spec:css-shapes

The Shapes portions of CSS Exclusions and Shapes are now their own module.

Currently, level 1 of CSS Shapes only includes shape-outside on floats with values from Basic Shapes and image URLs.

The intent is for the shape-inside property and defining shapes with SVG elements to be defined in a future level of CSS Shapes, as well as defining how Shapes contribute to exclusion areas in either a future level of CSS Shapes or CSS Exclusions. Given the postponement of shape-inside, it will need to default to 'auto' for backwards compatibility.

Next-Level Functionality

shape-inside property. This takes the same values as shape-outside, with an additional shape-outside value to have the shape-inside match the shape-outside. The initial value will be 'auto'). The property defines a shape to wrap the element's content inside.

shape-padding property. This is the padding equivalent of shape-margin, and modifies the shape given by shape-inside.

Referencing SVG shapes. The <uri> value for shape-inside can reference an SVG shape.

Adding path() to Basic Shapes. A path() function could be added to the Basic Shapes section.
Creating a shape from rendered content https://www.w3.org/Bugs/Public/show_bug.cgi?id=16716
Creating a shape using an element's border box http://lists.w3.org/Archives/Public/www-style/2013Jun/0282.html
Add an 'image' keyword to shape-outside http://lists.w3.org/Archives/Public/www-style/2013Jun/0282.html