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 WidgetClass:tag2 { fg: "green"; }

While it is not specified which tagged definition takes precedence, and
therefore whether it shall be blue or green, it is specified that both of the
tagged definitions take precedence over the untagged definition, so the colour
will not be red.

=head1 SUBCLASSING

If a Widget class is subclassed and the subclass does not declare
C<use Tickit::Style> again, the subclass will be transparent from the point of
view of style. Any style applied to the base class will apply equally to the
subclass, and the name of the subclass does not take part in style decisions.

If the subclass does C<use Tickit::Style> again then the new subclass has a
distinct widget type for style purposes. It can optionally copy the style
information from its base class, but thereafter the stored information is
distinct, and changes in the base class (such as loading style files) will not
affect it.

To copy the style information from the base, apply the C<-copy> keyword: