es of the anchor tag are as follows.
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OPTIONAL. If the HREF attribute is present, the anchor is sensitive text: the start of a link. If the reader selects this text, (s)he should be presented with another document whose network address is defined by the value of the HREF attribute . The format of the network address is specified elsewhere . This allows for the form HREF=”#identifier” to refer to another anchor in the same document. If the anchor is in another document, the attribute is a relative name , relative to the documents address (or specified base address if any).
This refers to the URI specification, which does not cover relative addresses. There is no specification of how to distinguish relative addresses from absolute addresses.
OPTIONAL. If present, the attribute NAME allows the anchor to be the destination of a link. The value of the attribute is an identifier for the anchor. Identifiers are arbitrary strings but must be unique within the HTML document. Another document can then make a reference explicitly to this anchor by putting the identifier after the address, separated by a hash sign .
This feature is representable in SGML as an ID attribute, if we restrict the identifiers to be SGML names.
OPTIONAL. An attribute REL may give the relationship (s) described by the hypertext link. The value is a comma-separated list of relationship values. Values and their semantics will be registered by the HTML registration authority . The default relationship if none other is given is void. REL should not be present unless HREF is present. See Relationship values , REV .
OPTIONAL. The same as REL , but the semantics of the link type are in the reverse direction. A link from A to B with REL=”X” expresses the same relationship as a link from B to A with REV=”X”. An anchor may have both REL and REV attributes.
OPTIONAL. If present, this specifies a uniform resource number for the document. See note .
OPTIONAL. This is informational only. If present the value of this field should equal the value of the TITLE of the document whose address is given by the HREF attribute. See note .
OPTIONAL. The value of this field is a string which if present must be a comma separated list of HTTP METHODS supported by the object for public use. See note .
All attributes are optional, although one of NAME and HREF is necessary for the anchor to be useful. See also: LINK .