IE11 WebGL unable to display Cocos2D-HTML5 tests correctly

The WebGL support in IE11 is a great step but I had problems in running Cocos2D-HTML5 in it. The tests run correctly in Firefox and Chrome using WebGL but errors show up in IE11 and the menu text isn't rendered.

Are these likely to be fixed before the final release or is there something wrong with the configuration of the site or browser security that is preventing it running correctly?

http://www.cocos2d-x.org/html5-samples/samples/tests/index.html

IE11 Console:

HTML1300: Navigation occurred.
File: tests
Cocos2d-html5-v2.1.4
cocos2d: GL_VENDOR:     Microsoft
cocos2d: GL_RENDERER:   Internet Explorer
cocos2d: GL_VERSION:    WebGL 0.9
cocos2d: GL_EXTENSIONS:  
cocos2d: GL_MAX_TEXTURE_SIZE: 16384
cocos2d: GL_MAX_TEXTURE_UNITS: 16
cocos2d: GL supports PVRTC: NO
cocos2d: GL supports BGRA8888 textures: NO
cocos2d: GL supports NPOT textures: YES
cocos2d: GL supports discard_framebuffer: NO
cocos2d: GL supports shareable VAO: NO
WEBGL11095: INVALID_OPERATION: bindAttribLocation: Method not currently supported
...
WEBGL11002: INVALID_ENUM: pixelStorei
...
function requestAnimationFrame() { [native code] }
...
WEBGL11004: INVALID_OPERATION: vertexAttribPointer
WEBGL11094: INVALID_OPERATION: vertexAttribPointer: Enum UNSIGNED_BYTE is not currently supported
WEBGL11004: Too many errors encountered - no more errors will be logged