Conformance

2.1. Definitions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 (see [RFC2119]). However, for readability, these words do not typically appear in all uppercase letters in this specification.

Additional key words, e.g. "User agent (UA)", are defined by CSS 2.1 ( [CSS21], section 3.1).



2.2. Classes of products

The following classes of products (many of which overlap) should consider implementing this specification:

● Web browsers

● User agents that implement one or more of the following types of content: HTML (e.g. [HTML401]), XHTML (e.g. [XHTML10], [XHTML11]), XForms (e.g. [XFORMS10]), SVG (e.g. [SVG10], [SVG11]) or other content languages that contain forms controls or are intended for user interaction
● User agents that implement one or more levels, modules and or profiles of CSS (e.g. [CSS1], [CSS21])



2.4. Profiles

This specification contains a number of informative profiles. These profiles are not mandatory for conformance.



2.4. Extensions

This specification does not define any explicit extension mechanisms. If an implementation needs to extend the functionality of this specification, it must follow any/all guidelines and requirements of extensions as defined in CSS2.1, e.g. Vendor-specific extensions ( [CSS21], section 4.1.2).

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