text: <!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: Clamp 'automatic minimum size' to definite max-sizing of block item with margin:auto</title>
    <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1300369">
    <style type="text/css">
  body,html { color:black; background:white; font:16px/1 monospace; padding:0; margin:0; }
  
  .grid {
    display: grid;
    grid-template-columns: repeat(2,minmax(auto, 15px));
    grid-template-rows:    repeat(2,minmax(auto, 10px));
    grid-gap: 1px;
    align-items: start;
    justify-items: start;
    float: left;
    border: 1px dashed;
    margin-right: 16px;
    margin-bottom: 14px;
  }
  .sz {
    width: 40px;
    height: 40px;
  }
  
  .definite {
    grid-template-columns: repeat(2,15px);
    grid-template-rows:    repeat(2,10px);
  }
  .min {
    grid-template-columns: repeat(2,minmax(min-content, 15px));
    grid-template-rows:    repeat(2,minmax(min-content, 10px));
  }
  .max {
    grid-template-columns: repeat(2,minmax(max-content, 15px));
    grid-template-rows:    repeat(2,minmax(max-content, 10px));
  }
  
  .larger .grid {
    grid-template-columns: repeat(2,minmax(auto, 25px));
    grid-template-rows:    repeat(2,minmax(auto, 28px));
  }
  .larger .definite {
    grid-template-columns: repeat(2,25px);
    grid-template-rows:    repeat(2,28px);
  }
  .larger .min {
    grid-template-columns: repeat(2,minmax(min-content, 25px));
    grid-template-rows:    repeat(2,minmax(min-content, 28px));
  }
  .larger .max {
    grid-template-columns: repeat(2,minmax(max-content, 25px));
    grid-template-rows:    repeat(2,minmax(max-content, 28px));
  }
  
  .stretch .grid {
    align-items: stretch;
    justify-items: stretch;
  }
  
  span {
    grid-area: 1 / 1;
    font-size: 48px;
    background: grey;
    background-clip: content-box;
    border: 1px solid;
    padding: 1px 3px 5px 7px;
    margin: 0;
  }
  .span2 {
    grid-area: 1 / 1 / span 2 / span 2;
  }
  .larger .grid .span2 {
    font-size: 32px;
  }
  
  .larger .grid span {
    align-self:center;
    justify-self:center;
  }
  .larger .grid .span2 {
    font-size: 32px;
    width: 20px;
    height: 32px;
  }
  .stretch.larger .grid .span2 {
    align-self:center;
    justify-self:center;
  }
  .stretch.larger .grid.sz .span2 {
    align-self:center;
    justify-self:center;
  }
  .stretch.larger .grid.definite .span2 {
    align-self:center;
    justify-self:center;
  }
  
  x {
    grid-area: 1 / 1;
    min-width: 0;
    min-height: 0;
    align-self: stretch;
    justify-self: stretch;
    background: cyan;
  }
  c {
    display: block;
    width: 20px;
    height: 32px;
  }
  
  br {
    clear: both;
  }
    </style>
  </head>
  <body>
  
  <div id="tests">
  <div class="grid"><x></x><span><c>X</c></span></div>
  <div class="grid definite"><x></x><span><c>X</c></span></div>
  <div class="grid"><x></x><span class="span2"><c>X</c></span></div>
  <div class="grid definite"><x></x><span class="span2"><c>X</c></span></div>
  
  <div class="grid sz"><x></x><span><c>X</c></span></div>
  <div class="grid sz definite"><x></x><span><c>X</c></span></div>
  <div class="grid sz"><x></x><span class="span2"><c>X</c></span></div>
  <div class="grid sz definite"><x></x><span class="span2"><c>X</c></span></div>
  
  <br>
  
  <div class="grid min"><x></x><span><c>X</c></span></div>
  <div class="grid min"><x></x><span class="span2"><c>X</c></span></div>
  <div class="grid sz min"><x></x><span><c>X</c></span></div>
  <div class="grid sz min"><x></x><span class="span2"><c>X</c></span></div>
  
  <div class="grid max"><x></x><span><c>X</c></span></div>
  <div class="grid max"><x></x><span class="span2"><c>X</c></span></div>
  <div class="grid sz max"><x></x><span><c>X</c></span></div>
  <div class="grid sz max"><x></x><span class="span2"><c>X</c></span></div>
  
  <br>
  
  </div>
  
  <script>
  var tests = document.getElementById('tests');
  
  var n = tests.cloneNode(true);
  var wrap = document.createElement('div');
  wrap.className = 'larger';
  wrap.appendChild(n);
  document.body.appendChild(wrap);
  
  var n = tests.cloneNode(true);
  var wrap = document.createElement('div');
  wrap.className = 'stretch';
  wrap.appendChild(n);
  document.body.appendChild(wrap);
  
  var n = tests.cloneNode(true);
  var wrap = document.createElement('div');
  wrap.className = 'stretch larger';
  wrap.appendChild(n);
  document.body.appendChild(wrap);
  
  </script>
  
  </body></html>
  