"Copy to Clipboard" doesn't work?
For Linux users: On distros with multiple clipboards, the problem seems to be that Godot isn't able to copy into the right clipboard from a web build. There's nothing I can do about this, sorry.
For Chrome users: Godot games seem to be unable to access the Clipboard API properly, so it gets blocked for security reasons. Trying to allow Clipboard access in Chrome will not work either.