.
For a live demonstration of CSS3 exclusions, visit this link in a supporting browser.
Standard Syntax:
None
Vendor Prefix (partial support):
Chrome 23+, Firefox 16+, IE10+
CSS3 Exclusions (MSDN)
CSS Exclusions (Adobe)