rel-nofollow-th

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rel="nofollow"

Specification 10 มกราคม 2548

บรรณาธิการ

คอนเซ็ปต์

ลิขสิทธิ์

This specification is (C) 2005-2024 by the authors. However, the authors intend to submit (or already have submitted, see details in the spec) this specification to a standards body with a liberal copyright/licensing policy such as the GMPG, IETF, and/or W3C. Anyone wishing to contribute should read their copyright principles, policies and licenses (e.g. the GMPG Principles) and agree to them, including licensing of all contributions under all required licenses (e.g. CC-by 1.0 and later), before contributing.

  • Tantek: I release all my contributions to this specification into the public domain and I encourage the other authors to do so as well.
    • When all authors/editors have done so, we can remove the MicroFormatCopyrightStatement template reference and replace it with the MicroFormatPublicDomainContributionStatement.

สิทธิบัตร

This specification is subject to a royalty free patent policy, e.g. per the W3C Patent Policy, and IETF RFC3667 & RFC3668.

บทคัดย่อ

RelNoFollow เป็นไมโครฟอร์แมตมูลฐาน ซึ่งเป็นหนึ่งในไมโครฟอร์แมตที่เป็นมาตรฐานเปิด ด้วยการเพิ่ม rel="nofollow" ให้ hyperlink หน้าเว็บนั้นแสดงเจตจำนงว่าหน้าที่ hyperlink นั้นชี้ไปไม่ควรจะได้รับการพิจารณาพิเศษจาก user agent ต่างๆที่วิเคราะห์ลิงก์ในหน้าเว็บ (เช่นเสิร์ชเอ็นจิน) กรณีใช้งานทั่วไปก็เช่น ลิงก์ที่สร้างโดยผู้แสดงความคิดเห็นบนบล๊อก หรือลิงก์ที่ผู้เขียนอยากจะชี้ไปถึงแต่ไม่ได้เป็นคนเขียนเอง สำหรับการสลักหลัง (หรือไม่สลักหลัง) ดู VoteLinks.

XMDP profile

<dl class="profile">
 <dt id="rel">rel</dt>
 <dd><p>
   <a rel="help" href="http://www.w3.org/TR/html401/struct/links.html#adef-rel">
     HTML4 definition of the 'rel' attribute.</a>  
   Here is an additional value.</p>
  <dl>
   <dt id="nofollow">nofollow</dt>
   <dd>Indicates that the referred resource was not necessarily linked to 
       by the author of the page, and thus said reference should not afford 
       the referred resource any additional weight or ranking by user agents. </dd>
  </dl>
 </dd>
</dl>

ตัวอย่างในอินเทอร์เน็ต

This section is informative. Note: There are numerous uses of rel-nofollow in the wild, this is very much an incomplete list. If your site marked up with rel-nofollow, feel free to add it to the top of this list. Once the list grows too big, we'll make a separate wiki page (rel-nofollow-examples-in-wild).

  • FunAdvice supports using the rel-nofollow tag to prevent users posting content simply for the search engine benefit, to improve the quality of the advice giving community.

แหล่งอ้างอิงหลัก

แหล่งอ้างอิงเพิ่มเติม

  • VoteLinks can be used by an author to explicitly state their support for or against, or neutrality toward the destination of a link. Implementers implementing rel="nofollow" and VoteLinks should similarly not afford any additional weight or ranking to links with either rev="vote-abstain" or rev="vote-against".
  • Contributed from http://developers.technorati.com/wiki/RelNoFollow

ปัญหาที่พบ

These are open issues that have been raised about rel="nofollow" that have been raised in various forums, in particular, on the public W3C www-html mailing list. Once the list grows too big, we'll make a separate wiki page (rel-nofollow-issues). The issues have been grouped into four areas.

  • Definition. nofollow indicates a behavior rather than a relationship from which the behavior should be inferred as appropriate for the useragent. rel values should be nouns that indicates what the resource being referenced is in relation to the source.
  • Name. nofollow is a bad name.
    • overloading. does not mean the same as robots exclusion standards (robots.txt, meta robots) nofollow.
    • does not mean what it says. does not mean "do not follow this link", rather it means " do not add weight from this link". Asbjørn Ulsberg
    • not a noun. see above.
    • suggested alternatives:
  • Efficacy. nofollow will not affect spamming behavior.
  • Collateral Damage. If tools automatically add nofollow to all 3rd party links, then many legitimate non-spam links will be ignored or given reduced weight, and thus the destination of such links will be unfortunate casualties.
  • Fallacious. Not endorsing is not equivalent to not available to tying semantic relations. Pro- and contra sides are relevant to each other, even though they might refuse to "endorse" eachother.

ปัญหาอื่นๆ

Additional lists of issues raised against rel="nofollow" can be found at the following site(s):

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