Print html from IFRAME

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script>
        function callPrint() {
            document.getElementById("frm1").contentWindow.myPrint();
         // window.frames[0].frameElement.contentWindow.myPrint();
        }
        </script>
</head>
<body>
    <form runat="server">
        <input type="button" onclick="callPrint()" value="Print" />
        <iframe id="frm1" src="http://localhost:4398/HtmlPage1.html" width="1300px;"></iframe>
    </form>
</body>
</html>

--------------------------------------------------------------
<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8" />
    <script>
        window.myPrint = function () {
            window.print();
        }
    </script>
</head>

<body>
    <table>
        <tr>
            <td>
                dsfgbsdgbdgbsdfg
            </td>
        </tr>
    </table>
</body>
</html>