Maybe my 2 followers thought about where have I disappeared?
After completing the module I decided to make interactive tutorial out of DOM because I didn't understand everything fully and here's my site on CodePen

Long story short, I underestimated how hard it is to do a website like that so it took me a few days, but after all I managed to make this behemoth, the site is not responsive and the code is very bad but hey, at least I am confident in my DOM skills now. Maybe this site will also help you to understand it a little bit better.

Feel free to leave comment or advice!