Can a javascript dropdown in-email like G+ be implemented by anyone, or only Google? -

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noticed today great trinket google: in notification emails upon new g+ followers, recipient can add circle directly dropdown in email. (see below).

the html page shows related div has been attached end of body, suggesting div di not 'ship with' email , displayed via in-email javascript.

is kind of interactivity available engineer / product developer? google gets because control gmail services?

enter image description here

the google+ integration see specific gmail:

http://gmailblog.blogspot.com/2012/05/better-google-notification-experience.html

in general not able run javascript in gmail or other webmail providers due security concerns. there ways of making more interactive emails, platform specific. example:


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