In the browser viewer, I have tried copying selection with a keyboard shortcut and with selection popup. Both can fail with a successful rate lower than 50%. It usually requires multiple clicks to copy text to the clipboard.
In Firefox's console, I got:
Code:
document.execCommand(‘cut’/‘copy’) was denied because it was not called from inside a short running user-generated event handler.
With a bit of searching, it appears that "Document.execCommand()" is now
deprecated and should be avoided using.
A direct alternative to this command is not provided, but the new
Clipboard API seems to be
the way to go.