<!DOCTYPE HTML>
<!--
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<html><head>
  <meta charset="utf-8">
  <title>Reference: subgrid auto track sizing</title>
  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1558705">
  <style>
html,body {
  color:black; background-color:white; font:16px/1 monospace; padding:0; margin:0;
}

.grid {
  display: grid;
  max-width: 260px;
  padding: 1px 5px;
  border: