September 18, 2026•1 min read•from InfoQ

htmx 4.0: a Fetch-Based Rewrite, Built-In Morphing Swaps, and Explicit Attribute Inheritance

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.

By Daniel Curtis

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Tagged with

#htmx

#fetch API

#XMLHttpRequest

#morphing swaps

#streaming

#attribute inheritance

#DOM state

#hx-partial

#minimal JavaScript

#event names

#frameworks

#DOM

#API

#updates

#library

#transitions

#explicit

#standardized

#version 4

#Daniel Curtis