background colour change when prompt window appears, how to do this using js?

Question

background colour change when prompt window appears in the website

Answer 1

Here is a SoloLearn lesson about changing attributes and style of an element.

https://www.sololearn.com/learn/o-JavaScript/2754/?ref=app

And this is a lesson about prompts.

https://www.sololearn.com/learn/o-JavaScript/1149/?ref=app

And finally a lesson about events.

https://www.sololearn.com/learn/o-JavaScript/2758/?ref=app

Answer 2

Let me add some words. You can't react on the prompt directly. But before your prompt loads some other events happens. And on these events you can react.
For example window.onload.
But it depends on when you trigger your prompt.