Mouseenter function does not apply to all elements

Mouseenter function does not apply to all elements

Hello folks,

I'm having trouble using the mouseenter function in certain scenarios. Basically my code looks like this:
  1.  $("*").mouseenter(function() {
  2.       ...
  3.     $(this).css('background-color', 'green');
  4.       ...
  5. }
This works for most cases - but for instance for google calendar it does not. The elements inside the purple rectangle (check screenshot) don't fire the mouseenter function (the elements around work fine...).



If I just execute:
  1. $("*").css('background-color', 'green');
All elements (even those inside the purple rectangle) are reached.

I can just assume that it is related to the scripts that google is using - but it still should be possible to reach the elements inside the rectangle - right?

Thank you for reading - help is very appreciated.

Cheers
styggje