My Solution for Rollercoaster

[Juan Marchese]

var text = 'Hello World!';
var div = document.getElementById('rollercoaster');
var size = 10

function sizeMatters(a){  
  if (a < 5 && a != 0){
    size += 5;
    var sizeString = size + "px";
    spanElement.style.fontSize = sizeString;
  } else {
    size -= 5;
    var sizeString = size + "px";
    spanElement.style.fontSize = sizeString;
  }
 };

for (var i = 0; i<text.length; i++) {
  var spanElement = document.createElement('SPAN');
  div.appendChild(spanElement);
  var one = text[i];
  spanElement.appendChild(document.createTextNode(one));
  sizeMatters(i);
};