Merge branch 't/13317' into major

tests/plugins/clipboard/manual/buttons.html

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+<textarea cols="80" id="classic" name="classic" rows="10">
+	<p>¯\_(ツ)_/¯</p>
+	<blockquote>
+		<p>Success is going from failure to failure without losing enthusiasm.</p>
+		<cite>– Winston Churchill</cite>
+	</blockquote>
+</textarea>
+
+<script>
+	var editor = CKEDITOR.replace( 'classic', {
+		allowedContent: true
+	} );
+
+	editor.on( 'instanceReady', function() {
+		var editable = editor.editable();
+
+		editable.on( 'copy', function() {
+			editor.showNotification( 'copy event fired.' );
+		} );
+
+		editable.on( 'cut', function() {
+			editor.showNotification( 'cut event fired.' );
+		} );
+
+		editable.on( 'paste', function() {
+			editor.showNotification( 'paste event fired.' );
+		} );
+	} );
+</script>

tests/plugins/clipboard/manual/buttons.md

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+@bender-ui: collapsed
+@bender-ckeditor-plugins: wysiwygarea, toolbar, clipboard, floatingspace, htmlwriter, blockquote, notification
+
+1. Select some text in the editor.
+2. Click the *Copy* button.
+3. Click somewhere else.
+4. Press `Ctrl + V` to paste the text.
+
+#### Expected result:
+
+**Chrome:** Selected text should be copied into clipboard and pasted into editor. Notifications should be opened for copy and paste.
+
+**IE:** A security alert may be displayed – confirm it. After confirming it everything should be the same as in Chrome.
+
+**Other browsers:** There should be a notification with information that copying is not available.
+
+----
+
+1. The same as above, but use the *Cut* button.
+
+#### Expected result:
+
+The same as above.
+
+----
+
+1. Copy some text from the editor.
+2. Press the *Paste* button.
+
+#### Expected result:
+
+**IE:** A security alert may be displayed – confirm it. After confirming the content should be pasted.
+
+**Other browsers:** The paste dialog should be displyed.