On April 21st 2015 Google are changing their search and excluding non mobile friendly websites from their serch engine I have tested my site with their online test and X5 failed. What can you do to advise? 
Auteur : Michael H.
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There are some posts about the object, please check these;
https://helpcenter.websitex5.com/post/115492
https://helpcenter.websitex5.com/post/116552