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added a technical description of the Interactive Family Tree addon
A web page will open with your family tree. You can click on people to change the focus of the tree.
==Technical details==
One of the features of this addon is that '''the Interactive Family Tree addon does not send any data out of your computer.'''
This is something that is not obvious because what you see in the browser is a web application. Here is a technical description of how the addon works.
On the Gramps side, the addon exports a GEDCOM file from your database and runs a HTTP server inside Gramps that can send out the GEDCOM file.
Then, the addon opens your browser pointing to a web application hosted on GitHub pages. The web application is loaded in your browser. It is a “single page application” that once it is loaded it does not require an Internet connection to work (this is why you can open it from the browser’s cache even with WiFi turned off). After the web application is loaded it loads the GEDCOM file from the HTTP server in Gramps. The data is only loaded into the browser’s memory and does not leave your computer. It is processed by JavaScript code to produce a visualization of the data.
==Issues==
