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chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/font-display/font-display-preload-ref.html 

<!DOCTYPE html>
<html>
<title>font-display should work for preloaded fonts</title>
<style>
  .arial {
    height: 20px;
    font-family: Arial;
  }
</style>
<div id="container">
  <div class="arial"></div>
  <div class="arial"></div>
  <div class="arial">Swap</div>
  <div class="arial">Fallback</div>
  <div class="arial">Optional</div>
</div>
</html>