css/css-grid/grid-item-non-auto-height-stretch-002.html

<!doctype html>
<title>Grid items only stretch if block-size computes to auto</title>
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4525">
<link rel="help" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="help" href="https://mozilla.org" title="Mozilla">
<link rel="match" href="grid-item-non-auto-height-stretch-ref.html">
<style>
#grid {
  writing-mode: vertical-lr;
  display: grid;
  width: 100px;
  height: 100px;
  grid-template: 100% / 100%;
  background: green;
}
#item {
  width: max-content;
  background: red;
}
</style>
<div id="grid">
  <div id="item"></div>
</div>