if (can(nav, 'doNotTrack')) {
        environment.dnt = (nav.doNotTrack === 'yes' || parseInt(nav.doNotTrack, 10) === 1) ? '1' : '0';
    } else if (can(nav, 'msDoNotTrack')) {
        environment.dnt = (nav.msDoNotTrack === 'yes' || parseInt(nav.msDoNotTrack, 10) === 1) ? '1' : '0';
    } else {