var markers = document.getElementsByClassName("catchup-marker");
var observer = new MutationObserver(function(){ var markers = document.getElementsByClassName("catchup-marker");
for(var i = 0; i < markers.length; i++){
markers[i].className = markers[i].className.split(/catchup-marker-*\s*\d*/).join("");
}});
observer.observe(document.getElementById("chat"), {attributes: true, childList: true, characterData: true});