in fauxton-visual-guide/js/main.js [218:230]
$('#using-fauxton .toc a, .fauxton-toc .icon-menu a').click(function (e) {
clearAll();
if ($(this).hasClass('subheading')) {
e.stopPropagation();
}
var href = $(this).attr('href');
var address = href.substring(1);
$('#toc-' + address).addClass('selected');
$('.icon-menu-'+ address).addClass('selected');
});