What are the HTML /XML Reserved Character/Word and how to escape them ?

About

This page is about the reserved word/characters of XML based language.

What to do with a reserved character ?

If a reserved character is in :

• the value of an attribute, it should be first encoded in a entity
• the node value:
  • in Xml: you need to wrap it in a cdata section
  • in HTML, you need to:
    • encode it in a entity
    • or put in a cdata section aware element such as script or style

List

This list is non-exhaustive.

• The opening < and closing character > of a XML tag
• The end of line is unknown in HTML, you should use:
  • a block element such as the paragraph element
  • or a HTML entity in a attribute value