CSS Exclusions (previously known as "positioned floats") enable you to create webpages where text and other content can wrap around specific elements. This sample shows how to use exclusions to create complex layouts with elements absolutely positioned relative to a container.
The Exclusion placed in a normal flow example shows how an excusion can be absolutely positioned relative to a container. Inline content within that container (for example, text) will then wrap around the positioned float. The absolutely positioned image positions itself relative to the nearest non-statically positioned ancestor, a <div> element, which is set to position: relative.
Exclusion placed in multicolumn shows how an excusion image can be positioned within a multi-column container so that it aligns with the column structure of the text. As you resize the window, you’ll see how the image moves and resizes relative to the column it is in.
The Exclusion placed in grid example shows how an excusion image element can be positioned within the grid layout of a parent container.
The Exclusion placed in a table shows how an excusion can impinge on the table layout of a parent container. The image is positioned relative to the corner of the <div> and in the default view is partially outside the table. As you change the size of the window, you can see how the table and text flow around the image.
Reference
CSS Exclusions
Conceptual
Internet Explorer 10 Developer Guide: CSS Exclusions
Internet Explorer Test Drive
Hands On: Positioned Floats
IEBlog
Building Rich Text-Centric Pages in IE10
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