Html2canvas image capturing issue with UTF-8 characters

I want to capture my webpage, In order to this I find html2canvas, when I use as shown below ,my UTF-8 (persian) characters get in trouble and this direction destroyed as you see.

HTML:

   <div id="wrapper">
        <span>این کاراکتر ها بهم میریزند</span>
    </div>

JavaScript:

$(document).ready(function() {
    html2canvas($("#wrapper"), {
        onrendered: function (canvas) {
            theCanvas = canvas;

            document.body.appendChild(canvas);

            canvas.toBlob(function (blob) {
                saveAs(blob, "Dashboard.png");
            });
        }
    });     
});

WebPage:

Captured WebPage via html2canvas:

you can see full example here

What is wrong with my implementation?

Answer

Set the box css that have trouble to :

text-align: left; //or right or justify

that work for me.