Template:Vertical text/doc

Usage
where text (as unnamed parameter ) is the string to be displayed vertically.

An optional named parameter  may be used to specify additional CSS style attributes (e.g. font-size, color, etc).

Note: These style attributes should be terminated with a semicolon and not enclosed in quotes (see examples below).

If you want to display vertical text in a link, you need to write it as, not as. This is a technical restriction (T200704) of TemplateStyles extension.