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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-display-timeline">
<script nonce="abc" src="/resources/testharness.js"></script>
<script nonce="abc" src="/resources/testharnessreport.js"></script>
<style>
@font-face {
font-family: 'TestFace';
src: url('/fonts/Ahem.ttf?pipe=trickle(d0.5)'),
url('/fonts/Ahem.ttf?fallback-src');
font-display: optional;
}
@font-face {
font-family: 'FallbackFace';
src: url('/fonts/Ahem.ttf?fallback-face');
}
.test {
font-family: 'TestFace','FallbackFace';
}
</style>
<div class="test">hello</div>
<script>
function numberOfDownloads(url) {
assert_true(!!window.PerformanceResourceTiming, "ResourceTiming not supported");
var absoluteURL = new URL(url, location.href).href;
return performance.getEntriesByName(absoluteURL).length;
}
promise_test(function() {
return document.fonts.ready.then(function() {
assert_equals(numberOfDownloads('/fonts/Ahem.ttf?pipe=trickle(d0.5)'), 1, 'first source should be loaded');
assert_equals(numberOfDownloads('/fonts/Ahem.ttf?fallback-src'), 0, 'fallback source should not be loaded');
assert_equals(numberOfDownloads('/fonts/Ahem.ttf?fallback-face'), 1, 'fallback font face should be loaded');
});
}, "Fallback for font failure period");
</script>
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