override-to-optional.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /document-policy/font-display/override-to-optional.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html class="reftest-wait">

<title>Test for no-font-display-late-swap document policy behavior</title>

<link rel="help" href="https://github.com/w3c/webappsec-feature-policy/blob/master/policies/font-display-late-swap.md">

<link rel="match" href="override-to-optional.tentative-ref.html">

<style>

</style>

<p>Tests if font-display is set to optional for each option except for when it is set to fallback</p>

<table id="container">

 <tr>

  <th>not-set</th>

  <th>auto</th>

  <th>block</th>

  <th>swap</th>

  <th>fallback</th>

  <th>optional</th>

 </tr>

</table>

<script>

const fontDisplayValues = ['', 'auto', 'block', 'swap', 'fallback', 'optional'];

const table = document.getElementById('container');

function makeFontFaceDeclaration(family, display) {

    url = '/fonts/Ahem.ttf?pipe=trickle(d1)'; // Before the swap period is over

    return '@font-face { font-family: ' + family + '; src: url("' + url + '"); font-display: ' + display + '; }';

window.onload = () => {

    let tr = document.createElement('tr');

    for (let display of fontDisplayValues) {

        const family = display + '-face';

        const rule = makeFontFaceDeclaration(family, display);

        document.styleSheets[0].insertRule(rule, 0);

        let td = document.createElement('td');

        td.textContent = 'a';

        td.style.fontFamily = family + ', Arial';

        tr.appendChild(td);

    table.appendChild(tr);

    const timeoutMilliSec = 1500; // After the font is loaded

    setTimeout(() => {

        document.documentElement.classList.remove("reftest-wait");

    }, timeoutMilliSec);

</script>

</html>