Valid XHTML

Test Weight: very high
HTML is a mark-up language used to create websites, and is independent of platforms.

"HTML is not a programming language, since HTML does not allow to, say, control a robot, set a variable or programme a game." (Quelle)

The display of invalid or incorrect documents depends on the software reading them (browser, roboter, screenreader, etc; see above). However, the display will vary greatly depending on the software, and this can lead to errors, often without the knowledge of the website manager, since it is impossible to test the website against all updates of all the software.

Non validated HTML source text can cause high costs, especially if it causes the software to look for an error or if the functionality and therefore the user experience is impacted.  


Further information:
The validity of the HTML source text can be checked with a so-called 'validator'.

Examples:

Further information
http://blog.antikoerperchen.de/beitrag/28/validierung-wozu-warum-valider-html-code-wichtig-ist.html


Acronyms: 
HTML: HyperText Markup Language

An additional tool is available for this test, which allows to highlight any warning, hints and tips in the source text of the website. Click here for the tool: http://www.qualidator.com/Web/en/ProductsServices/SiteAnalyzer2.htm

Test Results

  • Total 100% 100000
  • Not tested 71.9% 71976
  • Warning 24.4% 24493
  • Suggestion 1.1% 1138
  • Hint 0.7% 721
  • Passed 1.6% 1672
  • Total amount of tests run.
  • The tested website was not built with XHTML and therefore cannot be tested against the validity of its XHTML source text.
  • The tested website appears to use HTML, but the source text contains errors. Use the Qualidator SiteAnalyzer to find the errors on your site. Please note that it is not sufficient to validate the homepage only. To optimise access it is necessary that all pages are validated, so that display errors in various browsers can be avoided.
  • Only some of the pages are valid, but not all.
  • The majority of the pages are valid, but not all.
  • The tested website contains valid XHTML source text.

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User Comments

9/21/2018 5:06:56 AM Administrator
Comments welcome
We welcome any kind of questions, comments and criticism with regards to this test, such as:
  • Good & bad aspects
  • Reporting errors and spelling issues
  • Reporting dead links
  • Additions
  • Comments on the weighting of the test (see at the top)
  • Reporting wrong or additional sources and further information (links)
  • General questions about this test
Should you not wish to have your comments potentially published, please send them to qualidator@seven49.net.
4/12/2012 12:16:22 PM Paul
RDFa Leider erkennt Ihr Tool RDFa nicht und behauptet der Code sei nicht valide. Ein Test auf W3C ergibt jedoch validen XHTML+RDFa Code.

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Do you already know the Qualidator® SiteAnalyzer?
The Qualidator® SiteAnalyzer is a Windows application, developed to allow a one step, page by page, automated validation of an entire web project (XHTML & CSS), and to review the quality by carrying out over 30 additional tests.

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Recommendation: Uptime Monitoring

Recommendation: HTML2PDF Rendering Service

Key Benefits
  • Renders URLs of (dynamic)(x)html pages including CSS to PDF on the fly
  • html2pdf is a Service NOT a class library or EXE
  • Very easy to use

Tell me more about the HTML2PDF Rendering Service

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Quelle: http://www.qualidator.com/WQM/en/TestInfo/ValidXhtml.aspx
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