tutorial-dropmenu/dropmenu_03.html at master · ptrdo/tutorial-dropmenu · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
  <title>Drop Menu: Step 3</title>
  <link rel="stylesheet" href="css/dropmenu.css">
  <style type="text/css">

    dl.drop-menu
    {
      position: absolute;
      left: 50%;
      margin-top: 30px;
      margin-left: -80px;
      z-index: 1;
    }

    dl.drop-menu dd
    {
      margin-top: -50px;
      transition-property: margin-top;
      transition-duration: 200ms;
      transition-timing-function: ease-in;
    }

    dl.drop-menu:hover dd
    {
      margin-top: -1px;
      transition-duration: 300ms;
      transition-timing-function: ease-out;
    }

  </style>
</head>
<body>
<nav>
  <dl class="drop-menu">
    <dt>Days of the Week</dt>
    <dd>Monday</dd>
    <dd>Tuesday</dd>
    <dd>Wednesday</dd>
    <dd>Thursday</dd>
    <dd>Friday</dd>
    <dd>Saturday</dd>
    <dd>Sunday</dd>
  </dl>
</nav>
<section>
  <p>A CSS Drop Menu.</p>
</section>
<script>

/* DROP-CSS
 *
 * 1. This works great except that the menu <dd> elements are stacked on top of the <dt> title.
 * 2. This can be very easily resolved by introducing a z-index to force the <dt> to the top.
 * 3. Add the following set of rules:

      dl.drop-menu dt
      {
        position: relative;
        z-index: 1;
      }

 * 4. The position rule is required for the z-index to take effect.
 * 5. Any number can be used, but it's okay to stay small.
 * 6. Are there other properties that could be transitioned? Try some.
 *
 */

</script>
</body>
</html>