The article highlights five underrated HTML tags that every developer should know: `<details>`, `<dialog>`, `<picture>`, `<time>`, and `<output>`. These semantic elements offer several benefits, including improved accessibility, SEO advantages, cleaner code, and better performance. By using these HTML tags, developers can create more efficient, accessible, and maintainable applications. The article also discusses browser compatibility strategies, feature detection techniques, and testing methods to ensure seamless implementation of these semantic HTML elements. Ultimately, adopting modern HTML solutions can transform web development projects without relying on complex JavaScript libraries.