2.3.4.4 onbeforecopy
onbeforecopy of
type Function
Fires on the source object before the selection is copied to the system clipboard.
Return true
from the event
handler to disable the Copy shortcut.
To invoke, select text and right-click or press Ctrl+C.
Bubbles: Yes
Cancelable: Yes
Context Info: dataTransfer
This attribute is an extension to HTMLElement.
See also onbeforecut, onbeforepaste.