Google plus sharing button does'nt display snippet infroamtions in a popup
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What steps will reproduce the problem?
1.Create a Javascript popup using window.open() function
2.Generate HTML code(using PHP) in the popup
3.HTML generated have snippet informations

When I click on the google +1 button I only see the title of the page and the first paragraph identified by "<p>" tags.
I have typed all is mentionned in the documentation to display snippet.

You can find my code running at 
https://www.users.prplk.com/users/modulesNav/genererLien.php

This code is working well in this link(it is a copy/paste of what I have in my popup). But I don't understand why it doesn't work in my popup.

I hope someone have a solution to my problem.

Regards.