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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /testing/web-platform/tests/largest-contentful-paint/first-paint-equals-lcp-text.html | |
| parent | Initial commit. (diff) | |
| download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/largest-contentful-paint/first-paint-equals-lcp-text.html')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/first-paint-equals-lcp-text.html | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/first-paint-equals-lcp-text.html b/testing/web-platform/tests/largest-contentful-paint/first-paint-equals-lcp-text.html new file mode 100644 index 0000000000..50bccd072e --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/first-paint-equals-lcp-text.html @@ -0,0 +1,49 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<title>LargestContentfulPaint compared with FirstPaint and FirstContentfulPaint on single text page.</title> +<body> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script> + setup({"hide_test_state": true}); + async_test(function (t) { + assert_implements(window.PerformancePaintTiming, "PerformancePaintTiming is not implemented"); + assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); + let firstPaintTime = 0; + let firstContentfulPaintTime = 0; + let largestContentfulPaintTime = 0; + const observer = new PerformanceObserver( + t.step_func(function(entryList) { + entryList.getEntries().forEach(entry => { + if (entry.name === 'first-paint') { + assert_equals(firstPaintTime, 0, 'Only one first-paint entry.'); + assert_equals(entry.entryType, 'paint'); + firstPaintTime = entry.startTime; + } else if (entry.name === 'first-contentful-paint') { + assert_equals(firstContentfulPaintTime, 0, 'Only one first-contentful-paint entry.'); + assert_equals(entry.entryType, 'paint'); + firstContentfulPaintTime = entry.startTime; + } else { + assert_equals(largestContentfulPaintTime, 0, 'Only one largest-contentful-paint entry.'); + assert_equals(entry.entryType, 'largest-contentful-paint'); + largestContentfulPaintTime = entry.renderTime; + } + // LCP fires necessarily after first-paint and first-contentful-paint. + if (largestContentfulPaintTime) { + assert_equals(firstContentfulPaintTime, largestContentfulPaintTime, 'FCP should equal LCP.'); + // In PaintTiming spec, first-paint isn't a hard requirement, browsers can support + // first-contentful-paint only. + if (firstPaintTime) { + assert_less_than_equal(firstPaintTime, firstContentfulPaintTime, 'FP should be less than or equal to FCP.'); + } + t.done(); + } + }); + }) + ); + observer.observe({type: 'largest-contentful-paint', buffered: true}); + observer.observe({type: 'paint', buffered: true}); + }, 'FCP and LCP are the same when there is a single text element in the page.'); +</script> +<p>Text</p> +</body> |