Which method allows you to add custom CSS and JavaScript to a Sitefinity site?

Adding custom CSS and JavaScript to a Sitefinity site can be efficiently managed through the backend resource manager or page templates. This method allows site administrators and developers to centralize and organize their styles and scripts, ensuring they are loaded properly across the site. By utilizing the resource manager, users can easily register, manage, and control the loading order of their assets, which is essential for maintaining site performance and avoiding conflicts between scripts or styles.

The backend resource manager integrates seamlessly with Sitefinity's structure, allowing for easy updates and consistency across various pages. This approach also provides options for setting conditions on when the scripts and styles will be included, which is beneficial for improving loading times and optimizing user experience.

Although writing custom themes from scratch is another method for adding custom CSS and JavaScript, it requires more initial effort and does not provide the same level of management capabilities as the built-in resource manager. External hosting services or browser developer tools may assist in testing or experimenting with scripts and styles but are not intended for permanent website integration within Sitefinity.