In particular, this seems to be the offending line:

https://github.com/craftpip/angular-confirm/blob/master/css/angular-confirm.less#L69

This means if you use an alert to display any kind of important info, e.g. an error message, users won't be able to copy-paste that text, for example to report the problem, which is not helpful.

I know that I can override this with my own CSS, but libraries should not default to disabling built-in browser behaviour. Thanks!