59 lines
2.1 KiB
HTML
59 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: 'ADTestFaceSwapSubnode';
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src: url('/fonts/AD.woff?pipe=trickle(d0.5)');
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font-display: swap;
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}
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.test {
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font-family: 'ADTestFaceSwapSubnode';
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}
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</style>
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<!--
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Web-font styled subnode text that gets resized during swap period should make
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a LCP emission if the new size is larger than the existing LCP element size.
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-->
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<div class="test">
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<span>LCP: Web Font Styled Text Resize</span>
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</div>
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<script>
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function LCPEntryList() {
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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.length == 2) {
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resolve(lcpEntries);
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observer.disconnect();
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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 downloaded.
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assert_own_property(window, 'PerformanceResourceTiming', "ResourceTiming not supported");
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let url = '/fonts/AD.woff?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\
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should be downloaded');
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// Verify web font is available.
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assert_true(document.fonts.check('16px ADTestFaceSwapSubnode'), 'Font should be the web font added');
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let entryList = await LCPEntryList();
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// Verify there are 2 LCP entries emitted.
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assert_equals(entryList.length, 2, 'There should be 2 LCP entries. The 1st one corresponds to the system font and the 2nd the web font.')
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// Verify the size of 2nd LCP entry is larger than that of the 1st one.
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assert_greater_than(entryList[1].size, entryList[0].size, 'The size of 2nd LCP entry should be larger than that of the 1st one.');
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}, "LCP should be updated if the web font styled text resizes to be larger during the swap period");
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</script>
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