This article is in need of a technical review.
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
anniversary property represents the anniversary date of the contact (which can be different than its birthday date).
var anniversary = instanceOfMozContact.anniversary
Return a Date object.
|Contacts Manager API||Working Draft||First Working Draft (unstable)|
|vCard Format Specification||RFC||
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari|
|basic support||Not supported||Not supported||Not supported||Not supported||Not supported|
|Feature||Android||Chrome for Android||Firefox Mobile (Gecko)||IE Mobile||Opera Mobile||Safari Mobile|
|basic support||Not supported||Not supported||18.0 (non standard)||Not supported||Not supported||Not supported|
As the specification is unstable, the Gecko implementation is completely non-standard.