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chromium/third_party/blink/web_tests/fragmentation/thead-under-repeating-thead-expected.html 

<!DOCTYPE html>
<style>
td { border: 1px solid black; padding: 5px; }
table { border-spacing: 0; }
</style>
<div style="columns: 2">
  <table>
    <tr><td>
      <table>
        <tr><td>Inner</td></tr>
        <tr><td style="height: 100px"></td></tr>
      </table>
    </td></tr>
    <tr><td style="height: 600px"></td></tr>
    <tr><td>
      <table>
        <tr><td>Inner</td></tr>
        <tr><td style="height: 100px"></td></tr>
      </table>
    </td></tr>
    <tr><td style="height: 600px"></td></tr>
  </table>
</div>