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chromium/third_party/blink/web_tests/external/wpt/css/cssom/getComputedStyle-insets-grid.html 

<!doctype html>
<title>Position absolute getComputedStyle left (for display: grid)</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-value">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=867616">
<link rel="author" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>

span { display: grid; grid-template-columns: 100px 100px; }
span { position: absolute; grid-column: 2; }

</style>

<span>abc<span>def</span></span>

<script>
var test_description = document.title;
promise_test(t => {
  return new Promise(test => addEventListener('load', e=>test()))
      .then(test => assert_equals(
          getComputedStyle(document.querySelector("body > span > span"))['left'], "0px",
          "Invalid gCS($(\"body > span > span\"))['left'];"));
}, test_description);
</script>