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