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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
| commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
| tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /testing/web-platform/tests/largest-contentful-paint/observe-text.html | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip | |
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/largest-contentful-paint/observe-text.html')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/observe-text.html | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/observe-text.html b/testing/web-platform/tests/largest-contentful-paint/observe-text.html new file mode 100644 index 0000000000..5d0244b7e3 --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/observe-text.html @@ -0,0 +1,42 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<title>Largest Contentful Paint: observe text.</title> +<body> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<style> +p { + font-size: 12px; +} +</style> +<script> + async_test(function (t) { + assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); + let beforeRender; + const observer = new PerformanceObserver( + t.step_func_done(function(entryList) { + assert_equals(entryList.getEntries().length, 1); + const entry = entryList.getEntries()[0]; + assert_equals(entry.entryType, 'largest-contentful-paint'); + assert_greater_than_equal(entry.renderTime, beforeRender); + assert_greater_than_equal(performance.now(), entry.renderTime); + assert_approx_equals(entry.startTime, entry.renderTime, 0.001, + 'startTime should be equal to renderTime to the precision of 1 millisecond.'); + assert_equals(entry.duration, 0); + // Some lower bound: height of at least 12 px. + // Width of at least 100 px. + // TODO: find a good way to bound text width. + assert_greater_than_equal(entry.size, 1200); + assert_equals(entry.loadTime, 0); + assert_equals(entry.id, 'my_text'); + assert_equals(entry.url, ''); + assert_equals(entry.element, document.getElementById('my_text')); + }) + ); + observer.observe({type: 'largest-contentful-paint', buffered: true}); + beforeRender = performance.now(); + }, 'Text element is observable as a LargestContentfulPaint candidate.'); +</script> + +<p id='my_text'>This is important text! :)</p> +</body> |