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subject property is a string representing the subject of the message (in many cases, its title).
var subject = instanceOfMozMmsMessage.subject;
This is a non-standard implementation, but it is discussed at W3C as part of the System Application Working Group.
|Messaging API||Editor's Draft||Editor Draft (WIP).|
For obvious reasons, support is primarily expected on mobile browsers.
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari|
|Basic support||No support||No support||No support||No support||No support|
|Feature||Android||Firefox Mobile (Gecko)||IE Mobile||Opera Mobile||Safari Mobile|
|Basic support||No support||12.0 (12.0) Moz||No support||No support||No support|