Semantic Markup simply means using HTML elements to show the semantics or how words are used on the page or website. HTML is processed by traditional web browsers as well as by many other user agents.
Section 508 Accessibility of the Rehabilitation Act of 1973 requires federal agencies to provide software and website accessibiity to people with disabilities. When websites are 508 Compliant, they are accessible to all users.
Search Engine Optimixation
SEO is getting traffic from the natural search results on search engines.it affects the online visibility of a website.
How They Relate
These three work together by allowing anybody who can use a computer to view and understand HTML, no matter if they have a disability or not, and allows users to be able to search for the websites they would like to visit that usses the HTML language.
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Mitchell,Bradley."What's the Difference between SAN and NAS storage?" Lifewire, www.lifewire.com/san-vs-nas-818005. 07 Dec 2018.