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This API is available on Firefox OS for internal applications only.


The delivery property represents the current state of the message delivery from the device perspective.


var state =;


A string which can be one of the following:

  • sending      : The message is in the process of being sent.
  • sent         : The message has been sent by the device.
  • not-download : The message has been received and is ready to be manually downloaded.
  • received     : The message has been received and is fully downloaded on the device.
  • error        : The sending process has encountered a problem and the message has not been sent.


This is a non-standard implementation, but it is discussed at W3C as part of the System Application Working Group.

Specification Status Comment
Messaging API Editor's Draft Editor Draft (WIP).

Browser compatibility

For obvious reasons, support is primarily expected on mobile browsers.

Supported in Firefox OS 1.0.1.

See also