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Service Worker: Non-nullable FetchEvent#clientId

Category

Service Worker

Type

New or changed feature

Status

Enabled by default (Chrome 66)

Intent stage

None

Summary

With this change FetchEvent#clientId will return an empty string instead of null when it isn't set, e.g., for a navigation request.

Standards & signals

• Specification: https://w3c.github.io/ServiceWorker/#fetchevent
• Firefox: Positive
• Safari: Positive
• Web developers: No signals
• Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=807818

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