HTML validation

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HTML validation

• Jill R. SommerInstitute of Applied
  LinguisticsKent State University

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What is a validator?

• A validator is a computer program used to check
  the validity or syntactical correctness of a
  fragment of code or document. The term is
  commonly used in the context of validating HTML,
  CSS and XML documents or RSS feeds though it can
  be used for any defined format or language.

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Why should I validate?

• When you validate your files, you run the address
  through a tool that checks the syntax of your
  HTML coding.
• It will point out any errors or invalid HTML code
  to ensure your code is sound.
• You will probably see a few minor errors. You can
  decide whether or not you want to fix them. Major
  errors should definitely be fixed.

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Importance of validating XHTML code

• The Extensible HyperText Markup Language, or
  XHTML, is a markup language that has the same
  expressive possibilities as HTML, but a stricter,
  more verbose syntax
• XHTML code needs to be well-formed (syntactically
  correct) for it to be processed.

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Importance of validating XHTML code

• http//en.wikipedia.org/wiki/XHTML offers a lot
  of really good information on XHTML and offers
  some common errors in XHTML if you need to
  troubleshoot.

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HTML validation services

• W3C Markup Validation Service, a free service
  that checks Web documents in formats like HTML
  and XHTML for conformance to W3C Recommendations
  and other standards.http//validator.w3.org/

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HTML validation services

• WDG HTML Validatorhttp//www.htmlhelp.com/tools/v
  alidator/
• HTML Tidyhttp//prdownloads.sourceforge.net/int64
  /tidy-060405-setup.exe?download
• Firefox page validatorhttps//addons.mozilla.org/
  firefox/249/