Semantic markup is used as HTML markup tools to reinforce the Semantics, or meaning, of the information in webpages and web applications rather than just simple presentation or look.
Section 508 of the Rehabilitation Act requires that all federal agency sites should be accessible by people with disabilities.
SEO is the process of increasing the number of visitors to a wegpage by ensuring that the site appears high on the list of results returned by a search engine.
Semantaic markup, 508 Acessibility and Search optimization working together will provide users a better experience. Without having semantic markup, it might not be as assessable to those people with disabilities.
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