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1. Relating with Meta Robots and Robots.txt
(Seo Articles/Seo for Beginners)

... It must be an ASCII text file, not an HTML file and should be in lowercase.   Robots can be used for a number of purposes.  It can be utilized as HTML validation, Link validation, Indexing, Mirroring, ...

2. Verifying the Validity of your HTML Code
(Seo Articles/Seo for Beginners)

... Html Validator 0.8.5.6. This is a Firefox add-on that adds HTML validation within Firefox and Mozilla. The quantity of errors of an HTML page is seen in the form of an icon in the status bar.  This is ...