Copy incorrectly if my text contains "\r\n" when using firefox

[LiuRhoRamen]

I need to copy text which contains "\r\n". when using firefox, I found that the "\r\n" inside the copied text turned to be "\n\n".
After reading the source code, I found the problem is the use of Selection. (Maybe it's a bug of Firefox)

Heres a simple example to explain the problem:
https://jsfiddle.net/LiuRhoRamen/mo1zfxvb/7/

Maybe It's better to create a textarea, call .select() method and do the copy？

[sudodoki]

yes, that's an issue I have observed as well. Using textarea introduces other issues. Did you try using alternative copy packages?

[LiuRhoRamen]

Yeah, I've found sindresorhus/copy-text-to-clipboard which use textarea, but I'm not sure if it will cause some other issues that you mentioned.
Also I've found there's a new api called navigator.clipboard that can be used in modern browsers.

[A-ZHANG1]

For plain/text, try replace /r/n with ES6/Babel backticks.i.e.
text.replace(/(\r\n)/g,
);
For html, the solution is to create <textarea>.