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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/copy_event below:

Element: copy event - Web APIs

Baseline Widely available

The copy event of the Clipboard API fires when the user initiates a copy action through the browser's user interface.

The event's default action is to copy the selection (if any) to the clipboard.

A handler for this event can modify the clipboard contents by calling setData(format, data) on the event's ClipboardEvent.clipboardData property, and cancelling the event's default action using event.preventDefault().

However, the handler cannot read the clipboard data.

It's possible to construct and dispatch a synthetic copy event, but this will not affect the system clipboard.

This event bubbles, is cancelable and is composed.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("copy", (event) => { })

oncopy = (event) => { }

<div class="source" contenteditable="true">Copy text from this box.</div>
<div class="target" contenteditable="true">And paste it into this one.</div>

div.source,
div.target {
  border: 1px solid gray;
  margin: 0.5rem;
  padding: 0.5rem;
  height: 1rem;
  background-color: #e9eef1;
}

const source = document.querySelector("div.source");

source.addEventListener("copy", (event) => {
  const selection = document.getSelection();
  event.clipboardData.setData("text/plain", selection.toString().toUpperCase());
  event.preventDefault();
});

• Related events: cut, paste
• This event on Document targets: copy
• This event on Window targets: copy

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