title: What effect do the different URL parameters of the Sphinx HTML output's search feature have?
body: <p>HTML documentation generated by Sphinx includes a search interface.</p>
  
  <p>For example, when searching in the official Python documentation for the term "popen", this URL is constructed:</p>
  
  <p><a href="https://docs.python.org/3/search.html?q=popen&amp;check_keywords=yes&amp;area=default" rel="noreferrer">https://docs.python.org/3/search.html?q=popen&amp;check_keywords=yes&amp;area=default</a></p>
  
  <p>What effect do the different URL parameters have?</p>