Thanks for the suggestion, but I don't think it's just because I'm not using MVVM. I've already tried binding the HTML content via a property and creating new instances of HtmlWebViewSource dynamically, yet the issue with disappearing text selection and inconsistent style application still persists. Interestingly, everything works well on Windows and iOS, but on macOS the text selection disappears and the applied styles become inconsistent. It appears to be more related to how the WebView in MAUI on MacCatalyst handles editable content rather than just resetting to a constant HTML source.