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+<!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>