Sidebar with its own url

I’m currently trying to implement the following feature on my site -
work case detail pages appear as sidebars with its own url.
Here is an example: https://area17.com/

Concerning that topic I found this post:

Unfortunately, the suggested solutions seem not to work.

Any Idea?

The example website is done using lots of custom unconventional JavaScript, not by a simple jQuery load function call. Furthermore, the pages seem to be highly optimized so it appears to be loaded in an instant.

Anyway, to answer your question, yes, you can change the page URL in JavaScript without navigating to another page. javascript - How do I modify the URL without reloading the page? - Stack Overflow