I'm modifying the bones theme (https://github.com/eddiemachado/bones), but when I run it through Theme-Check, I get the following warning -
WARNING: The flexible-width and fixed-width tags changed to fluid-layout and fixed-layout tags in WordPress 3.8. Additionally, the responsive-layout tag was added. Please change to using one of the new tags.
Okay, is this referring to CSS tags in general, or new WordPress tags? If the latter, where can I find more information? I tried searching and came up short.