HTML 4.0 Special Entities - HTMLHelp.com

With the exception of HTML 2.0's ", &, <, and >, these entities are all new in HTML 4.0 and may not be supported by old browsers. Support in ...

Is & valid - Stack Overflow

2013年8月2日 - & is "valid", though whether you want to use it is another question. If you're writing a document in XML, then & will be used to ...

convert &amp - Coderanch

This could be one of the most common questions you can think of when dealing with xsl, but still I am unable to get past. Here's the scenario.