File: event-source-timing.html

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="timeout" content="long">
<title>Resource Timing: EventSource timing behavior</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resource-timing/resources/observe-entry.js"></script>
</head>
</script>
<script>
    async_test(t => {
        const repetitions = 2;
        const url = new URL(`/eventsource/resources/message.py`, location.href);
        const eventSource = new EventSource(url);
        let messages = 0;
        t.add_cleanup(() => eventSource.close());
        eventSource.addEventListener('message', () => {
            ++messages;
        })

        new PerformanceObserver(() => {
            const entries = performance.getEntriesByName(url);
            assert_greater_than_equal(entries.length, messages - 1);
            if (entries.length === repetitions)
                t.done();
        }).observe({type: 'resource'});
    }, "ResourceTiming for EventSource should reflect number of re-connections to source");
</script>
</body>
</html>