FabricJs FlipX FlipY testing

HTML

<body>
<canvas id="c" width="600" height="300"></canvas>
<input type="text" id="result"><input type="text" id="result2">
<button onclick="recup()">recup</button>
</body>

JavaScript

var canvas = new fabric.Canvas('c');
    

    var recta = new fabric.Rect({
      left: 80,
      top: 80,
      fill: 'red',
      width: 80,
      height: 40
    });
    
    var triangle = new fabric.Triangle({
      left: 100,
      top: 100,
      width: 40,
      height: 40,
      fill: 'blue'
    });
    

canvas.add(triangle);    
canvas.add(recta); 

canvas.renderAll(); 

function recup() { 
var obj = canvas.getActiveObject();

document.getElementById("result").value=(triangle.left + "," + triangle.top);
document.getElementById("result2").value=(recta.left + "," + recta.top);
}