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The role attribute is used to define an element's role on a page. When sectioning elements were introduced, the role attribute became used less for landmarking. This is because roles were applied by default to most sectioning elements, therefore, they were more widely used and accepted for their simplicity. [5]
Where element names the HTML element type, and attribute is the name of the attribute, set to the provided value. The value may be enclosed in single or double quotes, although values consisting of certain characters can be left unquoted in HTML (but not XHTML). [2] [3] Leaving attribute values unquoted is considered unsafe. [4]
The property's name and value context are described by the item's vocabulary. Properties values usually consist of string values, but can also use URLs using the a element and its href attribute, the img element and its src attribute, or other elements that link to or embed external resources. [1]
A description list (a.k.a. association list or definition list) consists of name–value groups, [21] and was known as a definition list prior to HTML5. [22] Description lists are intended for groups of "terms and definitions, metadata topics and values, questions and answers, or any other groups of name–value data". [23]
[75] [76] Leaving attribute values unquoted is considered unsafe. [77] In contrast with name-value pair attributes, there are some attributes that affect the element simply by their presence in the start tag of the element, [7] like the ismap attribute for the img element. [78] There are several common attributes that may appear in many ...
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
Attribute-list declarations name the allowable set of attributes for each declared element, including the type of each attribute value, if not an explicit set of valid values. DTD markup declarations declare which element types , attribute lists , entities , and notations are allowed in the structure of the corresponding class of XML documents.
With HTML up to and including HTML 4.01 and XHTML, there were four valid attributes: content, http-equiv, name and scheme. Under HTML 5, charset has been added and scheme has been removed. http-equiv is used to emulate an HTTP header, and name to embed metadata. The value of the statement, in either case, is contained in the content attribute ...