• https://developer.mozilla.org/en-US/docs/Web/API/Navigator/Online_and_offline_events (Novice)
• https://developer.mozilla.org/en-US/docs/Web/API/Network_Information_API (Novice)
• https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API (Novice)
• https://developer.mozilla.org/en-US/docs/Web/API/Cache (Novice)
• https://developer.mozilla.org/en-US/docs/Web/API/Web_Periodic_Background_Synchronization_API (Novice)
• https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API (Intermediate)
• https://developer.mozilla.org/en-US/docs/Web/API/Worklet (Intermediate)
• https://developer.mozilla.org/en-US/docs/Web/API/Background_Tasks_API (Intermediate)
• https://developer.mozilla.org/en-US/docs/Web/Web_Components (Intermediate)

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