Tauri also has their own experimental Servo engine: https://v2.tauri.app/blog/tauri-verso-integration/ So it's not necessarily a wrapper over system webview.

Verso just got archived :(

    As the project progressed, multiple significant revisions to Servo were released, and the Verso browser was unable to keep pace with these updates due to limited manpower and funding. Therefore, we will be archiving the repository for now and look forward to a future opportunity to revitalize the project and continue contributing to the Servo ecosystem. [0]