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I would like to know what “Semantic HTML is and how it's used.
Semantic HTML is the use of HTML markup to reinforce the semantics,
Semantic HTML or semantic markup is HTML that introduces meaning to the web page rather than just presentation. For example, a <p> tag indicates that the enclosed text is a paragraph. This is both semantic and presentational, because people know what a “paragraph” is and browsers know how to display them. In HTML4* tags like <b> and <i> are not semantic, because they define only how the text should look (bold or italic) and do not provide any meaning to the text.
Semantic is The CSS Responsive framework like Bootstrap.