Deprecated OpenStreetMap Tile URLs
If you have projects that still use OpenStreetMap map tiles with the deprecated URL schema i.e., {a,b,c}.tiles.openstreetmap.org, do upgrade to the newer schema.
tile.openstreetmap.org supports HTTP/2 and HTTP/3 which no longer require the old (a|b|c) aliases to increase browser connection concurrency. Using a single URL improves performance and ability to cache.
It will make your app faster and lowers the burden on maintainers.