Allow extensions to add custom css

server.py

@@ -142,6 +142,11 @@ class PromptServer():
                     name) + "/" + os.path.relpath(f, dir).replace("\\", "/"), files)))
 
             return web.json_response(extensions)
+        
+        @routes.get("/extensions/styles")
+        async def get_extensions_styles(request):
+            files = glob.glob(os.path.join(self.web_root, 'extensions/**/*.css'), recursive=True)
+            return web.json_response(list(map(lambda f: "/" + os.path.relpath(f, self.web_root).replace("\\", "/"), files)))
 
         def get_dir_by_type(dir_type):
             if dir_type is None:

web/scripts/api.js

@@ -163,6 +163,15 @@ class ComfyApi extends EventTarget {
 		return await resp.json();
 	}
 
+	/**
+	 * Gets a list of extension's CSS style urls
+	 * @returns An array of CSS urls to include
+	 */
+	async getExtensionsStyles() {
+		const resp = await this.fetchApi("/extensions/styles", { cache: "no-store" });
+		return await resp.json();
+	}
+
 	/**
 	 * Gets a list of embedding names
 	 * @returns An array of script urls to import

web/scripts/app.js

@@ -1130,6 +1130,15 @@ export class ComfyApp {
 	    });
 	
 	    await Promise.all(extensionPromises);
+
+		const styles = await api.getExtensionsStyles();
+		function loadCSS(url) {
+			var link = document.createElement('link');
+			link.rel = 'stylesheet';
+			link.href = url;
+			document.head.appendChild(link);
+		}
+		styles.forEach(loadCSS);
 	}
 
 	/**