in static/js/scroll-apiref.js [169:175]
setTimeout(function() {
var scrollPosition = $(window).scrollTop();
var activeSectionTokens = scrollActions(scrollPosition);
var activeElemToken = checkActiveElement(flatToc, scrollPosition);
var navNode = $('#sidebar-wrapper > ul a[href="#' + token + '"]');
$('#sidebar-wrapper').scrollTo(navNode, {duration: 'fast', axis: 'y'});
}, 200);