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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
| commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
| tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-after-interaction.html | |
| parent | Initial commit. (diff) | |
| download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip | |
Adding upstream version 110.0.1.upstream/110.0.1upstream
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-after-interaction.html')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-after-interaction.html | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-after-interaction.html b/testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-after-interaction.html new file mode 100644 index 0000000000..3ba02bab5a --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/web-font-styled-text-resize-swap-after-interaction.html @@ -0,0 +1,90 @@ +<!DOCTYPE html> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src=/resources/testdriver.js></script> +<script src=/resources/testdriver-actions.js></script> +<script src=/resources/testdriver-vendor.js></script> +<style></style> +<!-- + Web-font styled text that gets resized after an interaction stops LCP + observation should not make a new LCP emission. +--> +<textarea id='input'></textarea> +<div class="test">LCP: Web Font Styled Text Resize</div> +<script> + function addCSSRules() { + styleSheet = document.styleSheets[0]; + fontRuleSet = "@font-face {\ + font-family: 'ADTestFaceInteraction';\ + src: url('/fonts/AD.woff');\ + font-display: swap;\ + }"; + fontAtRule = ".test {\ + font-family: 'ADTestFaceInteraction';\ + } "; + styleSheet.insertRule(fontRuleSet); + styleSheet.insertRule(fontAtRule); + } + + function LCPEntryList(t) { + return new Promise(resolve => { + let = lcpEntries = []; + new PerformanceObserver((entryList, observer) => { + lcpEntries = lcpEntries.concat(entryList.getEntries()); + if (lcpEntries) { + // Adding timeout to wait a bit more so that if there are more than + // expected LCP entries emitted, they can be observed. + t.step_timeout(() => { + resolve(lcpEntries); + observer.disconnect(); + }, 200); + } + }).observe({ type: 'largest-contentful-paint', buffered: true }); + }); + } + + promise_test(async t => { + await document.fonts.ready; + let system_font_size = document.getElementsByClassName('test')[0].offsetHeight; + + // Verify an LCP entry is emitted. + let entryList = await LCPEntryList(t); + assert_equals(entryList.length, 1, 'Text with system font should make a LCP emission.'); + + let lcpEntryBeforeInteraction = entryList[0]; + + // Add event listener so that CSS rule would be added after there's an + // input. + let inputElement = document.getElementById('input'); + inputElement.addEventListener('keydown', addCSSRules); + + // Send key as input. + await test_driver.send_keys(inputElement, 'k'); + + // Wait for web font to load. + await document.fonts.ready; + + // Verify web font is downloaded. + assert_own_property(window, 'PerformanceResourceTiming', "ResourceTiming not supported"); + let url = '/fonts/AD.woff'; + 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 ADTestFaceInteraction'), 'Font should be the web font added'); + + // Verify web font is applied. + let web_font_size = document.getElementsByClassName('test')[0].offsetHeight; + assert_not_equals(web_font_size, system_font_size, 'Web font swap should happen'); + + // Assert there is only 1 LCP entry, which verifies the added web font does + // not make a new LCP entry after an input. + entryList = await LCPEntryList(t); + assert_equals(entryList.length, 1, 'Text with system font should not make a LCP emission.'); + + // Verify the LCP entry is the same one emitted before interaction by + // asserting the size is the same. + assert_equals(lcpEntryBeforeInteraction.size, entryList[0].size, 'There should be only 1 LCP entry emitted.'); + + }, "LCP should be not updated if the web font styled text resize occurs after an interaction happens"); +</script> |