I've been working on a tauri app called Readerbear, which is a web browser designed for language learning. Had to do a bit of experimentation with multiple webviews, but in the end I had one webview for the browser, and 2 more for the sidebar and titlebar.
By pressing shift on any text in a webpage (Japanese currently), you can quickly lookup words. In addition, Anki flashcards can be made with one click. It also works with YouTube, and Netflix in the future.
I plan to add mobile support in the future as well.