How to bookmark the browser in JS to go to the url of the current domain in the window + /custom url?

Question

JavaScript

To begin with, I just tried to pull out the domain code
javascript: window. open (location. hostname);

as a result, instead of https://qna.habr.com/ opens https://qna.habr.com/qna.habr.com

Answer 1

window.open("http://" + location.hostname)
console.log(location.hostname)