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- This WPT test may be referenced by the following Test IDs:
- /long-animation-frame/conditional-tracing-buffer-limit.html - WPT Dashboard Interop Dashboard
<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Long Animation Frame Timing: conditional tracing buffer limit</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<body>
<h1>Long Animation Frame: Conditional Tracing Buffer Limit</h1>
<div id="log"></div>
<script>
setup(() =>
assert_implements(
"userTimingEntries" in PerformanceLongAnimationFrameTiming.prototype,
'conditional user timing for LoAF not implemented'));
const segment_duration = very_long_frame_duration / 2;
const kConditionalUserTimingBufferSize = 200;
promise_test(async t => {
const loaf_entry = await expect_long_frame(async (t, busy_wait) => {
const element = document.createElement("div");
document.body.appendChild(element);
t.add_cleanup(() => element.remove());
for (let i = 0; i < 50; i++) {
performance.markConditional("mark_repeat");
}
busy_wait(segment_duration);
for (let i = 0; i < 50; i++) {
performance.markConditional("mark1_" + i);
}
requestAnimationFrame(() => {
for (let i = 0; i < 50; i++) {
performance.markConditional("mark2_" + i);
}
busy_wait(segment_duration);
for (let i = 0; i < 50; i++) {
performance.markConditional("mark3_" + i);
}
});
new ResizeObserver(() => {
for (let i = 0; i < 50; i++) {
performance.markConditional("mark4_" + i);
}
busy_wait(segment_duration);
for (let i = 0; i < 50; i++) {
performance.markConditional("mark5_" + i);
}
}).observe(element);
}, t);
assert_not_equals(loaf_entry, "timeout");
const conditional_mark_entries = Array.from(loaf_entry.userTimingEntries)
.filter(entry => entry.entryType === "mark-conditional");
assert_equals(conditional_mark_entries.length, kConditionalUserTimingBufferSize);
}, 'conditional user timing entries are capped at ' + kConditionalUserTimingBufferSize);
</script>
</body>