1. DomName('WebGL2RenderingContext.readPixels')
  2. DocsEditable()
  3. Experimental()
void readPixels(int x, int y, int width, int height, int format, int type, TypedData pixels)

Source 

@DomName('WebGL2RenderingContext.readPixels')
@DocsEditable()
@Experimental() // untriaged
void readPixels(int x, int y, int width, int height, int format, int type, TypedData pixels) => _blink.BlinkWebGL2RenderingContext.instance.readPixels_Callback_7_(this, x, y, width, height, format, type, pixels);