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HTMX 4.0 Is Here - And There's No HTMX 3 (Here's Why)

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Did you hear that htmx 3.0 was just released? Here is the secret: htmx 3.0 doesn't exist! Creator Carson Gross promised there would never be a version 3, so he kept his word on a technicality and skipped straight to htmx 4.0—and it completely overhauls the framework by deleting 15KB of legacy code. šŸ”” Subscribe: https://www.youtube.com/channel/UC0DZj1PNa_Fp0MU6uPSKv5w?sub_confirmation=1 šŸ’™ Become a Member: https://www.youtube.com/channel/UC0DZj1PNa_Fp0MU6uPSKv5w/join 🐦 Twitter/X: https://x.com/cloud_codes šŸ’¬ Discord: https://discord.gg/4kJqEBMMf In this video, Cloud Codes breaks down the technical architectural changes inside htmx 4.0.0-beta6. We explore why XMLHttpRequest was completely excised from the codebase in favor of native fetch and async/await, shrinking the minified bundle size from 50KB down to 35.4KB. You will learn about the major breaking changes that will crash existing htmx 2 apps—including the end of implicit attribute inheritance, deleted DOM history caching, and mandatory 4xx/5xx error swapping—as well as brand-new core features like built-in Idiomorph DOM morphing, streaming SSE swaps, and the new hx-partial element. If this helped you understand web architecture, front-end performance, and modern framework design, subscribe to Cloud Codes for a new infrastructure breakdown every single week! Build, solve, deploy. ā±ļø Video Chapters: 0:00 - The htmx 3.0 Myth (Skipping to Version 4.0) 0:44 - The Fetch Engine: Goodbye XMLHttpRequest 1:21 - Why Carson Gross Rewrote the Internals (fixi.js) 2:36 - Breaking Change #1: Implicit Inheritance is Dead 4:07 - Breaking Change #2: 400 & 500 HTTP Errors Now Swap 5:28 - Event & Attribute Renames (24 Events Dead) 7:15 - History Caching Deleted (Back Button Behavior) 8:09 - New Features: Idiomorph, SSE, hx-partial & View Transitions 10:30 - Should You Upgrade? (The Migration Tool) 11:35 - Why Deleting Code Makes Better Frameworks šŸ”— Repositories & Sources Mentioned: • HTMX Essay ("The Fetchening"): https://htmx.org/essays/the-fetchening/ • HTMX Official Repository: https://github.com/bigskysoftware/htmx • Fixi.js (The HTMX 4 Prototype): https://github.com/bigskysoftware/fixi • Idiomorph (DOM Morphing Algorithm): https://github.com/bigskysoftware/idiomorph • HTMX Migration CLI Tool: npx [email protected] upgrade-check #htmx #javascript #webdevelopment #frontend #systemdesign #html #cloudcodes User Queries: htmx 3.0 what actually changed htmx 4.0 beta 6 fetch migration htmx 4 breaking changes carson gross htmx fetch vs xmlhttprequest performance htmx idiomorph dom morphing core htmx implicit inheritance disabled htmx 4 error swapping 400 500 status htmx upgrade tool npx htmx org why htmx skipped version 3 htmax js bundle explained cloud codes htmx breakdown

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