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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Display: reading-order-items with value grid-order on iframe</title>
<link rel="help" href="https://drafts.csswg.org/css-display-4/#reading-order-items">
<link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
<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-order-items: grid-order;
}
</style>

<div class="test-case" data-expect="start,frame2/B,frame1/A,end"
      data-description="Grid items are iframes.">
  <button id="start">Item Start</button>
  <div class="wrapper">
    <iframe id="frame1" style="order: 2" srcdoc="<button id=A>A</button>"></iframe>
    <iframe id="frame2" style="order: 1" srcdoc="<button id=B>B</button>"></iframe>
  </div>
  <button id="end">Item End</button>
</div>

<script>
window.onload = runFocusTestCases;
</script>