<!DOCTYPE html>
<html>
<body>
iFrame Test. Thanks to DocumentRoot.
<img id="display" width="100%">
<iframe id="iframe" sandbox="allow-same-origin" style="display:none"></iframe>
<script>
(function(){
document.getElementById("display").src = after();
}());
function after(){
var fp_text = "BrowserLeaks,com <canvas> 10";
// create window canvas
var canvas = document.createElement('canvas');
canvas.setAttribute("width", 220);
canvas.setAttribute("height", 30);
// draw image in window canvas
var ctx = canvas.getContext('2d');
ctx.textBaseline = "top";
ctx.font = "14px 'Arial'";
ctx.textBaseline = "alphabetic";
ctx.fillStyle = "#f60";
ctx.fillRect(125, 1, 62, 20);
ctx.fillStyle = "#069";
ctx.fillText(fp_text, 2, 15);
ctx.fillStyle = "rgba(102, 204, 0, 07)";
ctx.fillText(fp_text, 4, 17);
// create iframe canvas and ctx
var iframe_canvas = document.getElementById("iframe").contentDocument.createElement('canvas');
iframe_canvas.setAttribute("width", 220);
iframe_canvas.setAttribute("height", 30);
var iframe_ctx = iframe_canvas.getContext('2d');
// copy image from window canvas to iframe ctx
iframe_ctx.drawImage(canvas, 0, 0);
return iframe_canvas.toDataURL();
}
</script>
</body></html>