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Several basic attributes types have been recognized, including: (1) required attributes needed by a particular element type for that element type to function correctly; (2) optional attributes used to modify the default functionality of an element type; (3) standard attributes supported by many element types; and (4) event attributes used to ...
Hreflang specifies the language and optional geographic restrictions for a document. Hreflang is interpreted by search engines and can be used by webmasters to clarify the lingual and geographical targeting of a website .
The attribute was first introduced in the HTML 1.2 draft in 1993 to provide support for text-based browsers. [1] In HTML 4.01, which was released in 1999, the attribute was made to be a requirement for the img and area tags. [2] It is optional for the input tag and the deprecated applet tag. [3]
The optional "title" attribute value must be parsable as text. The optional "data" attribute value is set to an unparsed external entity. The optional "type" attribute value can only be one of the two notations.--> <!ATTLIST img title CDATA #IMPLIED data ENTITY #IMPLIED type NOTATION (type-image-svg | type-image-gif) #IMPLIED > <!--
An ordered (enumerated) list. The type attribute can be used to specify the kind of marker to use in the list, but style sheets give more control. The default is Arabic numbering. In an HTML attribute: < ol type = "foo" >; or in a CSS declaration: ol {list-style-type: foo;} – replacing foo with one of the following: A, B, C ...
Model group and attribute group definitions. These are essentially macros: named groups of elements and attributes that can be reused in many different type definitions. An attribute use represents the relationship of a complex type and an attribute declaration, and indicates whether the attribute is mandatory or optional when it is used in ...
RDFa was defined in 2008 with the "RDFa in XHTML: Syntax and Processing" Recommendation. [16] Its first application was to be a module of XHTML.. The HTML applications remained, "a collection of attributes and processing rules for extending XHTML to support RDF" expanded to HTML5, are now expressed in a specialized standard, the "HTML+RDFa" (the last is "HTML+RDFa 1.1 - Support for RDFa in ...
A few other attributes are also present in the example, either as a session-level attribute (such as the attribute in property form a=recvonly), [note 3] or as a media-level attribute (such as the attribute in value form a=rtpmap:99 h263-1998/90000 for the video in the example).