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Using more semantic and structured HTML makes it easier and quicker to understand code created by somebody else. By using semantic HTML, you will make the different parts of a document meaningful to any web browser, be it the very latest graphical web browsers on a modern PC, an old web browser that doesn't handle CSS, or a text-based browser in a Unix shell.
Semantic HTML, where structure is separated from presentation, makes it easier for screen readers and alternative browsing devices to interpret the content.
The separation of content and presentation makes the content represent a larger part of the total file size. Combined with semantic markup this will improve search engine rankings.
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