Screen Reader Preview Customization
The Screen Reader Preview feature, which can be customized or completely replaced by a specialized version, is written in XSLT. XSLT is a language for transforming (restructuring) XML documents. Since XHTML is an XML language, converting it to another structure is easy using XSLT.
To instruct the editor to use a custom screen reader preview file, give the location of the file in the <param> tag named ScreenReaderXSLT. For example:
<param name="ScreenReaderXSLT" value="http://myserver/screenreader.xsl" />