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2. W3C Markup Validation Service - Wikipedia

   en.wikipedia.org/wiki/W3C_Markup_Validation_Service

   The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

3. Xenu's Link Sleuth - Wikipedia

   en.wikipedia.org/wiki/Xenu's_Link_Sleuth

   Xenu, or Xenu's Link Sleuth, is a computer program that checks websites for broken hyperlinks. [1] It is written by Tilman Hausherr and is proprietary software available at no charge . The program is named after Xenu , the galactic ruler from Scientology scripture .

4. Bobby (software) - Wikipedia

   en.wikipedia.org/wiki/Bobby_(software)

   The original Bobby was a free online tool, written by Josh Krieger and provided by the Centre for Applied Special Technology (CAST), used to validate websites for WAI and Section 508 compliance. Launched in 1995, [ 1 ] it became well known for the usage of the Bobby Approved icon that website authors could use to indicate they have successfully ...

5. PageRank - Wikipedia

   en.wikipedia.org/wiki/PageRank

   A PageRank results from a mathematical algorithm based on the webgraph, created by all World Wide Web pages as nodes and hyperlinks as edges, taking into consideration authority hubs such as cnn.com or mayoclinic.org. The rank value indicates an importance of a particular page. A hyperlink to a page counts as a vote of support.

6. AOL

   search.aol.com

   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

7. Web analytics - Wikipedia

   en.wikipedia.org/wiki/Web_analytics

   Web analytics is the measurement, collection, analysis, and reporting of web data to understand and optimize web usage. [1] Web analytics is not just a process for measuring web traffic but can be used as a tool for business and market research and assess and improve website effectiveness.