<!DOCTYPE html>
<!--
 | This test checks that percentage values used for left/top on relatively
 | positioned elements is calculated relative to the element's parent
 | element (and not, for example, an absolute containing block).
 |   https://www.w3.org/TR/CSS21/visuren.html#relative-positioning
 -->
<html>
<head>
  <style>
    .container {
      width: 100px;
      height: 150px;

      background-color: rgb(100, 255, 100);
    }
    .box {
      width: 50px;
      height: 50px;

      background-color: rgb(100, 100, 255);
    }

    .position-relative {
      position: relative;
      left: 25px;
      top: 25px;

      background-color: rgb(255, 100, 100);
    }
  </style>
</head>

<body>
  <div class="container">
    <div class="box"></div>
    <div class="box position-relative"></div>
    <div class="box"></div>
  </div>
</body>
</html>