[Mapcss] Example for "set"

[Bjoern Hassler]

Hello all,

Would somebody be able to give an example, ideally in overpass-turbo, for
the following:

 Declarations may also be used to set the value of certain tags on an
object:
 { set tag=value; }   /* set a tag */
 { set tag; }         /* set a tag to 'yes' */

and

 You can set tags beginning with a full-stop to simulate classes:
 { set .minor_road; }
 You can then use the .minor_road test (as above) in the selector:
 way.minor_road

It's not really clear to me how these work. See also here
https://wiki.openstreetmap.org/wiki/Talk:MapCSS/0.2#Example_for_.22set.22
if you prefer to answer on the wiki!

Many thanks!
Bjoern
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