[Ideas] IsMobileBrowser()

Hi
With the function IsMobileBrowser() you can ajust all content for mobile browser, showing it only if working in mobile browser.
Unfortnetly, this function doen's work in preview mode for smartphone, and we always need to access an "real" smartphone to preview it. 
It is a good ideia to hsow that function working when in desktop we put the preview mode in smartphone.

Best Regards