SharedWorkerPerformanceNow.html

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This WPT test may be referenced by the following Test IDs:
- /workers/SharedWorkerPerformanceNow.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<title>window.performance.now in shared workers</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

</head>

<body>

<script>

async_test(function(t) {

    const worker = new SharedWorker('support/WorkerSendingPerformanceNow.js');

    worker.port.onmessage = t.step_func(event => {

        const results = event.data;

        assert_equals(results.length, 4);

        assert_equals(results[0], 'undefined',

          'workerStart not defined on the Worker object');

        assert_equals(results[1], 'object', 'self.performance is defined');

        assert_equals(results[2], 'function', 'self.performance.now is defined');

        assert_greater_than(results[3], 0, 'Time in the worker should be positive');

        assert_greater_than(window.performance.now(), results[3], 'Time in the worker should be before the current time in the main document');

        setupIframe();

});

    window.iframeStartTime = 0;

    window.test_iframe = function(event) {

        const workerTime = event.data[3];

        assert_greater_than(workerTime, window.iframeStartTime,

            'Time since origin time should be greater in the shared worker than the iframe');

        t.done();

    function setupIframe() {

        const iframe = document.createElement('iframe');

        document.body.appendChild(iframe);

        const script = iframe.contentWindow.document.createElement('script');

        script.innerHTML =

            'window.top.iframeStartTime = window.performance.now();' +

            'const worker = new SharedWorker("support/WorkerSendingPerformanceNow.js");' +

            'worker.port.onmessage = function(event) {' +

            '    window.top.test_iframe(event);' +

            '};' +

            'worker.port.postMessage("");';

        iframe.contentWindow.document.body.appendChild(script);

    worker.port.postMessage('');

}, 'performance.now() exists in shared workers and reports reasonable times');

</script>

</body>

</html>