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diff --git a/js/ckeditor/samples/sample.js b/js/ckeditor/samples/sample.js
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+/**
+ * Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md or http://ckeditor.com/license
+ */
+
+// Tool scripts for the sample pages.
+// This file can be ignored and is not required to make use of CKEditor.
+
+( function() {
+	CKEDITOR.on( 'instanceReady', function( ev ) {
+		// Check for sample compliance.
+		var editor = ev.editor,
+			meta = CKEDITOR.document.$.getElementsByName( 'ckeditor-sample-required-plugins' ),
+			requires = meta.length ? CKEDITOR.dom.element.get( meta[ 0 ] ).getAttribute( 'content' ).split( ',' ) : [],
+			missing = [],
+			i;
+
+		if ( requires.length ) {
+			for ( i = 0; i < requires.length; i++ ) {
+				if ( !editor.plugins[ requires[ i ] ] )
+					missing.push( '<code>' + requires[ i ] + '</code>' );
+			}
+
+			if ( missing.length ) {
+				var warn = CKEDITOR.dom.element.createFromHtml(
+					'<div class="warning">' +
+						'<span>To fully experience this demo, the ' + missing.join( ', ' ) + ' plugin' + ( missing.length > 1 ? 's are' : ' is' ) + ' required.</span>' +
+					'</div>'
+				);
+				warn.insertBefore( editor.container );
+			}
+		}
+
+		// Set icons.
+		var doc = new CKEDITOR.dom.document( document ),
+			icons = doc.find( '.button_icon' );
+
+		for ( i = 0; i < icons.count(); i++ ) {
+			var icon = icons.getItem( i ),
+				name = icon.getAttribute( 'data-icon' ),
+				style = CKEDITOR.skin.getIconStyle( name, ( CKEDITOR.lang.dir == 'rtl' ) );
+
+			icon.addClass( 'cke_button_icon' );
+			icon.addClass( 'cke_button__' + name + '_icon' );
+			icon.setAttribute( 'style', style );
+			icon.setStyle( 'float', 'none' );
+
+		}
+	} );
+} )();