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Meta elements can be used to specify page description, keywords and any other metadata not provided through the other head elements and attributes. [1] The meta element has two uses: either to emulate the use of an HTTP response header field, or to embed additional metadata within the HTML document.
Content-Length: The length of the request body in octets (8-bit bytes). Content-Length: 348: Permanent RFC 9110: Content-MD5: A Base64-encoded binary MD5 sum of the content of the request body. Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ== Obsolete [15] RFC 1544, 1864, 4021: Content-Type: The Media type of the body of the request (used with POST and ...
There are also limitations placed by meta:Title blacklist, both the normal blacklisting rules and those tagged by <newaccountonly>. Among the more notable of these are that accounts containing strings implying advanced permissions (e.g. "admin") or impersonating high-profile users are blocked.
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] DL existed in HTML ...
It is also possible to list multiple robots with their own rules. The actual robot string is defined by the crawler. A few robot operators, such as Google, support several user-agent strings that allow the operator to deny access to a subset of their services by using specific user-agent strings. [17] Example demonstrating multiple user-agents:
Knowledge tags are more than traditional non-hierarchical keywords or terms; they are a type of metadata that captures knowledge in the form of descriptions, categorizations, classifications, semantics, comments, notes, annotations, hyperdata, hyperlinks, or references that are collected in tag profiles (a kind of ontology). [42]
The noindex value of an HTML robots meta tag requests that automated Internet bots avoid indexing a web page. [1] [2] Reasons why one might want to use this meta tag include advising robots not to index a very large database, web pages that are very transitory, web pages that are under development, web pages that one wishes to keep slightly more private, or the printer and mobile-friendly ...
An explicit meta tag within the first 1024 bytes of the document; A byte order mark (BOM) within the first three bytes of the document; The HTTP Content-Type or other transport layer information; Analysis of the document bytes looking for specific sequences or ranges of byte values, [5] and other tentative detection mechanisms.