It's getting some improvements soon (at least from Chrome), currently requires renewing approval on every page load. https://bugs.chromium.org/p/chromium/issues/detail?id=101153...
It works well for my use case. If you want to see it in action: https://web.zquestclassic.com
The problem of course is not all browsers support. As a backup, I use either indexdb or local storage.