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Diffstat (limited to '')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/placeholder-image.html | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/placeholder-image.html b/testing/web-platform/tests/largest-contentful-paint/placeholder-image.html new file mode 100644 index 0000000000..6a2ce5c7c6 --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/placeholder-image.html @@ -0,0 +1,31 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<title>Largest Contentful Paint: src change triggers new entry.</title> +<body> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/largest-contentful-paint-helpers.js"></script> +<img src='/images/green-1x1.png' id='image_id' width="133" height="106"/> +<script> + async_test(function (t) { + assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); + let beforeLoad = performance.now(); + document.getElementById('image_id').src = '/images/blue.png'; + const url = window.location.origin + '/images/blue.png'; + const observer = new PerformanceObserver( + t.step_func(function(entryList) { + let entries = entryList.getEntries().filter(e => e.url === url); + if (entries.length === 0) + return; + assert_equals(entries.length, 1); + const entry = entries[0]; + // blue.png is 133 by 106. + const size = 133 * 106; + checkImage(entry, url, 'image_id', size, beforeLoad); + t.done(); + }) + ); + observer.observe({type: 'largest-contentful-paint', buffered: true}); + }, 'Largest Contentful Paint: changing src causes a new entry to be dispatched.'); +</script> +</body> |