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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
| commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
| tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-subnode.html | |
| parent | Initial commit. (diff) | |
| download | thunderbird-upstream.tar.xz thunderbird-upstream.zip | |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-subnode.html')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-subnode.html | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-subnode.html b/testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-subnode.html new file mode 100644 index 0000000000..eca5f3590f --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-subnode.html @@ -0,0 +1,59 @@ +<!DOCTYPE html> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<style> + @font-face { + font-family: 'ADTestFaceSwapSubnode'; + src: url('/fonts/AD.woff?pipe=trickle(d0.5)'); + font-display: swap; + } + + .test { + font-family: 'ADTestFaceSwapSubnode'; + } + +</style> +<!-- + Web-font styled subnode text that gets resized during swap period should make + a LCP emission if the new size is larger than the existing LCP element size. +--> +<div class="test"> + <span>LCP: Web Font Styled Text Resize</span> +</div> +<script> + function LCPEntryList() { + return new Promise(resolve => { + let = lcpEntries = []; + new PerformanceObserver((entryList, observer) => { + lcpEntries = lcpEntries.concat(entryList.getEntries()); + if (lcpEntries.length == 2) { + resolve(lcpEntries); + observer.disconnect(); + } + }).observe({ type: 'largest-contentful-paint', buffered: true }); + }); + } + + promise_test(async t => { + await document.fonts.ready; + + // Verify web font is downloaded. + assert_own_property(window, 'PerformanceResourceTiming', "ResourceTiming not supported"); + let url = '/fonts/AD.woff?pipe=trickle(d0.5)'; + var absoluteURL = new URL(url, location.href).href; + assert_equals(performance.getEntriesByName(absoluteURL).length, 1, 'Web font\ + should be downloaded'); + + // Verify web font is available. + assert_true(document.fonts.check('16px ADTestFaceSwapSubnode'), 'Font should be the web font added'); + + let entryList = await LCPEntryList(); + + // Verify there are 2 LCP entries emitted. + 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.') + + // Verify the size of 2nd LCP entry is larger than that of the 1st one. + assert_greater_than(entryList[1].size, entryList[0].size, 'The size of 2nd LCP entry should be larger than that of the 1st one.'); + + }, "LCP should be updated if the web font styled text resizes to be larger during the swap period"); +</script> |