# CKEditor Sample — Producing XHTML Compliant Output

This sample shows how to configure CKEditor to output valid XHTML 1.1 code. Deprecated elements (`<font>`, `<u>`) or attributes (`size`, `face`) will be replaced with XHTML compliant code.

To add a CKEditor instance outputting valid XHTML code, load the editor using a standard JavaScript call and define CKEditor features to use the XHTML compliant elements and styles.

A snippet of the configuration code can be seen below; check the source of this page for full definition:

    CKEDITOR.replace( 'textarea_id',
    	{
    		contentsCss : 'assets/output_xhtml.css',

    		coreStyles_bold	: { element : 'span', attributes : {'class': 'Bold'} },
    		coreStyles_italic : { element : 'span', attributes : {'class': 'Italic'} },

    		// More definitions follow.
    	});

Editor 1: <p>This is some <span class="Bold">sample text</span>. You are using <a href="http://ckeditor.com/">CKEditor</a>.</p>