I now see that we're not really talking about alerts in the 'alert()' sense, but rather about the popups - which are not native widgets (which are better off no

I now see that we're not really talking about alerts in the 'alert()' sense, but rather about the popups - which are not native widgets (which are better off non-modifiable, in my opinion). My bad. Do you know of any good reading material concerning these form validation popups? From reading on MDN [0], they seem to be browser specific - like the Chrome connection tab [1] - but somewhat customisable via JS. [0]: https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Forms/Data_form_validation#Customized_error_messages https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Form... [1]: https://blog.digicert.com/understanding-the-google-chrome-connection-tab/ https://blog.digicert.com/understanding-the-google-chrome-co...