How do I insert content (especially links?)

Nonyhost

I can insert content into a page with ::after or ::before and that does put the text string where I want it, but not the full content.

I want to add new links to a list of links in the sidebar of a site. Right now either I can't get them to function as independant links (they're just a link to whatever they're ::after or ::before) or can't get them to behave as links at all (I can put them ::after the site header and work them into the top of the list via margins, but then they're just text, not links).

stonecrusher

You can't add links, just text/image. Limitation of CSS.
https://www.w3.org/TR/2011/REC-CSS2-20110607/generate.html
CSS actually is for styling which isn't meant for changing content / markup.

Nonyhost

That's unfortunate. What would I have to use to insert links and other content into a website?

Ben Landin

You'd have to use an extension such as Tampermonkey and a UserScript (which is JavaScript).