Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5220)
+++ /CKEditor/trunk/CHANGES.html	(revision 5221)
@@ -52,4 +52,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/4877">#4877</a> : Fixed CKEditor displays source code in one long line (IE quirks mode + office2003 skin).</li>
 		<li><a href="http://dev.fckeditor.net/ticket/5132">#5132</a> : Apply inline style leaks into sibling words which are seperated spaces.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/3599">#3599</a> : Background color style on sized text displayed as narrow band behind.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/colorbutton/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/colorbutton/plugin.js	(revision 5220)
+++ /CKEditor/trunk/_source/plugins/colorbutton/plugin.js	(revision 5221)
@@ -224,4 +224,10 @@
 	{
 		element		: 'span',
-		styles		: { 'background-color' : '#(color)' }
+		styles		: { 'background-color' : '#(color)' },
+
+		// It's better to apply background color as the innermost style. (#3599)
+		childRule : function( element )
+		{
+			return false;
+		}
 	};