Defines how tooltips are positions. The .tooltip can be either 'top', 'bottom', 'left', 'right' and define how tooltip will be displayed. You will still need to set .tooltip of each tab for which you need tooltip. You can defined it during object creation: let tabs = new w2tabs({ name: 'tabs', tooltip: 'bottom', tabs: [ { id: 'tab1', text: 'Tab 1', tooltip: 'Tab 1 tooltip' }, { id: 'tab2', text: 'Tab 2', tooltip: 'Tab 2 tooltip' } ] }); Or any time during run-time: w2ui.tabs.tooltip = 'top'; No refresh is needed