in styles/docfx.js [482:499]
$('#toc li>a').filter(function (i, e) {
return $(e).siblings().length === 0
}).each(function (i, anchor) {
var text = $(anchor).attr('title');
var parent = $(anchor).parent();
var parentNodes = parent.parents('ul>li');
for (var i = 0; i < parentNodes.length; i++) {
var parentText = $(parentNodes[i]).children('a').attr('title');
if (parentText) text = parentText + '.' + text;
};
if (filterNavItem(text, val)) {
parent.addClass(show);
parent.removeClass(hide);
} else {
parent.addClass(hide);
parent.removeClass(show);
}
});