This document provides:

These styles can be used in any of the javadocs or web page content.

For example, the following highlighted text is shown on the Juneau website:

All we're doing here is defining our own extended tags in the stylesheet to provide highlights.  

<p class='bcode'>
   <jc>// A simple POJO class</jc>
   <jk>public class</jk> Person {
      <jk>public</jk> String name = <js>"John Smith"</js>;
      <jk>public int</jk> age = 21;
   }
   ...
</p> 

Two classes to apply to block elements (typically <p> tags):

• class='code' - Unbordered code block.

• class='bcode' - Bordered code block.

The following elements are defined:

• <jc> - Java comment
• <jd> - Javadoc comment
• <jt> - Javadoc tag
• <jk> - Java keyword
• <js> - Java string
• <jf> - Java field
• <jsf> - Java static field
• <jsm> - Java static method
• <ja> - Java annotation
• <xt> - XML tag
• <xa> - XML attribute
• <xc> - XML comment
• <xs> - XML string
• <mk> - Manifest file key
• <mv> - Manifest file value
• <cc> - Config file comment 
• <cs> - Config file section
• <ck> - Config file key
• <ce> - Config file entry

If marking up the language is too tedious, the sample REST app also includes a code formatter resource:

The formatter resource is not perfect.  For example, it can't detect static methods and fields.  But it's will provide a good starting point, especially for XML.