Edit in JSFiddle

Result
HTML
JavaScript

<html>
    <head><title>command tag in html5</title>
    </head>
            <body>
                <menu>
                    <command id="save" onclick="Save()">Save</command>
                    <p><strong>Note :</strong>The command tag is only supported in IE 9 browser</p>
                </menu>
                <input type="button" command="save" value="Save Form" />
            </body>
</html>

function Save()
{
    alert("Hello world")
}