Extra tag names to treat as styling containers, beyond the built-in b/i/span/br/img.
A run inside one carries its name in MarkupSpan.tag, so a renderer can look its style up
(Pixi's tagStyles, for example) while the parser stays renderer-neutral.
OptionalReadonlyvariables
variables?:Readonly<Record<string,string>>
What a $name in the text becomes. A name that is not here is left as it was written, which is
what Wesnoth does with an unset variable - dropping it would silently eat a player's name.
Extra tag names to treat as styling containers, beyond the built-in
b/i/span/br/img. A run inside one carries its name inMarkupSpan.tag, so a renderer can look its style up (Pixi'stagStyles, for example) while the parser stays renderer-neutral.