How To Validate Your HTML Code In Firefox Locally Using Tidy and OpenSP Algorithms

Validate HTML Pages in Firefox using HTML Validator instead of relying on online validation tools.It supports 2 algorithms to validate the HTML both of which are embedded inside Mozilla/Firefox making validation possible locally on your html-validator5machine, without sending  HTML to a third party server.

The HTML Validator  Firefox/Mozilla extension is based on Tidy and OpenSP both developed by Web Consortium W3C and extended by users.It finds HTML errors and classifies them in 3 categories –

  • errors: HTML errors that Tidy cannot fix or understand.
  • warnings: HTML errors that Tidy can fix automatically
  • (optional) accessibility warnings: HTML warnings for the 3 priority levels defined in W3c WAI.
  • html-validator3


    The HTML Validator will propose a corrected version of the page in HTML or convert it to XHTML.It can also be compared to the original version in 2 tabs ( both HTML and browser view).

    In case you need help understanding the error message you can checkout HTMLpedia which contains the help for error messages for well known algorithms like Tidy and OpenSP.

    The best advantage of the firefox plugin is that the user need not be connected to the internet to check for validation of the webpages.

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