Add IE/Edge versions for api.Window.copy_event (#14024)
Add IE/Edge versions for api.Window.copy_event (#14024)

This PR adds real values for Internet Explorer and Edge for the `copy_event` member of the `Window` API, based upon manual testing.

Test Code Used:
```html
<div id="test">
	<input value="Copy me!" />
</div>

<script>
	window.addEventListener('copy', function() {
		alert('Copied!');
	});
</script>
```
mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data