title: jsPdf using html2canvas.js: Uncaught Error: Supplied data is not a JPEG
body: <p>I am using jsPDF and html2Canvas to generate a PDF.</p>
  
  <p>It works if I target the document.body. </p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
    function pdfDownload() {
    var pdf = new jsPDF('p', 'pt', 'a4');
    pdf.addHTML(document.body, function () {
    pdf.save('test.pdf');
    });
  }&lt;/script&gt;
  </code></pre>
  
  <p>However if I try to use an id on a div #pdfcontent I get:</p>
  
  <p>"Uncaught Error: Supplied data is not a JPEG"</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
    function pdfDownload() {
    var pdf = new jsPDF('p', 'pt', 'a4');
    pdf.addHTML($('#pdfcontent')[0], function () {
    pdf.save('test.pdf');
    });
  }&lt;/script&gt;
  </code></pre>
  
  <p>Help please</p>