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Diffstat (limited to '')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/loadTime-after-appendChild.html | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/loadTime-after-appendChild.html b/testing/web-platform/tests/largest-contentful-paint/loadTime-after-appendChild.html new file mode 100644 index 0000000000..52d8f0663b --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/loadTime-after-appendChild.html @@ -0,0 +1,34 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<title>Largest Contentful Paint: delayed appended image.</title> +<body> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/largest-contentful-paint-helpers.js"></script> +<script> + setup({"hide_test_state": true}); + async_test(function (t) { + assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); + let beforeLoad; + const observer = new PerformanceObserver( + t.step_func_done(entryList => { + assert_equals(entryList.getEntries().length, 1); + const entry = entryList.getEntries()[0]; + const url = window.location.origin + '/images/black-rectangle.png'; + // blue.png is 100 by 50. + const size = 100 * 50; + checkImage(entry, url, 'image_id', size, beforeLoad); + }) + ); + observer.observe({type: 'largest-contentful-paint', buffered: true}); + const img = document.createElement('img'); + img.src = '/images/black-rectangle.png'; + img.id = 'image_id'; + t.step_timeout(() => { + beforeLoad = performance.now(); + document.getElementById('image_div').appendChild(img); + }, 200) + }, 'Image loadTime occurs after appendChild is called.'); +</script> +<div id='image_div'></div> +</body> |