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Web that doesn’t fulfill the rules of W3C validation must be corrected and adjusted to fulfill it, i.e. to be valid in light of HTML code as well as CSS. These adjustments are realized using W3C tools and rules corresponding to appropriate standards.
There adjustments are done every time the code or text on the web is changed.
Validity by itself influences SEO just partly but it is very important for indexing of the web content by the finders as such.
From previous SEO analysis and SEO evaluation we elaborate the report for client about necessary adjustments of the web for case that these adjustments will have to be proceeding by supplier of client’s current information system. In case that maker of SEO optimizations has access to source codes of the web, then this plan for validity adjustment is informative description of everything what is necessary to correct on the web to make it valid.
This activity of the web validity monitoring and possible adjustments is necessary to repeat every time the source code of the web is adjusted.