Dynamically loading webpage info - basic Recipe edit?

[ArtVanderlay]

Hi all,

can anyone instruct me how to dynamically load the webpage source data via the recipe.

e.g.
as a user,
1. I click on this link https://kalendar.laudato.hr/Dan.aspx?datum=13-02-2021
2. click on 'Casoslov' -> it expands and displays div content
3. click on 'Jutarnja' -> it expands and displays the div content I want to extract via the recipe

The problem - the basic recipe only gives me this: https://www.flickr.com/photos/192112...posted-public/

And I want the whole text displayed on the picture on the link below:
https://www.flickr.com/photos/192112...posted-public/

If someone can put me in the right direction to do this exctraction via the Recipe, I would be very gratefull.
I have the backup plan, but I want to learn how to do this programatically.

Best Regards,