wikipedia_renovation_test_page.html

<html>
  <body>
    <div class="collapsible-block" id="block1"></div>
    <div class="collapsible-block" id="block2"></div>
    <h2 class="collapsible-heading" id="heading1"></div>
    <h2 class="collapsible-heading" id="heading2"></div>
  </body>
</html>

chromium/components/test/data/offline_pages/wikipedia_renovation_test_page.html