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Web pages often contain many links, but sometimes you want to target a specific one: the third link in a paragraph, the last link in a navigation list, or every fifth link in a dynamically generated feed. Native CSS provides :nth-child and :nth-of-type, but those selectors can be awkward when links are nested or when you want behavior beyond styling. nthlink addresses that gap: a small, focused library that makes selecting and working with the nth link straightforward. What nthlink does - Precise selection: choose links by position (nth, odd, even), by group (within a container), or by custom filtering (text, attribute). - Styling hooks: automatically apply classes to the selected links so you can style them with CSS. - Dynamic updates: re-evaluate positions when the DOM changes (useful for single-page apps and content loaded via AJAX). - Enhancements: automatic numbering, lazy-loading targets, and optional analytics event emission when selected links are clicked. - Accessibility-first: preserves keyboard focus order, supports ARIA attributes, and avoids interfering with assistive technology. Basic usage Include the tiny nthlink script and call its initializer: This example finds the third anchor inside #article, adds the class nthlink-highlight, inserts a visible ordinal (3) if number: true, and configures click tracking for analytics. Practical examples - Highlight the first external link on mobile to improve discoverability. - Number the top five links in a promotional card so users can reference them by number. - Attach lazy-loading behavior to every 10th link in a long list to defer heavy destinations until click. - Integrate with Google Analytics or a custom event bus to count clicks on "featured" links. Accessibility and performance nthlink avoids altering semantics: it doesn’t change hrefs, it doesn’t move nodes in the DOM, and it uses non-intrusive ARIA attributes to communicate enhancements. The library is built with minimal DOM queries, debounces mutation observers, and supports scoped selection to keep overhead negligible on large pages. Why use nthlink? It fills a practical niche: bridging the gap between CSS-based styling and JavaScript-driven behaviors for positional link selection. Whether you’re a front-end developer wanting consistent UI patterns or a marketer needing to highlight specific CTAs across dynamic content, nthlink provides a small, focused toolset to target and manage the nth link with confidence.