The WebGL2RenderingContext.getInternalformatParameter() method of the WebGL 2 API returns information about implementation-dependent support for internal formats.
The WebGL2RenderingContext.getTransformFeedbackVarying() method of the WebGL 2 API returns information about varying variables from WebGLTransformFeedback buffers.
The WebGL2RenderingContext.renderbufferStorageMultisample() method of the WebGL 2 API returns creates and initializes a renderbuffer object's data store and allows specifying a number of samples to be used.