Gitter Channel Archive 17th of February 2016

function getSibling (event, direction) {     var tab = event.currentTarget;     var parent = tab.parentNode;     var sibling = null;      // nodeType === 1 is a element_node     switch (direction) {       case 'next':         sibling = parent.nextSibling;          while (sibling != null && sibling.nodeType != 1) {           sibling = sibling.nextSibling;         };          break;       case 'prev':         sibling = parent.previousSibling;          while (sibling != null && sibling.nodeType != 1) {           sibling = sibling.previousSibling;         };          break;     };      if (sibling != null) {       return sibling.querySelector('[role="tab"]');     };   };