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chromium/third_party/blink/web_tests/external/wpt/shadow-dom/focus-navigation/reading-flow/tentative/grid-columns.html 

<!DOCTYPE html>
<meta charset="utf-8">
<meta name="timeout" content="long">
<title>CSS Display: reading-flow with value grid-columns</title>
<link rel="help" href="https://drafts.csswg.org/css-display-4/#reading-flow">
<link rel="author" title="Di Zhang" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src='../../resources/shadow-dom.js'></script>
<script src="../../resources/focus-utils.js"></script>

<style>
.wrapper {
  display: grid;
  grid-template-columns: repeat(3, 150px);
    grid-template-areas: "d b b"
                          "c c a";
  reading-flow: grid-columns;
}

.a { grid-area: a; }
.b { grid-area: b; }
.c { grid-area: c; }
.d { grid-area: d; }

</style>

<div class="test-case" data-expect="d1,c1,b1,a1"
      data-description="Grid items in grid template columns should follow grid-columns reading flow">
  <div class="wrapper">
    <button class="a" id="a1">Item A</button>
    <button class="b" id="b1">Item B</button>
    <button class="c" id="c1">Item C</button>
    <button class="d" id="d1">Item D</button>
  </div>
</div>


<script>
runFocusTestCases();
</script>