<!DOCTYPE html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
  <title>
    CSS Reference
  </title>
  <style>
    .box {
      display: flex;
      border: 1px solid black;
      margin: 5px 20px;
      float: left; /* For testing in "rows" */
      font: 10px serif;
    }
    .box > *:nth-child(1) {
      background: turquoise;
      margin: 2px 4px 6px 8px;
      border: 1px solid blue;
      padding: 4px 3px 2px 1px;
    }
    .box > *:nth-child(2) {
      background: salmon;
      margin: 9px 3px 7px 5px;
      border: 2px solid purple;
      padding: 6px 7px 8px 9px;
    }

    .rtl { direction: rtl; }

    .horizNormal {
      flex-direction: row;
    }
    .horizReverse {
      flex-direction: row-reverse;
    }
    .vertNormal {
      flex-direction: column;
    }
    .vertReverse {
      flex-direction: column-reverse;
    }
    br { clear: both; }
  </style>
</head>
<body>
  <!-- FIRST ROW: '-webkit-box-orient: horizontal', default 'direction' -->
  <div class="box horizNormal">
    <div>a</div><div>b</div>
  </div>
  <div class="box horizReverse">
    <div>a</div><div>b</div>
  </div>

  <br>

  <!-- SECOND ROW: '-webkit-box-orient: horizontal', 'direction: rtl' -->
  <div class="box horizNormal rtl">
    <div>a</div><div>b</div>
  </div>
  <div class="box horizReverse rtl">
    <div>a</div><div>b</div>
  </div>

  <br>

  <!-- THIRD ROW: '-webkit-box-orient: vertical', default 'direction' -->
  <div class="box vertNormal">
    <div>a</div><div>b</div>
  </div>
  <div class="box vertReverse">
    <div>a</div><div>b</div>
  </div>

  <br>

  <!-- FOURTH ROW: '-webkit-box-orient: vertical', 'direction: rtl' -->
  <div class="box vertNormal rtl">
    <div>a</div><div>b</div>
  </div>
  <div class="box vertReverse rtl">
    <div>a</div><div>b</div>
  </div>
</body>
</html>