title: disable scrolling up past specific point
body: <p>How can I make it so that a viewer cannot scroll <strong>up</strong> (past a specific point)?</p>
  <p>Making it so a viewer cannot scroll is easy with:</p>
  <pre><code>body{
      overflow: hidden;
  }
  </code></pre>
  <p>but that disables scrolling down too.</p>
  <h1>Detailed description</h1>
  <p>what I want is some javascript/jquery code that will not allow scrolling up past a given parameter, while the viewer can still scroll up and down before that parameter is reached, but after it is reached they can only scroll up <strong>as long as it's not scrolling up past the given parameter</strong></p>
  <p>I have absolutely no idea how to go about doing this, any ideas?</p>