DOM

The current implementation assumes that there are following requirements:

• The document element (or root element) MUST be allowed to be a root element. For example, an html element in http://www.w3.org/1999/xhtml namespace is allowed to be a root element by the HTML5 specification.

HTML

Conformance checking as per the Web Applications 1.0 (including HTML5) specification and the manakai's Conformance Checking Guideline for Obsolete HTML Elements and Attributes is supported, except for a few newer features such as Microdata and device (those features will be implemented later).

The cache manifest syntax is also supported.

Atom

Atom 1.0 and Atom Threading 1.0 are supported.

However, conformance to some SHOULD-level requirements, as well as some informational guidelines, are currently not checked. In addition, whether an email-address or a Base64 encoding is correct or not is not checked either.

Use of XML digital signature and encryption is not supported.

The current implementation assumes that there are following requirements:

• Elements and attributes in the Atom namespace, as well as attributes in the null namespace for an element in the Atom namespace, MUST NOT be used except for contexts where they are allowed by the Atom specification.
• Inter-element whitespace [HTML5], processing instructions, and comments MUST be ignored for the purpose of conformance of the content of an element.
• When an attribute value is required to be a “MIME media type”, or the attribute in question is type of an in-reply-to element in the Atom Threading 1.0 namespace [RFC 4685], the attribute value MUST be a valid MIME type [WA1].

CSS

CSS @namespace and Selectors Level 3 are fully implemented.

Most of CSS 2.1 (19 July 2007 Candidate Recommendation) is implemented.

Most of CSS Color Module Level 3 (21 July 2008 Last Call Working Draft) is implemented.

Since the CSS 2.1 specification is sometimes ambigious or disagree with browsers, our implementation is tend to copy what browsers do unless there is strong resaon to do different thing.

In addition, the current implementation assumes that there are following requirements:

• The charset parameter of the media type text/css MUST be treated as if it were an unknown parameter for the purpose of determining styling langauge for an HTML style element.
• Content of an HTML style element whose content is interpreted as a CSS style sheet MUST consist of zero or more text nodes. Note that it may also contain zero or more comment and/or processing instruction nodes.

Regular expressions

Regular expression defined in ECMAScript Third Edition Section 15.10.1 is implemented, with the addition of the support for obsolete octal escape notation commonly supported by Web browsers.

To identify ECMAScript regular expressions, the Internet Media Type text/x-regexp-js is used.

WebIDL

WebIDL Editor's Draft revision 1.96 (3 September 2008) is implemented.

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