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<!DOCTYPE html>
<head>
<title>Performance Paint Timing Test: FP followed by FCP</title>
</head>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="main"></div>
<div id="image"></div>
<script>
setup({"hide_test_state": true});
async_test(function (t) {
assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
const bufferedEntries = performance.getEntriesByType('paint');
assert_equals(bufferedEntries.length, 0, "No paint entries yet");
const div = document.createElement("div");
div.style.width = "100px";
div.style.height = "100px";
div.style.backgroundColor = "red";
div.style.color = "blue";
document.getElementById("main").appendChild(div);
function testPaintEntries() {
const bufferedEntries = performance.getEntriesByType('paint');
if (bufferedEntries.length < 1) {
t.step_timeout(function() {
testPaintEntries();
}, 20);
return;
}
t.step(function() {
assert_equals(bufferedEntries.length, 1, "FP only.");
assert_equals(bufferedEntries[0].entryType, "paint");
assert_equals(bufferedEntries[0].name, "first-paint");
});
const img = document.createElement("IMG");
img.src = "../resources/circles.png";
img.onload = function() {
function secondTestPaintEntries() {
const moreBufferedEntries = performance.getEntriesByType('paint');
if (moreBufferedEntries.length < 2) {
t.step_timeout(function() {
secondTestPaintEntries();
}, 20);
return;
}
t.step(function() {
assert_equals(moreBufferedEntries.length, 2, "FP and FCP.");
assert_equals(moreBufferedEntries[0].entryType, "paint");
assert_equals(moreBufferedEntries[0].name, "first-paint");
const fpEntriesGotByName =
performance.getEntriesByName('first-paint');
assert_equals(fpEntriesGotByName.length, 1);
assert_equals(moreBufferedEntries[0], fpEntriesGotByName[0]);
assert_equals(moreBufferedEntries[1].entryType, "paint");
assert_equals(moreBufferedEntries[1].name, "first-contentful-paint");
const fcpEntriesGotByName =
performance.getEntriesByName('first-contentful-paint');
assert_equals(fcpEntriesGotByName.length, 1);
assert_equals(moreBufferedEntries[1], fcpEntriesGotByName[0]);
t.done();
});
}
t.step(function() {
secondTestPaintEntries();
});
};
document.getElementById('image').appendChild(img);
}
t.step(function() {
testPaintEntries();
});
}, "First Paint triggered by non-contentful paint. Image load triggers First Contentful Paint.");
</script>
</body>
</html>
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