<!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;
      flex-direction: column;
      border: 1px solid black;
      margin: 5px 20px;
      float: left; /* For testing in "rows" */
      font: 10px serif;
    }
    .box > *:nth-child(1) {
      background: turquoise;
      /* auto width */
      height: 1em;
    }
    .box > *:nth-child(2) {
      background: salmon;
      font-size: 50%;
      width: 2em;
      /* auto height */
    }

    .bpstart   { justify-content: flex-start;    }
    .bpcenter  { justify-content: center;        }
    .bpend     { justify-content: flex-end;      }
    .bpjustify { justify-content: space-between; }
    br { clear: both; }
  </style>
</head>
<body>
  <!-- FIRST ROW: Default -webkit-box-pack -->
  <!-- intrinsically sized -->
  <div class="box">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra width -->
  <div class="box" style="width: 36px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height -->
  <div class="box" style="height: 40px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height and width -->
  <div class="box" style="width: 36px; height: 40px">
    <div>a</div><div>b</div>
  </div>
  <br>

  <!-- SECOND ROW:  -webkit-box-pack: start -->
  <!-- intrinsically sized -->
  <div class="box bpstart">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra width -->
  <div class="box bpstart" style="width: 36px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height -->
  <div class="box bpstart" style="height: 40px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height and width -->
  <div class="box bpstart" style="width: 36px; height: 40px">
    <div>a</div><div>b</div>
  </div>
  <br>

  <!-- THIRD ROW:  -webkit-box-pack: center -->
  <!-- intrinsically sized -->
  <div class="box bpcenter">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra width -->
  <div class="box bpcenter" style="width: 36px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height -->
  <div class="box bpcenter" style="height: 40px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height and width -->
  <div class="box bpcenter" style="width: 36px; height: 40px">
    <div>a</div><div>b</div>
  </div>
  <br>

  <!-- FOURTH ROW:  -webkit-box-pack: end -->
  <!-- intrinsically sized -->
  <div class="box bpend">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra width -->
  <div class="box bpend" style="width: 36px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height -->
  <div class="box bpend" style="height: 40px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height and width -->
  <div class="box bpend" style="width: 36px; height: 40px">
    <div>a</div><div>b</div>
  </div>
  <br>

  <!-- FIFTH ROW:  -webkit-box-pack: justify -->
  <!-- intrinsically sized -->
  <div class="box bpjustify">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra width -->
  <div class="box bpjustify" style="width: 36px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height -->
  <div class="box bpjustify" style="height: 40px">
    <div>a</div><div>b</div>
  </div>

  <!-- explicit size, extra height and width -->
  <div class="box bpjustify" style="width: 36px; height: 40px">
    <div>a</div><div>b</div>
  </div>
  <br>

</body>
</html>