pdf.js not working with <!DOCTYPE HTML>

Question

I'm using PDF.js to preview a PDF doc in my page.

I't works perfectly without doctype on top of the page. But when I add it, the PDF viewer stops working.

My doctype:

<!DOCTYPE HTML>

Where I call the viewer:

echo '<div id="pdfViewer">';
    include('pdf_viewer.php');
echo '</div>';

CSS style of the pdfViewer division:

#pdfViewer {
   margin: 10px;
}

How can I add the doctype declaration and still keep my viewer working?

Answer 1

The problem was indeed that the parent didn't have a height.

example:

#pdfViewer {height: 800px;}