Get Bounding Box with Fabric.js

gets the bounding box of text with fabric.js canvas

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.4.0/fabric.min.js"></script>
<canvas id="canvas" width="800" height="300" style="border:1px solid #d3d3d3; position: absolute;">
Your browser does not support the canvas element.
</canvas>

JavaScript

var canvas = new fabric.Canvas('canvas');
      canvas.setBackgroundImage('bg.png', canvas.renderAll.bind(canvas), {
        left: 0,
        top: 0,
        originX: 'left',
        originY: 'top'
      });
      var text = new fabric.Text("Rage Against the Machine ● Lana Del Rey ● Frank Ocean", {
          left: 20,
          top: 20,
          fontFamily: 'Staatliches',
          fontSize: 48,
          fontColor: black
      });
      canvas.add(text);