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Carson Gross explains how a library declared “done” became htmx 4. After experimenting with Fetch in a tiny project called Fixie, Carson joined Christian Tanul and Michael West to rebuild htmx around modern asynchronous internals while keeping its established hypermedia model and familiar attributes largely compatible with htmx 2. The new release moves to Fetch, brings Idiomorph into core, makes attribute inheritance explicit, simplifies history handling, and adds an upgrade helper for existing applications. Carson also introduces hx-partial, hx-action, and hx-method, then surveys a stronger extension architecture covering preloading, optional history caching, Alpine compatibility, DOM-based HXLive reactivity, and streaming HTML through SSE, WebSockets, and multipart responses. The release will roll out gradually, with long-term support for earlier versions. Talk Title: htmx 4: what's new Speaker: Carson Gross Chapters: 0:00 Introduction and the Road to htmx 4 5:41 Compatibility and the Upgrade Helper 8:01 Fetch Internals and Idiomorph in Core 10:25 Explicit Attribute Inheritance 12:19 Simplified History and Optional Caching 14:13 Declarative Updates and hx-partial 17:41 hx-action, hx-method, and the HTML Spec 19:21 Extension Architecture, Preloading, and Client State 25:32 Streaming HTML, Release Strategy, and Recap https://bigskydevconf.com Key Highlights & Overview: Mastering <strong>Kursx Developer</strong> is essential for modern technical workflows and software skills. Follow along with top-rated video tutorials from industry experts today on <strong>TutorTube</strong>.