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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/contain-style-counters-003.html 

<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Containment Test: 'contain: style' for counters (span children of &lt;body&gt;)</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-contain-1/#containment-style">
  <link rel="match" href="reference/contain-style-counters-003-ref.html">


  <style>
  body
    {
      counter-reset: counter-of-span 17;
    }

    /*
    This creates a new counter identified as "counter-of-span"
    and initially sets such counter to 17 (an entirely
    arbitrary number)
    */

  body
    {
      contain: style;
    }

    /*
    This will reset the counter to 0.
    */

  body span
    {
      counter-increment: counter-of-span 4;
    }

    /*
    This increments the counter identified as "counter-of-span"
    of the step value of 4 (an entirely arbitrary number) each
    and every time there is a <span> descendant within the subtree
    of body
    */

  div
    {
      font-size: 3em;
    }

  div::after
    {
      content: counter(counter-of-span);
    }

    /*
    Now, the generated content after the span is set to the
    current value of the counter identified as "counter-of-span"
    */
  </style>

  <body>

  <span></span> <span></span> <span></span> <span></span> <span></span>

  <!-- 5 span above -->

  <p>Test passes if there is the number 20.

  <div></div>