The new core Navigation module (the vertical sidebar that replaces the old horizontal toolbar) displays an icon in front of each top-level entry. For core entries, everything is taken care of. But as soon as a custom module adds its own…
Since Drupal 11.1, core ships with an Icon API: you declare an icon pack in a YAML file, and a Twig function renders the icons anywhere (templates, SDC, render arrays). On the back-office side, the contrib module UI Icons adds what core…