event-source-timing.html

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This WPT test may be referenced by the following Test IDs:
- /resource-timing/event-source-timing.html - WPT Dashboard Interop Dashboard

<!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>