Tailwind CSS underline Class

The Tailwind CSS underline utility applies text-decoration-line: underline; to an element when added to its class attribute. It adds an underline beneath the text. Used for emphasizing text, indicating links, or styling text decorations.

This utility is part of Tailwind's Typography module, designed for styling text with appropriate sizes, weights, spacing, alignment, and decorations. In Tailwind's utility-first workflow, you add underline directly to your HTML elements rather than writing custom CSS. This approach accelerates development and keeps styles co-located with your markup, making it easy to see exactly how each element is styled at a glance.

Common responsive variants include sm:underline, md:underline, lg:underline, and xl:underline, allowing different behavior at each breakpoint. State variants like hover:underline and focus:underline enable interactive styling without any JavaScript. You can also combine multiple variants for fine-grained control over when the utility applies.

This class works well alongside `no-underline`, `line-through`, `italic`, `font-bold` to build complete, production-ready interfaces. Tailwind's tree-shaking ensures only utilities you actually use appear in your final CSS bundle, keeping file sizes minimal. Browser support for the underlying CSS is excellent across Chrome, Firefox, Safari, and Edge.