are class="" supported for links in xml file ?

<script>
        // Set up Window for NW.js 0.12.3- and 0.13.0+
        if (typeof(nw) == "undefined") {
            window.nw = require('nw.gui');
        }


        //* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        //### D05. Launch links in default browser (from UGUI.io)
        //
        //>Detects all links on the page with a class of `external-link`
        // and sets them to open the link in the user's default browser
        // instead of using NW.js as a browser which can cause issues.


        function openDefaultBrowser () {
            //Remove all click events before rebinding to prevent opening a link multiple times per click.
            $('.external-link').unbind('click');


            //Open URL with default browser.
            $('.external-link').click( function (event) {
                //Prevent the link from loading in NW.js
                event.preventDefault();
                //Get the `href` URL for the current link
                var url = $(this).attr('href');
                //Launch the user's default browser and load the URL for the link they clicked
                nw.Shell.openExternal(url);
            });
        }


        //Run once on page load
        openDefaultBrowser();
    </script>