in styles/docfx.js [384:409]
$('#navbar').find('a[href]').each(function (i, e) {
var href = $(e).attr("href");
if (util.isRelativePath(href)) {
href = navrel + href;
$(e).attr("href", href);
var isActive = false;
var originalHref = e.name;
if (originalHref) {
originalHref = navrel + originalHref;
if (util.getDirectory(util.getAbsolutePath(originalHref)) === util.getDirectory(util.getAbsolutePath(tocPath))) {
isActive = true;
}
} else {
if (util.getAbsolutePath(href) === currentAbsPath) {
var dropdown = $(e).attr('data-toggle') == "dropdown"
if (!dropdown) {
isActive = true;
}
}
}
if (isActive) {
$(e).addClass(active);
}
}
});