WorkerPerformanceNow.html

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

<!DOCTYPE html>

<html>

<head>

<title>performance.now in dedicated workers</title>

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

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

</head>

<body>

<script>

async_test(function(t) {

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

  worker.onmessage = t.step_func_done(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");

});

  worker.postMessage('');

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

</script>

</body>

</html>