help needed with javascript and "this" object

You can only read inline css by element.style. To read external css, use getComputedStyle(element). https://code.sololearn.com/WNqeyFk7F370/?ref=app

ᐺ ! ᖇ ᖶ ᒪ Calviղ's solution works fine, but i'm interested by your solution if it's a different one. Understanding what happens with all these ways to create functions with JS is not very intuitive when coming from python 😂 I "tried to try" 😅 what you suggest, but did not see a difference. Could you be more precise how to do it ?

Yes, perfect 😃👌 Thank you so much Calviղ ! My problem is solved.

ᐺ ! ᖇ ᖶ ᒪ😊 Got it, thanks

Cépagrave it doesn't have a difference visually but I think it's more logical to attach a function to event instead of using `this`

Arrow functions don't have bind to `this`. Try using addEventListener with event target

Haha