MastodonStartpage/web/js/scrolltrack.js

function scrolltrack() {
	var i=anchors.length-1;
	var ruler=(window.innerHeight || document.documentElement.clientHeight) / 8;
	if ((window.innerHeight + window.pageYOffset) >= document.body.offsetHeight - 20) {
		document.getElementById(anchors[i]+'L').style.color='#97C3E9';
	} else {
		while (i>=0) {
			if (document.getElementById(anchors[i]).getBoundingClientRect().top<=ruler) {
				document.getElementById(anchors[i]+'L').style.color='#97C3E9';
				break;
			} else {
				document.getElementById(anchors[i]+'L').style.color='#3088D4';
			}
			i--;
		}
	}
	if (i>=0) {
//		console.log('Arrivati a: '+anchors[i]);
		document.getElementById(anchors[i]+'L').scrollIntoView({behavior: "smooth", block: "center"});
	}
	while (i>0) {
		i--;
		document.getElementById(anchors[i]+'L').style.color='#3088D4';
	}
}