jorisdw

Hello,

I' trying to make an hierarchy in collapsibles. 

For example: open a first section, and in that subsection 3 new collapsibles should appear. 

I've managed to figure out somewhat how this should work. However, I am not able to make the second level collapsibles "collapse". 

HTML is quite new for me so, is there someone who could help me out with this? 

I add a file in attachment with the code I have so for. 

Thanks & kind regards, 

Joris 

test.html