1. @DomName('WebGLRenderingContext.copyTexSubImage2D')
  2. @DocsEditable()
void copyTexSubImage2D(int target, int level, int xoffset, int yoffset, int x, int y, int width, int height)

Source

@DomName('WebGLRenderingContext.copyTexSubImage2D')
@DocsEditable()
void copyTexSubImage2D(int target, int level, int xoffset, int yoffset, int x,
    int y, int width, int height) native;