PEAR::HTML_CSS provides a simple interface for generating
a stylesheet declaration. It is completely standards compliant, and
has some great features:
* Simple OO interface to CSS definitions
* Output to
    - Inline stylesheet declarations
    - Document internal stylesheet declarations
    - Standalone stylesheet declarations
    - Array of definitions

In addition, it shares the following with HTML_Common based classes:
* Indent style support
* Line ending style
