title: html2canvas not working in FireFox and IE 11 for Google Material Charts
body: <p>I want to download the Google Material charts image. But the function getImageUri not supported in material charts right now. So i did some google search and found out html2canvas lib for doing this. the below mentioned code working fine in Chrome but not in FireFox and IE.</p>
  
  <pre><code>     html2canvas($(".Tab1"), {
              onrendered: function(canvas) {
                  var myImage = canvas.toDataURL("image/png");
                  window.open(myImage);
                  }
  });
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Bt4RZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Bt4RZ.png" alt="enter image description here"></a></p>
  
  <p>The above picture taken from Firefox. In IE only empty browser showing..
  Can anyone help me to resolve this issue.</p>