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 majority of the pages are valid, but not all.
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A potential hint has been identified.
"Description" is used to summarise the content of a HTML-page as short and incisive as possible. The content of this meta information is not shown to the user in the internet browser, but search engines do use them to a certain extent to evaluate the relevance of a site for the results page.
The description summarises the content in one sentence. The summaries are normally shown on the results page of search engines and contribute a great deal to the choice of web users.
Further information:
http://de.selfhtml.org/html/kopfdaten/meta.htm#beschreibung
Descriptions are either incomplete or not optimised on the tested website. Verify that the homepage and the sub-pages contain an appropriate description (a short and incisive sentence).
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A potential hint has been identified.
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A potential hint has been identified.
This test result is available for registered users and Premium Members.
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A potential hint has been identified.
This test result is available for registered users and Premium Members.
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A potential hint has been identified.
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A potential hint has been identified.
Using the ideal number of keywords can contribute to the searchability of a website. However, search engines may class it as "keyword spam" if too many keywords are used.
The number of keywords contained in the tested website is not optimal.
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A potential hint has been identified.