[Symbiote]

I tried with http://њњњ.срб , which Firefox copies correctly, but Chromium copies as http://xn--g2aaa.xn--90a3ac/ — not very useful.

This is a different mechanism to the path part, where both Firefox and Chromium give https://ru.wikipedia.org/wiki/%D0%A0%D0%BE%D1%81%D1%81%D0%B8... rather than the readable https://ru.wikipedia.org/wiki/Россия

[rzzzt]

The two methods are punycode [1] and percent encoding [2].

[1] https://en.wikipedia.org/wiki/Punycode

[2] https://en.wikipedia.org/wiki/Percent-encoding

[Dylan16807]

If you select the entire URL bar, you get the encoded form. If you leave off the protocol, or just the h, you get it unencoded.