Definition
WebGL Specification defines WebGLRenderingContextOverloads
interface mixin WebGLRenderingContextOverloads
{
    undefined bufferData(GLenum target, GLsizeiptr size, GLenum usage);
    undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat,
                                   GLsizei width, GLsizei height, GLint border,
                                   [AllowShared] ArrayBufferView data);
    undefined compressedTexSubImage2D(GLenum target, GLint level,
                                      GLint xoffset, GLint yoffset,
                                      GLsizei width, GLsizei height, GLenum format,
                                      [AllowShared] ArrayBufferView data);
    undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height,
                         GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
                         GLsizei width, GLsizei height, GLint border, GLenum format,
                         GLenum type, [AllowShared] ArrayBufferView? pixels);
    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
                         GLenum format, GLenum type, TexImageSource source); // May throw DOMException
    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
                            GLsizei width, GLsizei height,
                            GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
                            GLenum format, GLenum type, TexImageSource source); // May throw DOMException
    undefined uniform1fv(WebGLUniformLocation? location, Float32List v);
    undefined uniform2fv(WebGLUniformLocation? location, Float32List v);
    undefined uniform3fv(WebGLUniformLocation? location, Float32List v);
    undefined uniform4fv(WebGLUniformLocation? location, Float32List v);
    undefined uniform1iv(WebGLUniformLocation? location, Int32List v);
    undefined uniform2iv(WebGLUniformLocation? location, Int32List v);
    undefined uniform3iv(WebGLUniformLocation? location, Int32List v);
    undefined uniform4iv(WebGLUniformLocation? location, Int32List v);
    undefined uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List value);
    undefined uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List value);
    undefined uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List value);
};