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
The tested website appears to use XHTML, 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.
Marking previously visited hyperlinks helps users to identify which pages of the website have previously been read. In other words, according to Nielsen the navigation interface should answer three essential questions: "Where am I?", "Where have I been?" and "Where can I go?"
Source and further information:
"Prioritizing Web Usability" by Jakob Nielsen/Hoa Loranger and "Designing Web Usability" by Jakob Nielsen
The tested website does not support fully this type of marking.
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A potential warning has been identified.
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A potential warning has been identified.
The titles need to be ordered in a sytematic and logical way, i.e. there can be no jump going from h1 toi h6. In addition, the first title must be h1.
Further information:
http://www.vorsprungdurchwebstandards.de/theory/retro-coding/
(Chapter: "Semantisch strukturiertes HTML" = "Semantically structured HTML)
text id wqm_detailedreportheadingscorrectorderdescriptionatresultcode8 not found
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A potential warning has been identified.
This test result is available for registered users and Premium Members.
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A potential warning has been identified.