Perl version: v5.30.0
Example chars with Mark property:
COMBINING GRAVE ACCENT U+0300:     Nonspacing_Mark
COMBINING ENCLOSING KEYCAP U+20E3: Enclosing_Mark
Char at position 1 HAS Mark property.
Char at position 3 HAS Mark property.
Char at position 0 NOT Mark property.
Char at position 2 NOT Mark property.
Char at position 4 NOT Mark property.