Gracefully handle the unavailability of Typekit

gistfile1.js

if (typeof Typekit != 'undefined') {
    try { 
        Typekit.load({
            active: function() {
                // it worked. carry on ...
            }
        }); 
    } catch(e) {
        // probably want to fall back to no typekit
        $('html').addClass('wf-inactive').removeClass('wf-loading');
    }
} else {
    // typekit js is unavailable; so set html to wf-inactive class
    $('html').addClass('wf-inactive').removeClass('wf-loading');
}