XHTML Tracking snippets is an advanced setting in the Code Generator page which adds some extra formatting to the code snippets to support shopping carts or web sites which require XHTML compliance.
XHTML is a strict set of formatting rules for generating web pages.
You only check this box if your cart requires XHTML snippets, otherwise the default is to leave it unchecked.
The changes to the snippet are the inclusion of a CDATA section inside the script tag, and wrapping it with a surrounding <div> tag.
- FastSpring Cart Installation requires this setting to be checked