Which of the following can be a potential pitfall when using Portals?

A potential pitfall when using Portals is the loss of event delegation. Events that bubble up from the portal content may not behave as expected, especially if you rely on event delegation. Styling the portal content can be achieved, but it may require some adjustments. Improved accessibility is generally a benefit of using Portals, and compatibility issues with older browsers can be a concern but not a common pitfall.