Graph 3D Internet Explorer 9 support

Graph3D uses the HTML Canvas element. This element is supported by all major browsers. The Canvas element is also supported in Internet Explorer 9 and newer. However, for Internet Explorer it is necessary to specify the doctype of the html page:


        <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
        <html>
        <head>
        <!-- ... -->
        </head>
        <body>
        <!-- ... -->
        </body>
        </html>