How to make text appear on scroll in html

Question

Hello, I want a certain text to appear when I scroll past it or when I scroll until the point where the text is. The effect when appearing should be somewhat like the first effe

Answer 1

I like this:

var doc = document, dE = doc.documentElement, bod = doc.body;
function E(e){
  return doc.getElementById(e);
}
function xy(e, d){
  if(!d)d = 'Top';
  d = 'offset'+d;
  var r = e[d];
  while(e.offsetParent){
    e = e.offsetParent; r += e[d];
  }
  return r;
}
function x(e){
  return xy(e, 'Left');
}
function y(e){
  return xy(e);
}
var txt = E('theId'), txtS = txt.style;
onscroll = function(){
  var left = dE.scrollLeft || bod.scrollLeft || 0;
  var top = dE.scrollTop  || bod.scrollTop  || 0;
  var w = innerWidth || dE.clientWidth || bod.clientWidth;
  var h = innerHeight || dE.clientHeight || bod.clientHeight;
  if(top > y(txt)-h){
    txtS.display = 'none';
  }
  else{
    txtS.display = 'block';
  }
}

I left the left stuff in there, just in case, but you can probably remove it.