Bootstrap answer may require change.

[guynameddan]

https://www.frontendinterviewhandbook.com/css-questions#what-existing-css-frameworks-have-you-used-locally-or-in-production-how-would-you-changeimprove-them

First bullet point about Bootstrap may require a new answer since Bootstrap 5 has been released and does include a spinner button component https://getbootstrap.com/docs/5.0/components/spinners/

[hectoraldairah]

The answer is more about getting to the point that you used bootstrap before.
A lot of tech questions don't expect that you know the latest API changes on every release.