Now, more than 3 years later, Opera released the first public build with a standards-based 3D canvas implementation using WebGL for Windows.
The Hardware acceleration in this build is a bit different from what other browsers are doing. Much like IE9 and Firefox 4, do full hardware acceleration of all draw operations - but then, unlike those browsers, who only offer this acceleration on Windows Vista and Windows 7, the implementation will run on any OS with sufficient hardware support. This means full hardware acceleration can be achieved on Windows XP, Linux, Mac OS X and OpenGL ES 2 capable devices such as recent smart-phones and web-enabled TVs.
This build only has an OpenGL backend. That means your system must have an OpenGL 2.x compatible graphics card and related drivers for hardware acceleration and WebGL to work.