font-display.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /css/css-fonts/font-display/font-display.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html class="reftest-wait">

<title>Test for font-display @font-face descriptor</title>

<meta name="timeout" content="long">

<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-display-desc">

<link rel="match" href="font-display-ref.html">

<link rel="preload" href="/fonts/Ahem.ttf?pipe=trickle(d0)" as="font" crossorigin>

<style>

.hidden { display: none; }

</style>

<p>Tests how text with a font that takes <i>delay</i> seconds to load look like after <i>T</i> seconds from load start.</p>

<table id="container">

 <tr>

  <th>T[sec]</th>

  <th>delay[sec]</th>

  <th>block</th>

  <th>swap</th>

  <th>fallback</th>

  <th>optional</th>

 </tr>

</table>

<script>

var fontDisplayValues = ['block', 'swap', 'fallback', 'optional'];

var configs = [{time: 0, delay: 1000},

               {time: 1000, delay: 0},

               {time: 1000, delay: 500},

               {time: 1000, delay: 3000},

               {time: 5000, delay: 2000},

               {time: 5000, delay: 4000},

               {time: 5000, delay: 8000}];

function makeFontFaceDeclaration(family, config, display) {

    url = '/fonts/Ahem.ttf?pipe=trickle(d' + config.delay / 1000 + ')';

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

var maxTime = Math.max.apply(null, configs.map((config) => config.time));

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

window.onload = function() {

    for (var config, i = 0; config = configs[i]; i++) {

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

        tr.classList.add('hidden');

        var td1 = document.createElement('td');

        td1.textContent = config.time / 1000;

        tr.appendChild(td1);

        var td2 = document.createElement('td');

        td2.textContent = config.delay / 1000;

        tr.appendChild(td2);

        for (var display, j = 0; display = fontDisplayValues[j]; j++) {

            var family = [display, config.time, config.delay].join('-');

            var rule = makeFontFaceDeclaration(family, config, display);

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

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

            td.textContent = 'a';

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

            tr.appendChild(td);

        table.appendChild(tr);

        if (config.time == 0) {

            setTimeout((function(tr){

                tr.classList.remove('hidden');

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

            }).bind(null, tr), maxTime);

        } else {

            setTimeout((function(tr){tr.classList.remove('hidden')}).bind(null, tr), maxTime - config.time);

</script>

</html>