Analyze the role of rel="nofollow" in HTML and the use of the rel attribute_HTML/Xhtml_Web page production

Adding the rel="nofollow" attribute to the link means telling the search engine not to follow the link and not transfer the weight. Careful webmasters may find that many blogs have this attribute added to their friendly links. The purpose of this is Avoid the weight of your website being diluted. The rel attribute means: the relationship between the current page and the pointing page. The rev attribute specifies the relationship from the target document to the source document. Baidu currently supports: rel='noflow' attribute. Proper use of this tag will greatly improve the website.

Webmasters may all know that if a link adds the rel="nofollow" attribute, it means that the search engine is not required to track the link and therefore does not transfer weight. Careful webmasters may find that many blogs have links added The purpose of this attribute is to prevent the weight of your website from being diluted.

What does the rel attribute mean?

The rel attribute means: the relationship between the current page and the pointing page.

The optional attributes rel and rev of the tag represent the formal relationship and direction between the source document and the target document respectively. The rel attribute specifies the relationship from the source document to the target document, while the rev attribute specifies the relationship from the target document to the source document. Both attributes can be used together in the tag.

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1. <a href="xxx.php?page =2" rel="next" rev="prev"><> 

Multiple values ​​of rel or rev attributes are separated by spaces.

Usage of rel attribute

Usually this attribute is used in: link tag/a tag/meta tag, writing example:

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1. <a href='http://www .jb51.net' rel='friend'>Script Homea> 

This rel attribute is actually specially designed for search engines. It is known that Baidu currently supports: rel="nofollow" attribute. Proper use of this tag will greatly improve the website.

The value of the rel attribute

值	描述
alternate	文档的可选版本（例如打印页、翻译页或镜像）。
stylesheet	文档的外部样式表。
start	集合中的第一个文档。
next	集合中的下一个文档。
prev	集合中的前一个文档。
contents	文档目录。
index	文档索引。
glossary	文档中所用字词的术语表或解释。
copyright	包含版权信息的文档。
chapter	文档的章。
section	文档的节。
subsection	文档的子段。
appendix	文档附录。
help	帮助文档。
bookmark	相关文档。
nofollow	Google 使用 "nofollow"，用于指定 Google 搜索引擎不要跟踪链接。
licence
tag
friend

After understanding the above rel="" attributes, we only need to set the connection tags according to the corresponding attributes when designing the web page, which will be of great help to our website optimization.

The above rel attribute is for html format. In the social network era, Weibo/WeChat is rampant. Compared with html, the rel attribute of a tag has XFN specification, so I won’t go into details here.