LayoutTests/fast/css-grid-layout/gridmatrix-columnSize-failure.html

<style>
  html, body {
    display: grid;
  }
  body {
    grid-template-rows: subgrid repeat(3, []);
  }
</style>
<script>
  onload = () => {
    if (window.testRunner)
           testRunner.dumpAsText();
  };
</script>