Push API : Allow passing a base64url-encoded value to `applicationServerKey`

Category: Miscellaneous
Type: New or changed feature
Status: Enabled by default (Chrome 76)
Intent stage: None

Summary

The applicationServerKey option is used by the user agent when establishing a push subscription with a push service. This is the key that the application server will use to authenticate itself when sending push messages to this push subscription. Currently, applicationServerKey only supports BufferSource in Chrome. After this change, it can also accept a base64url encoded value.

Standards & signals

Specification: https://w3c.github.io/push-api/#idl-def-pushsubscriptionoptionsinit
Firefox: Shipped/Shipping
Safari: No signal
Web developers: Positive
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=802280

Docs: https://developer.mozilla.org/en-US/docs/Web/API/PushManager/subscribe

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