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<!DOCTYPE html>
<head>
<title>Performance Paint Timing Test</title>
</head>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="main"></div>
<script>
setup({"hide_test_state": true});
async_test(function(t) {
assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
t.step(function() {
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";
div.innerHTML = "test"
document.getElementById("main").appendChild(div);
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, "FP and FCP.");
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();
});
}, "Basic test to check existence of FP and FCP.");
</script>
</body>
</html>
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