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A validation is the validity verification of a website, for example, against applicable standards. A validator is a program that can be used to check compliance with a standard.
Validation of a website
Properties of a valid web page
HTML documents are displayed correctly by many Browsers even if they are not valid. Therefore, small errors in the syntax are often unnoticed if a validator is not used specifically. Such errors can be:
- a missing start or end tag, e.g. < h1>
- forgotten characters, such as ", <,>
- non-existing ALT attributes
Even if these errors seem unimportant at first glance, it is the job of a Webmaster to create error-free (HTML and CSS) code, as is the case in other languages. A correct syntax should be self-evident in programming and in the verbal language. Validation can also serve as a learning effect, so that the programmer does not get used to the wrong syntax.
The W3C provides its own web page  to validate documents. By entering a URL in the HTML Validator, you can check the Webpage for compliance with standards in a few seconds. The file does not have to be online for this - the settings also allow checking local files on your own computer. In addition, not only HTML documents, but also XHTML, SMIL, MathML, etc., can be validated. Applicable websites are offered for CSS and other similar documents as well.
Alternatively, there is an add-on from Firefox. It displays the errors of a page directly in the browser and may be the faster method.
Validation in another context
- Validation is also relevant for software, since validity is a quality feature. Security can be checked and error-free use of all functions can be ensured.
- The term is also known from empirical social research with regard to the validity of measurement results and whether the right measurement has been taken.
Relevance to search engine optimization
The validation of a web page has two sides. The influence of validity on the ranking is controversial. Google’s own websites are not valid. The background is explained in a video . One idea is that with a large website such as Google, each byte counts during the transfer. By deliberately omitting some tags, some bytes can be saved. This reason, why most pages on the Internet are not valid, should be considered critically.
Validation means that the page should be displayed correctly on different browsers. That is the benefit of a valid page, but it is nevertheless helpful to test a newly created page in different browsers.