Allows to style pseudo elements that are nested inside other pseudo elements. So far, support is defined for: ::before::marker ::after::marker With ::column::scroll-marker being supported in the future.
Nested pseudo elements styling allows to style ::before::marker and ::after::marker pseudo elements and wil be essential to style ::column::scroll-marker pseudo elements for the carousel project (https://github.com/flackr/carousel/tree/main/fragmentation).