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chromium/third_party/blink/web_tests/fast/css-grid-layout/crash-animate-subgrid.html 

<!DOCTYPE html>
<title>Animating a grid columns to subgrid does not crash</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<div id="target"></div>
<script>
  test(() => {
    target.style.gridTemplateColumns = '100px 200px';
    var animation = target.animate([{}, {gridTemplateColumns: '200px 300px'}], 1000);
    animation.pause();
    animation.currentTime = 500;
    target.style.gridTemplateColumns = 'subgrid [x] [y] [z] [y] [z]';
  }, 'Animating to a subgrid does not crash');
</script>