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

<!DOCTYPE html>
<html class="reftest-wait">
<title>Updating font-display value while loading</title>
<script>

window.onload = () => {
    const displayValues = [ 'auto', 'block', 'swap', 'fallback', 'optional' ];

    for (let value of displayValues) {
        let face = new FontFace(value,
                                'url("/fonts/Ahem.ttf?pipe=trickle(d5)")',
                                {display: value});
        document.fonts.add(face);
        face.load();
    }

    setTimeout(() => {
        document.documentElement.classList.remove("reftest-wait");
    }, 200);
};

</script>
<table>
  <tr>
    <th>auto</th>
    <th>block</th>
    <th>swap</th>
    <th>fallback</th>
    <th>optional</th>
  </tr>
  <tr>
    <td>from auto</td>
    <td style="font-family: auto">a</td>
    <td style="font-family: block">a</td>
    <td style="font-family: swap">a</td>
    <td style="font-family: fallback">a</td>
    <td style="font-family: optional">a</td>
  </tr>
  <tr>
    <td>from block</td>
    <td style="font-family: auto">a</td>
    <td style="font-family: block">a</td>
    <td style="font-family: swap">a</td>
    <td style="font-family: fallback">a</td>
    <td style="font-family: optional">a</td>
  </tr>
  <tr>
    <td>from swap</td>
    <td style="font-family: auto">a</td>
    <td style="font-family: block">a</td>
    <td style="font-family: swap">a</td>
    <td style="font-family: fallback">a</td>
    <td style="font-family: optional">a</td>
  </tr>
  <tr>
    <td>from fallback</td>
    <td style="font-family: auto">a</td>
    <td style="font-family: block">a</td>
    <td style="font-family: swap">a</td>
    <td style="font-family: fallback">a</td>
    <td style="font-family: optional">a</td>
  </tr>
  <tr>
    <td>from optional</td>
    <td style="font-family: auto">a</td>
    <td style="font-family: block">a</td>
    <td style="font-family: swap">a</td>
    <td style="font-family: fallback">a</td>
    <td style="font-family: optional">a</td>
  </tr>
</table>
</html>