Starting from Atom v1.13.0, the contents of atom-text-editor elements are no longer encapsulated within a shadow DOM boundary. This means you should stop using :host and ::shadow pseudo-selectors, and prepend all your syntax selectors with syntax--. To prevent breakage with existing style sheets, Atom will automatically upgrade the following selectors:
Automatic translation of selectors will be removed in a few release cycles to minimize startup time. Please, make sure to upgrade the above selectors as soon as possible.
arus2000
commented
2 years ago 
In
dropkick-dark-syntax\index.less:Starting from Atom v1.13.0, the contents of
atom-text-editorelements are no longer encapsulated within a shadow DOM boundary. This means you should stop using:hostand::shadowpseudo-selectors, and prepend all your syntax selectors withsyntax--. To prevent breakage with existing style sheets, Atom will automatically upgrade the following selectors:atom-text-editor .search-results .marker .region, atom-text-editor .search-results .marker .region=>atom-text-editor .search-results .syntax--marker .region, atom-text-editor .search-results .syntax--marker .regionatom-text-editor .search-results .marker.current-result .region, atom-text-editor .search-results .marker.current-result .region=>atom-text-editor .search-results .syntax--marker.current-result .region, atom-text-editor .search-results .syntax--marker.current-result .regionAutomatic translation of selectors will be removed in a few release cycles to minimize startup time. Please, make sure to upgrade the above selectors as soon as possible.