What are the best practices for ensuring that player points and game progress are accurately updated in a browser game, especially when players are offline?

One way to ensure that player points and game progress are accurately updated in a browser game, even when players are offline, is to store the data locally on the player's device using browser storage mechanisms such as localStorage or IndexedDB. This way, when the player goes offline, their progress can still be saved and updated locally, and then synced with the server once they come back online.

// Check if browser supports localStorage
if (typeof(Storage) !== "undefined") {
    // Store player points and game progress in localStorage
    localStorage.setItem('playerPoints', playerPoints);
    localStorage.setItem('gameProgress', gameProgress);
} else {
    // Fallback to server-side storage or other mechanisms
}