CSP for Leaflet Maps: Common Mistakes and Fixes
Leaflet looks simple until you lock down your site with Content Security Policy. Then the map goes blank, markers disappear, plugin styles break, and you end up staring at DevTools wondering why a harmless map library suddenly needs half the internet. I’ve hit this enough times that I treat Leaflet as a CSP integration task, not just a UI widget. The good news: most failures come from a handful of repeat mistakes. ...