Microsoft’s announcement, “WebGL Considered Harmful,” was published on the official blog of the Microsoft Security Response Center (MSRC) and signed by MSRC Engineering. It was posted by swiat, which is short for Secure Windows Initiative Attack Team, the group that is responsible for the security architecture of Windows and other Microsoft products.

We believe that WebGL will likely become an ongoing source of hard-to-fix vulnerabilities. In its current form, WebGL is not a technology Microsoft can endorse from a security perspective.
http://www.zdnet.com/blog/bott/micro...x-harmful/3470