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PushManager.supportedContentEncodings updates #36962

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PushManager.supportedContentEncodings updates #36962

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15 changes: 12 additions & 3 deletions files/en-us/web/api/pushmanager/supportedcontentencodings_static/index.md
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Expand Up @@ -8,14 +8,23 @@ browser-compat: api.PushManager.supportedContentEncodings_static

{{APIRef("Push API")}}{{SecureContext_Header}}{{AvailableInWorkers}}

The **`supportedContentEncodings`** read-only static property of the
{{domxref("PushManager")}} interface returns an array of supported content codings that
can be used to encrypt the payload of a push message.
The **`supportedContentEncodings`** read-only static property of the {{domxref("PushManager")}} interface returns an array of supported content codings that can be used to encrypt the payload of a push message.

<!-- The content coding is indicated using the {{httpheader("Content-Encoding")}} HTTP header field when requesting the sending of a push message from the push service. -->
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This is from the spec. But I don't understand what actor does this, when, and how. So asking.


User agents must support the `aes128gcm` content coding defined in {{rfc("8291")}}, and may also support content codings defined from previous versions of the specification.

Note that the returned array is frozen, and may not be modified by the recipient.

## Value

An array of strings.

## Exceptions

- `TypeError`
- This is thrown when attempting to set a value in the returned array.

## Specifications

{{Specifications}}
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