1. DomName('WebGL2RenderingContext.copyTexImage2D')
  2. DocsEditable()
  3. Experimental()
void copyTexImage2D(int target, int level, int internalformat, int x, int y, int width, int height, int border)

Source 

@DomName('WebGL2RenderingContext.copyTexImage2D')
@DocsEditable()
@Experimental() // untriaged
void copyTexImage2D(int target, int level, int internalformat, int x, int y, int width, int height, int border) => _blink.BlinkWebGL2RenderingContext.instance.copyTexImage2D_Callback_8_(this, target, level, internalformat, x, y, width, height, border);