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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/browsers/browsing-the-web/back-forward-cache/eligibility/shared-worker-active-client.window.html - WPT Dashboard Interop Dashboard
// META: title=BFCache is allowed for a page with SharedWorker if another client is active.
// META: script=/common/utils.js
// META: script=/common/dispatcher/dispatcher.js
// META: script=/html/browsers/browsing-the-web/back-forward-cache/resources/helper.sub.js
// META: timeout=long
'use strict';
// Check whether the page is BFCached when there is another active client for
// the shared worker.
runBfcacheTest(
{
funcBeforeNavigation: async () => {
globalThis.worker = new SharedWorker('../resources/echo-worker.js');
await WorkerHelper.pingWorker(globalThis.worker);
// Create another client in a new window.
const workerUrl =
new URL('../resources/echo-worker.js', window.location.href).href;
const helperPageContent = `
<script>
new SharedWorker('${workerUrl}');
const bc = new BroadcastChannel('worker_ready');
bc.postMessage('ready');
bc.close();
</script>
`;
const blob = new Blob([helperPageContent], {type: 'text/html'});
window.open(URL.createObjectURL(blob), '_blank', 'noopener');
await new Promise(resolve => {
const bc = new BroadcastChannel('worker_ready');
bc.onmessage = e => {
if (e.data === 'ready') {
bc.close();
resolve();
}
};
});
},
funcAfterAssertion: async (pageA) => {
// Confirm that the worker is still there.
assert_equals(
await pageA.execute_script(
() => WorkerHelper.pingWorker(globalThis.worker)),
'PASS',
'SharedWorker should still work after restored from BFCache');
}
},
'Eligibility: shared workers with another active client in a separate window');