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

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Display: reading-flow with value grid-order on shadow host</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;
  reading-flow: grid-order;
}
</style>

<!-- Since C is a direct reading flow item, it is visited first. -->
<!-- Since B,A are inside a display: contents, they are visited after. -->
<div class="test-case" data-expect="C,B,A"
      data-description="Grid items in shadow host that is a display contents grid item">
  <div class=wrapper>
    <div style="display: contents">
      <template shadowrootmode=open>
        <slot></slot>
      </template>
      <button id="A" style="order: 2">A</button>
      <button id="B" style="order: 1">B</button>
    </div>
    <button id="C" style="order: 3">C</button>
  </div>
</div>

<script>
runFocusTestCases();
</script>