What does using semantic HTML primarily improve?

Using semantic HTML primarily improves content accessibility. This means that when elements of a webpage are marked up with HTML tags that clearly describe their purpose and function (such as using <header>, <article>, <nav>, and <footer>), it becomes easier for assistive technologies, like screen readers, to interpret and convey the content to users who have disabilities. Semantic HTML enhances the understanding of the structure and meaning of web content not only for machines but also for users, offering a better navigational experience and clearer context.

This approach also positively impacts search engine optimization (SEO), as search engines can better understand the content of the page. While user engagement, website graphics, and branding efforts are important aspects of web design, they do not directly correlate to the fundamental purpose of semantic HTML, which is to facilitate accessibility for all users.