Interesting. It is using iframes behind the scenes. According to W3C it should limit the recursion depth to one, but it seems that you can get around that.
Relevant: https://www.bryanbraun.com/2021/03/24/infinitely-nested-ifra...
13 karma · joined October 13, 2020
Relevant: https://www.bryanbraun.com/2021/03/24/infinitely-nested-ifra...
Indeed. The fact that Flash is proprietary meant that all browsers had to use the same software (up to versioning and OS API implementations) to run SWF files. Now with HTML5, developers now have to deal with differences between different browsers (Chromium/Safari/Firefox are the most popular ones).
https://www.youtube.com/watch?v=X6NJkWbM1xk
By all means, find ways to fool-proof the architecture. But be prepared for scenarios where some destructive action happens to a production database.