In early 2005, Google, Yahoo, and MSN collaborated in creating an extension to the HTML standard for the purpose of reducing comment spam.
The extension was the introduction of the attribute for HTML links.
The purpose of the attribute is to create HTML links which can be viewed and clicked by normal web users, but which will not be counted as a link by the search engines.
This is to enable web logs and web forums to allow users to post links in messages and signatures -- without encouraging link spammers to abuse that system.
A normal HTML link looks like this:
alt.internet.search-engines FAQ
A link with the attribute looks like this:
alt.internet.search-engines FAQ
Alternatives
Before Google, Yahoo, and MSN introduced the attribute, webmasters were achieving similar results using JavaScript links and PHP scripted links.
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