<!DOCTYPE html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
  <meta charset="utf-8">
  <title>Reference: Testing safe overflow-position for align-self and justify-self in absolutely positioned boxes in grid containers in both horizontal and vertical writing modes</title>
  <link rel="author" title="Mihir Iyer" href="mailto:miyer@mozilla.com">
  <style>
    .container {
      display: grid;
      padding: 2px 1px;
      border: 1px solid black;
      background: yellow;
      margin-bottom: 5px;
      margin-right: 5px;
      float: left; /* For testing in "rows" of containers */
      position: relative;
      width: 30px;
      height: 25px;
      grid: 3px 14px 3px / 2px 20px 2px;
    }
    br { clear: both }
    .container > * {
      position: absolute;
      grid-area: 2 / 2 / 3 / 3;
      background: teal;
      width: 21px;
      height: 21px;
      justify-self: start;
      align-self: start;
    }
    .vertRL {
      writing-mode: vertical-rl;
    }
    .relPos {
      position: relative;
    }
    .relPos > * {
      height: 35px;
      width: 33px;
    }
  </style>
</head>
<body>
  <div class="container vertRL"><div></div></div>
  <div class="container"><div></div></div>
  <div class="container relPos vertRL"><div></div></div>
  <div class="container relPos"><div></div></div>
</body>
</html>