Browser Copy/Paste support documentation

I'm using xterm.js in the browser and it seems copy/and paste functionality varies depending on the users browser and/or platform.

I can copy and paste using the standard Cmd + C and Cmd + V in Google Chrome and Firefox on Mac, but my Linux users are saying that Ctrl + C and Ctrl + V don't work for them in Google Chrome, but Ctrl + Shift + V does (But not Ctrl + Shift + C).

It would be good to get some documentation around what are the default keybindings and whether they are supported in all browsers – or some form of matrix to show which commands and browsers are supported so the information can be forwarded to users?