html5 video tag not working on Windows

I've created a new html5 app project and modified default index page to add video tag (see code below). It works on Mac but not on Windows. How can I get it to work in Windows?
I am using Qt 4.8.4(3) and Qt Creator 2.6.0 on Mac OS X 10.8.2 and Windows 7.

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <style type="text/css">
            body { margin: 0; font-size: 2em; background-color: white; }
            h1 { text-align: center; color: red; }
            h1 + h1 { color: green; }
            h1:last-child { color: blue; }
            #quit { background-color: gray; color: white; font-weight: bold; display: block; text-align: right; }
        </style>
        <script type="text/javascript">
            var counter = 0;
            function toggleElement()
            {
                var elements = document.getElementsByTagName('h1');
                for (var i = 0; i < elements.length; ++i)
                    elements[i].style.display = (counter % elements.length) == i ? '' : 'none';
                counter++;
                setTimeout('toggleElement()', 1000);
            }
            window.onload = function()
            {
                document.getElementById("quit").onmousedown = function()
                {
                    Qt.quit();
                };
                toggleElement();
            }
        </script>
    </head>
    <body>
        <a id="quit">X</a>
        <h1>Hello</h1>
        <h1>HTML5</h1>
        <h1>World</h1>
 
        <video width="320" height="240" controls>
          <source src="http://www.w3schools.com/html/movie.mp4" type="video/mp4">
          Your browser does not support the video tag.
        </video>
 
    </body>
</html>

Thanks!

Re: html5 video tag not working on Windows

Hi,

I am facing the same problem on win 7. How come nobody is answering this??? I think this is critical. Hope some of the Masters turn their attention to this.

Sky.

Re: html5 video tag not working on Windows

Try changing the following tags:
Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
to
Code:

<!DOCTYPE html>
and
Code:

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
to
Code:

<html>
From what I've seen Windows version is more restrictive than Linux version.

Also, from what I know html5 pages are contained in
Code:

<!DOCTYPE html> <html> </html>