On the link element, the "type" attribute's value is an advisory media type: it is a hint about the type of the representation that is expected to be returned when the value of the href attribute is dereferenced. Note that the type attribute does not override the actual media type returned with the representation. Link elements MAY have a type attribute, whose value MUST conform to the syntax of a MIME media type [MIMEREG].
The "hreflang" attribute's content describes the language of the resource pointed to by the href attribute. When used together with the rel="alternate", it implies a translated version of the entry. Link elements MAY have an hreflang attribute, whose value MUST be a language tag [RFC3066].
The "title" attribute conveys human-readable information about the link. The content of the "title" attribute is Language-Sensitive. Entities such as "&" and "<" represent their corresponding characters ("&" and "<", respectively), not markup. Link elements MAY have a title attribute.
The "length" attribute indicates an advisory length of the linked content in octets; it is a hint about the content length of the representation returned when the IRI in the href attribute is mapped to a URI and dereferenced. Note that the length attribute does not override the actual content length of the representation as reported by the underlying protocol. Link elements MAY have a length attribute.
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