Add exclusions support in WebKit as part of CSSRegions spec implementation. The exclusions are arbitrary shapes that will be avoided by the user agent when laying out content.
CSS Floats and Positioning Level 3 was published recently by Microsoft. Some of the properties in that spec are implemented in IE10 beta 2. http://www.interoperabilitybridges.com/css3-floats/
<rdar://problem/10042786>