57 lines
2.1 KiB
HTML
57 lines
2.1 KiB
HTML
<!DOCTYPE html>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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@font-face {
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font-family: 'TestFaceSmaller';
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src: url('/fonts/CSSTest/csstest-basic-regular.ttf?pipe=trickle(d0.5)');
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size-adjust: 30%;
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font-display: swap;
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}
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.test {
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font-family: 'TestFaceSmaller';
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}
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</style>
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<!--
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Web-font styled text that gets resized during swap period should not make a
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LCP emission if the new size is smaller than the current LCP element size.
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-->
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<div class="test">LCP: Web Font Styled Text Resize</div>
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<script>
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function LCPEntryList(t) {
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return new Promise(resolve => {
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let = lcpEntries = [];
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new PerformanceObserver((entryList, observer) => {
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lcpEntries = lcpEntries.concat(entryList.getEntries());
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if (lcpEntries) {
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// Adding timeout to wait a bit more so that if there are more than
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// expected LCP entries emitted, they can be observed.
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t.step_timeout(() => {
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resolve(lcpEntries);
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observer.disconnect();
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}, 200);
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}
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}).observe({ type: 'largest-contentful-paint', buffered: true });
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});
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}
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promise_test(async t => {
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await document.fonts.ready;
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// Verify web font is loaded.
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assert_own_property(window, 'PerformanceResourceTiming', "ResourceTiming not supported");
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let url = '/fonts/CSSTest/csstest-basic-regular.ttf?pipe=trickle(d0.5)';
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var absoluteURL = new URL(url, location.href).href;
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assert_equals(performance.getEntriesByName(absoluteURL).length, 1, 'Web font should be downloaded');
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// Verify web font is available.
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assert_true(document.fonts.check('10px TestFaceSmaller'), 'Font should be the web font added');
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// Verify there is only one LCP entry.
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let entryList = await LCPEntryList(t);
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assert_equals(entryList.length, 1, 'Web font styled text resize that occurs during swap period but is smaller should not make a new LCP emission.')
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}, "LCP should be not updated if the web font styled text resizes to be smaller during the swap period");
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</script>
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