HTMLElement.oncopy - Web APIs
the oncopy property of the htmlelement interface is an eventhandler that processes copy events.
... syntax target.oncopy = functionref; value functionref is a function name or a function expression.
... text into this field!</textarea> <h3>log:</h3> <p id="log"></p> javascript const log = document.getelementbyid('log'); function logcopy(event) { log.innertext = 'copy blocked!\n' + log.innertext; event.preventdefault(); } function logpaste(event) { log.innertext = 'paste blocked!\n' + log.innertext; event.preventdefault(); } const editor = document.getelementbyid('editor'); editor.oncopy = logcopy; editor.onpaste = logpaste; result specification whatwg standard ...

dom.event.clipboardevents.enabled
the emitting of the oncopy, oncut and onpaste events are controlled by this preference.
... type:boolean default value:true exists by default: no application support: gecko 13.0 (firefox 13.0 / thunderbird 13.0 / seamonkey 2.10) status: active; last updated 2012-02-15 introduction: pushed to nightly on 2012-02-14 bugs: bug 542938 values true (default) the oncopy, oncut and onpaste events are enabled for web content.
... false the oncopy, oncut and onpaste events are disabled for web content.

nsIClipboardDragDropHooks
method overview boolean allowdrop(in nsidomevent event, in nsidragsession session); boolean allowstartdrag(in nsidomevent event); boolean oncopyordrag(in nsidomevent aevent, in nsitransferable trans); boolean onpasteordrop(in nsidomevent event, in nsitransferable trans); methods allowdrop() tells gecko whether a drop is allowed on this content area.
...oncopyordrag() alters the flavors or data presented to the os.
...boolean oncopyordrag( in nsidomevent aevent, in nsitransferable trans ); parameters aevent the dom event (drag drop).

Document - Web APIs
document.oncopy represents the event handling code for the copy event.
... also available via the oncopy property.

Processing XML with E4X - Archive of obsolete content
objects representing xml elements provide a number of useful methods, some of which are illustrated below: todo: add all of the methods to the javascript reference, link from here alert(person.name.text()) // bob smith var xml = person.name.toxmlstring(); // a string containing xml var personcopy = person.copy(); // a deep copy of the xml object var child = person.child(1); // the second child node; in this case the <likes> element working with xmllists in addition to the xml object, e4x introduces an xmllist object.

Preference reference
the emitting of the oncopy, oncut and onpaste events are controlled by this preference.

Document: copy event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncopy the original target for this event is the element that was the intended target of the copy action.

Element: copy event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncopy the event's default action is to copy the selection (if any) to the clipboard.

Element - Web APIs
also available via the oncopy property.

HTMLElement.oncut - Web APIs
ows="3">try copying and cutting the text in this field!</textarea> <h3>log:</h3> <p id="log"></p> javascript function logcopy(event) { log.innertext = 'copied!\n' + log.innertext; } function preventcut(event) { event.preventdefault(); log.innertext = 'cut blocked!\n' + log.innertext; } const editor = document.getelementbyid('editor'); const log = document.getelementbyid('log'); editor.oncopy = logcopy; editor.oncut = preventcut; result specification whatwg standard ...

HTMLElement.onpaste - Web APIs
area:</h3> <textarea id="editor" rows="3">try copying and pasting text into this field!</textarea> <h3>log:</h3> <p id="log"></p> javascript function logcopy(event) { log.innertext = 'copied!\n' + log.innertext; } function logpaste(event) { log.innertext = 'pasted!\n' + log.innertext; } const editor = document.getelementbyid('editor'); const log = document.getelementbyid('log'); editor.oncopy = logcopy; editor.onpaste = logpaste; result specification whatwg standard ...

HTMLElement - Web APIs
htmlelement.oncopy returns the event handling code for the copy event (bug 280959).

Index - Web APIs
1632 htmlelement.oncopy api, event handler, experimental, htmlelement, needsspectable, property, reference the oncopy property of the htmlelement interface is an eventhandler that processes copy events.

SVGGraphicsElement: copy event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncopy the event's default action is to copy the selection (if any) to the clipboard.

Window: copy event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncopy the original target for this event is the element that was the intended target of the copy action.