In other cases, sometimes you just need to check something but it's hidden in the responsive view and you can't see it.
2. No manipulation to the CSS.
3. Works on default and any custom style.
4. In supported browsers, not even a refresh is required.
5. Fileless, a lightweight js code is placed inline in the template.
6. Saves preferences in a cookie to quickly display the chosen version in the next time you open the site.
7. Works on admincp as well (XenForo 1.5, [rellect] Responsive AdminCP).