How to add a Microdata ?

[JOduMonT]

Hi there;

I tried to add a markup and...

the modification appear through the page editor

but it don't appear when I look into the source code of the rendered page. (frontend)

I must admit; this is one of my first steps with editing a plugin and grav

Now I know we could ask for more Microdata type, but I would very appreciate if someone could tell me where or how to correct my code to make it works so, in long term; I'll able to contribute to this project and grav.

this is one of my try