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chromium/third_party/blink/web_tests/external/wpt/html/rendering/the-details-element/summary-in-ol.html 

<!DOCTYPE html>
<title>Check if SUMMARY has 'counter-increment: list-item 0'</title>
<link rel="match" href="summary-in-ol-ref.html">

<ol>
 <details><summary>summary</summary></details>
 <li>1</li>
 <li>2 <details><summary>summary</summary></details></li>
 <li>3</li>
 <details><summary>summary</summary></details>
 <li>4</li>
</ol>

<ol>
 <summary>summary</summary>
 <li>1</li>
 <li>2 <summary>summary</summary></li>
 <li>3</li>
 <summary>summary</summary>
 <li>4</li>
</ol>