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    This article is in need of a technical review.

    This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.

    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.
    • received     : The message has been received 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.

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support Not supported Not supported Not supported Not supported Not supported
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported 12.0 (12.0) Moz Not supported Not supported Not supported

    See also

    Document Tags and Contributors

    Contributors to this page: fscholz, Jeremie, kscarfone, MHasan
    Last updated by: fscholz,