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

HTML5 is partially implemented.

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

• For the attribute not defined in HTML5, the following definitions are applied.

  These definitions are updated version of their original definitions in previous versions of HTML (i.e. HTML 2.x, HTML4, Web Forms 2.0, or early drafts of HTML5).

  For each row in the table below, if an attribute (i.e. an Attr node) met the following conditions, then the value attribute value of the node MUST be valid with regard to the constraints shown in the Value cell of the row. The conditions are:

  • There is an owner element (i.e. the Element node pointed by the ownerElement attribute of the Attr node).
  • The namespaceURI attribute value of the owner element is http://www.w3.org/1999/xhtml.
  • The manakaiLocalName attribute value [@@ TODO: ref] of the owner element is equal to the value in the Element cell of the row.
  • The namespaceURI attribute value of the Attr node is null.
  • The manakaiLocalName attribute value of the Attr node is equal to the value in the Attribute cell of the row.

  Element	Attribute	Value
  body	background	Syntactically same as img src [HTML5]
  img	longdesc	Syntactically same as img src [HTML5]
  input	accept-charset	Same as accept-charset attribute of the form element [HTML5]
  input (type attribute is in Image Button state)	usemap	Syntactically same as img usemap [HTML5]
  object	classid or codebase	Syntactically same as img src [HTML5]
  head	profile	Same as a ping [HTML5]
  object	archive	Same as a ping [HTML5]
  object	codetype	Same as object type [HTML5]
  param	type	Same as object type [HTML5]
  address, div, h1, h2, h3, h4, h5, h6, or p	align	Enumerated attribute [HTML5]
  img or object	align	Enumerated attribute [HTML5]
  input (type attribute is in Image Button state)	align	Enumerated attribute [HTML5], where keywords are: top, middle, bottom, left, right
  br	clear	Enumerated attribute [HTML5]
  param	valuetype	Enumerated attribute [HTML5]
  pre	width	Valid non-negative integer [HTML5]
  ul, ol, dir, menu, or dl	compact	Boolean attribute [HTML5]
  input (type attribute is in Image Button state)	ismap	Boolean attribute [HTML5]
  table	frame or rules	Enumerated attribute [HTML5]
  td	scope	Same as scope attribute of the th element [HTML5]
  tbody, thead, tfoot, colgroup, col, tr, td, or th	align or valign	Enumerated attribute [HTML5]
  form	replace	Enumerated attribute [HTML5]
  input (type attribute is in Image Button or Submit Button state)
  button
  link	target	Valid browsing context name or keyword [HTML5]
  meta	schema	Any string
  a or link	rev	Unordered set of unique space-separated tokens [HTML5] (where any word is allowed)
  table	cellpadding	A non-negative integer [HTML5] or a non-negative integer [HTML5] followed by a % character
  	cellspacing
  a	charset	Same as script charset [HTML5], syntactically
  link
  textarea	pattern	Same as input pattern.
  form	accept	Same as input accept.

• Any value MAY be specified to the version attribute of an html element.
• @@ elements ...

  Element	Content Model	Allowed Context
  center	Same as div [HTML5]

For an input element whose type attribute is add, remove, move-up, or move-down (ASCII case-insensitive) [WF2], attributes that is not allowed for an input element whose type attribute is in the Button state MUST NOT be specified.

The inputmode attribute applies to an input element in Text, E-mail, URL, or Password state. The replace attribute applies to an input element in Image Button or Submit Button state. The usemap attribute applies to an input element in Image Button state. The align attribute applies to an input element in Image Button state. Any of these attributes MUST NOT be specified for an input element whose type attribute is in a state where the attribute does not apply.

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.

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.