[whatwg] proposal: Add support for masking to canvas

[Boris Zbarsky]

On 1/29/13 11:37 PM, Rik Cabanier wrote:
> So the API could be as follows:
...
> unrestricted double? sx;
> unrestricted double? sy;

Do these actually need to be nullable?  What's the use case for setting 
them to null?

Same thing for the rest of this dictionary's members.

-Boris