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chromium/third_party/blink/web_tests/external/wpt/avif/animated-avif-timeout.html 

<html class="reftest-wait">
<title>Animated AVIF: Second frame displays quickly, replacing red with green.</title>
<link rel="match" href="animated-avif-timeout-ref.html"/>
<img src=../images/animated-avif.avif onload="loaded()" style="height:500px"/>
<script>
  function loaded() {
    setTimeout(function() {
      document.documentElement.classList.remove("reftest-wait");
    }, 1000);
  }
</script>