in src/assets/js/main.js [1214:1224]
function updateAnchorActive() {
$anchors.removeClass('is-in-view');
$anchors.each(function () {
var $self = $(this);
var $el = $($self.attr('href'));
if ($el.length && isInFocus($el, 0.75)) {
$anchors.removeClass('is-in-view');
$self.addClass('is-in-view');
}
});
}