How to use the selector.headline6 function in selector

title: i18n['selector.headline1'],
                selector: ' h1'
            },{
                title: i18n['selector.headline2'],
                selector: ' h2'
            },{
                title: i18n['selector.headline3'],
                selector: ' h3'
            },{
                title: i18n['selector.headline4'],
                selector: ' h4'
            },{
                title: i18n['selector.headline5'],
                selector: ' h5'
            },{
                title: i18n['selector.headline6'],
                selector: ' h6'
            }]
        }];

        return globalSel;
    };