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Having a deep understanding of HTML5 and CSS3 is crucial if you want to become a good software developer. HTML5 is the latest version of Hypertext Markup Language that helps you to create layouts for your web applications by adding semantic elements to the markup that makes your web site more readable for the browser. Semantic HTML provides you with more semantic tags so that your layout can look better and cleaner. If you want your website to have more visitors you have to make certain changes to your website design and content so that it is more attractive to a search engine.