What is one of the main benefits of using HTML5?

One of the main benefits of using HTML5 is that it introduces new semantic elements. These semantic elements, such as <header>, <footer>, <article>, and <section>, provide a clearer structure to web documents, enhancing both readability for developers and accessibility for users. By using these elements, developers can create a more meaningful markup that describes the role of different parts of a webpage. This aids search engines in understanding the content better, improving SEO, and helps assistive technologies, like screen readers, in providing context to users with disabilities.

The other options do not reflect the advantages of HTML5. For example, HTML5 does not eliminate the need for CSS; rather, it works alongside CSS to enhance styling. Additionally, it was designed with backward compatibility in mind, thus improving rather than reducing compatibility with older browsers. Finally, HTML5 is an open standard and does not require a paid license for use, making it accessible to all developers.