<!-- BEGIN COPY / PASTE -->
        // Storing user preferences
        const userPreferences = {
            theme: "dark",
            fontSize: "16px"
        };
        localStorage.setItem("userPreferences", JSON.stringify(userPreferences));

        // Retrieving user preferences
        const storedPreferences = localStorage.getItem("userPreferences");
        if (storedPreferences) {
            const preferences = JSON.parse(storedPreferences);
            console.log(preferences.theme); // Output: "dark"
            console.log(preferences.fontSize); // Output: "16px"
        }
        <!-- END COPY / PASTE -->