This recent article from The New Stack talks about how Edge v122 started a move away from React and JavaScript in the user interface and toward Web Components and HTML-first:
We build a lot of the browser out of web “stuff” these days (think bookmarks, history, downloads, settings, new-tab-page, etc.), and moving away from React to a modern Web Components + HTML-first architecture has had a huge benefit for users, particularly folks on low-end hardware.
While this is strictly talking about how Edge draws its own user interface, I believe this is part of a general trend with Web Components on one end of the continuum and Gemini on the other.