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<!DOCTYPE html>
<!--
SPDX-FileCopyrightText: Chris Pressey, the original author of this work, has dedicated it to the public domain.
For more information, please refer to <https://unlicense.org/>
SPDX-License-Identifier: Unlicense
-->
<head>
  <meta charset="utf-8">
  <title>Infinite Scroll</title>
  <style>
#scroller {
    width: 420px;
    height: 280px;
    border: 1px solid blue;
    overflow: auto;
}
  </style>
</head>
<body>

<h1>Infinite Scroll (inside a <code>div</code>)</h1>

<div id="scroller">
  <div id="inner">
  </div>
</div>

<p id="info"></p>

</body>
<script>
  var addMoreContent = function(elem) {
      var content = [
          'Lever',
          'Pulley',
          'Wheel and Axle',
          'Inclined Plane',
          'Screw',
          'Wedge'
      ][Math.floor(Math.random() * 6)];
      elem.innerHTML += '<p>' + content + '!</p>';
  };

  var scroller = document.getElementById('scroller');
  var inner = document.getElementById('inner');
  var info = document.getElementById('info');
  for (var i = 0; i < 20; i++) {
      addMoreContent(inner);
  }
  scroller.onscroll = function(e) {
      var scrollBottom = scroller.scrollTop + scroller.offsetHeight;
      info.innerHTML = 'scroll (bottom): ' + scrollBottom + ', height: ' + inner.offsetHeight;
      if (scrollBottom >= inner.offsetHeight) {
          addMoreContent(inner);
      }
  };
</script>