How does text dragging work in form fields?

Question

css

By default, in forms, you can drag and drop text in this way:

On one of the sites, I encountered the fact that this does not work.
I would never have noticed it myself, but the customer uses this technique)
Interested in what attributes are responsible for this and is it possible to do this without js?

Answer 1

ondrop="return false;"
https://jsfiddle.net/whata/xabs04oc/
I don't think it's possible without js.

Answer 2

It seems to me that this is a simple copy / paste of text implemented by the browser. If such a function is disabled on the site, then it is quite possible that it will not be possible to use it ...