How to target "::after" in JS? Am I blind? What do I miss?

Question

I'm trying to target the "::after" of an element but everything I try fails.
What am I missing or can't this be done?

var navigation = document.getElementById("s5_left_column_wrap");
var lastchild = navigation.lastChild;

https://code.sololearn.com/WcL4TOM96HcZ

Answer 1

Thank you, i'll try that and update the post if successful.

EDIT: Changed and tried some more but still no luck. Undefined.

Answer 2

::after (and ::before) are called "pseudo-elements": they are unreachable through Javascript or even through the 'style' inline attribute, unfortunally, but quite logically ;) (behind the scene, they are not part of the DOM -- Document Object Model)

Anyway, there are some tricky workarounds:

http://pankajparashar.com/posts/modify-pseudo-elements-css/

Answer 3

Thank you visph. Inspectors (FF & Chrome) show a lot Information about the pseudos but a small script to log all of the body's child elements did not reveal the pseudos. best regards, C.