nline-size: 20px;
    block-size: 15px;
    background: pink;
  }

  .vrl {
    writing-mode: vertical-rl;
  }
  .vlr {
    writing-mode: vertical-lr;
  }
  .srl {
    writing-mode: sideways-rl;
  }
  .slr {
    writing-mode: sideways-lr;
  }
  .htb {
    writing-mode: horizontal-tb;
  }

  .ltr {
    direction: ltr;
  }
  .rtl {
    direction: rtl;
  }

  .sep {
    clear: both;
    display: block;
    height: 5px;
  }
</style>
<body>
  <div class="cb htb ltr">
    <div class="parent slr ltr">
      <div c