<!DOCTYPE html>
<!--
 | This is a simple relative positioning test which checks that the element,
 | with a display of inline-block, is offset from its standard in-flow position,
 | and does not affect the layout of surrounding elements in the flow.
 |   https://www.w3.org/TR/CSS21/visuren.html#relative-positioning
 -->
<html>
<head>
  <style>
    .box {
      display: inline-block;
      width: 50px;
      height: 50px;

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

    .position-relative {
      display: inline-block;
      position: relative;
      left: 25px;
      top: 25px;

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

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