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<!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>
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