code: func (c *Overlay) HighlightRect(x int, y int, width int, height int, color *DOMRGBA, outlineColor *DOMRGBA) (*gcdmessage.ChromeResponse, error) {
  	var v OverlayHighlightRectParams
  	v.X = x
  	v.Y = y
  	v.Width = width
  	v.Height = height
  	v.Color = color
  	v.OutlineColor = outlineColor
  	return c.HighlightRectWithParams(&v)
  }
docs: // HighlightRect - Highlights given rectangle. Coordinates are absolute with respect to the main frame viewport.
  // x - X coordinate
  // y - Y coordinate
  // width - Rectangle width
  // height - Rectangle height
  // color - The highlight fill color (default: transparent).
  // outlineColor - The highlight outline color (default: transparent).