tTimeout(() => reject({message: "no BroadcastChannel message"}), 3000);
      })

result, same first party: Error: Can&#39;t find variable: BroadcastChannel

result, different first party: Error: Can&#39;t find variable: BroadcastChannel

unsupported: true

passed: undefined

test failed: false</span>
</div></td></tr><tr><td><div class="tooltipParent">CacheStorage<span class="tooltipText">The Cache API is a content storage mechanism originally introduced to support ServiceWorkers. If the same Cache object i