Need help in the process of creating your own WordPress theme?
Here are some restrictions to keep in mind:
box
containers.attr
parameter from Post Options first level box
containers, is not used.
Because boxes are added with add_meta_box() which has no parameter for specifying attributes.Note
There are no restrictions for what options are contained in the options
parameter. It’s possible to create multi level options: boxes inside boxes, tabs inside boxes, tabs inside tabs, and so on.