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Diffstat (limited to '')
-rw-r--r-- | testing/web-platform/tests/paint-timing/with-first-paint/first-contentful-bg-image.html | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/testing/web-platform/tests/paint-timing/with-first-paint/first-contentful-bg-image.html b/testing/web-platform/tests/paint-timing/with-first-paint/first-contentful-bg-image.html new file mode 100644 index 0000000000..40eaa635bb --- /dev/null +++ b/testing/web-platform/tests/paint-timing/with-first-paint/first-contentful-bg-image.html @@ -0,0 +1,43 @@ +<!DOCTYPE html> +<head> +<title>Performance Paint Timing Test: FCP due to background image</title> +</head> +<body> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<div id="main"></div> +</body> + +<footer> +<script> +setup({"hide_test_state": true}); +async_test(function (t) { + assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported."); + const body = document.getElementsByTagName('body')[0]; + body.style.backgroundImage = 'url(../resources/circles.png)'; + window.onload = function() { + function testPaintEntries() { + const bufferedEntries = performance.getEntriesByType('paint'); + if (bufferedEntries.length < 2) { + t.step_timeout(function() { + testPaintEntries(); + }, 20); + return; + } + t.step(function() { + assert_equals(bufferedEntries.length, 2, "There should be two paint timing instances."); + assert_equals(bufferedEntries[0].entryType, "paint"); + assert_equals(bufferedEntries[0].name, "first-paint"); + assert_equals(bufferedEntries[1].entryType, "paint"); + assert_equals(bufferedEntries[1].name, "first-contentful-paint"); + t.done(); + }); + } + t.step(function() { + testPaintEntries(); + }); + }; +}, "First contentful paint fires due to background image render."); +</script> +<footer> +</html> |