1. DomName('WebGLRenderingContext.texSubImage2DCanvas')
  2. DocsEditable()
void texSubImage2DCanvas(int target, int level, int xoffset, int yoffset, int format, int type, CanvasElement canvas)

Source 

@DomName('WebGLRenderingContext.texSubImage2DCanvas')
@DocsEditable()
void texSubImage2DCanvas(int target, int level, int xoffset, int yoffset, int format, int type, CanvasElement canvas) => _blink.BlinkWebGLRenderingContext.instance.texSubImage2D_Callback_7_(unwrap_jso(this), target, level, xoffset, yoffset, format, type, unwrap_jso(canvas));