1. @DomName('CanvasRenderingContext2D.ellipse')
  2. @DocsEditable()
  3. @Experimental()
void ellipse(num x, num y, num radiusX, num radiusY, num rotation, num startAngle, num endAngle, bool anticlockwise)

Source 

@DomName('CanvasRenderingContext2D.ellipse')
@DocsEditable()
@Experimental() // untriaged
void ellipse(num x, num y, num radiusX, num radiusY, num rotation,
        num startAngle, num endAngle, bool anticlockwise) =>
    _blink.BlinkCanvasRenderingContext2D.instance.ellipse_Callback_8_(this, x,
        y, radiusX, radiusY, rotation, startAngle, endAngle, anticlockwise);