htmx 4.0 swaps XMLHttpRequest for the fetch API, adds built-in morphing swaps that preserve DOM state, and ships under npm's next tag so current apps keep working.
Daniel Curtis covers what changed and why the maintainers made the upgrade opt-in.
🔗 Read more: https://www.infoq.com/news/2026/09/htmx-4-released/
htmx 4 has been released, featuring a transition from XMLHttpRequest to the fetch() API, enhancing streaming capabilities. Key updates include built-in morphing swaps for DOM state preservation and an hx-partial tag for cleaner updates. Attribute inheritance is now explicit, with event names standardized. The library maintains focus on minimal JavaScript while remaining popular among frameworks.
www.infoq.com
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