Web APIs

In addition to its own API interfaces, the extension runtime supports a limited set of APIs from the Web APIs set of living standards.

Encoding API

The Encoding API is available to allow for easy encoding and decoding of data to and from specific text encodings.

The following interfaces are available:

• TextDecoder
• TextEncoder

Fetch API

The Fetch API is available to allow for dispatching asynchronous HTTP(s) requests and receiving responses using Promise objects.

The following interfaces are available:

• fetch()
• Body
• Headers
• Request
• Response

Streams API

The Streams API is available to support readable and writable data streams that communicate both over the network (used in the Fetch API) as well as between processes (used in the Process API).

The following interfaces are available:

• ByteLengthQueuingStrategy
• CountQueuingStrategy
• ReadableStream
• ReadableStreamDefaultController
• ReadableStreamDefaultReader

• WritableStream
• WritableStreamDefaultController
• WritableStreamDefaultWriter

WindowOrWorkerGlobalScope

The global object of the extension runtime implements some of the WindowOrWorkerGlobalScope mixin from the HTML living spec.

The following interfaces are available:

• atob() / btoa()
• setTimeout() / clearTimeout()
• setInterval() / clearInterval()