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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/grid-definition/grid-auto-repeat-dynamic-001.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#auto-repeat">
<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="Checks that a dynamic change in containing block width changes the number of auto repeat columns.">
<p>Test passes if there is a filled green square.</p>
<div id="target" style="width: 0px; height: 100px;">
  <div style="display: inline-grid; background: green; height: 100px; min-width: 60%; grid-template-columns: repeat(auto-fill, 50px);"></div>
</div>
<script>
document.body.offsetTop;
document.getElementById('target').style.width = '100px';
</script>