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htmx 4.0 is under construction — migration guide

Documentation

Get Started

Installation
Migration

Core Concepts

Mental Model
Hypermedia Controls
Requests & Responses
Client-Side Scripting
Multi-Target Updates

Features

CSS Transitions
Synchronization
Confirmations
Boosting
History
Validation
Web Components
Attribute Inheritance
Extended Selectors

Extensions

Using Extensions
Extension Migration
Server-Sent Events (SSE)
WebSockets
Head Support
Preload
htmx 2.x Compatibility
Optimistic UI
Download
Upsert
Targets
PTag
Browser Indicator
Alpine.js Compatibility
History Cache

Security

Best Practices
Caching

Troubleshoot

Debugging
Configuration

Editor Support

VS Code

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Extensions

Extensions

Extend htmx with SSE, WebSockets, head support, and more

Using Extensions Install, configure, and build htmx extensions. Extension Migration Migrate extensions from htmx 2.x to htmx 4.x. Server-Sent Events (SSE) Stream server updates using Server-Sent Events WebSockets Enable bidirectional real-time communication via WebSockets Head Support Merge head tag information (styles, scripts) in htmx responses Preload Preload content on hover or other events for near-instant page loads htmx 2.x Compatibility Compatibility layer for running htmx 2.x code on htmx 4 Optimistic UI Optimistic UI updates that apply changes before the server responds Download Save responses as file downloads with streaming progress. Upsert Update-or-insert swap strategy for dynamic lists Targets Swap the same response into multiple elements matching a CSS selector. PTag Per-element polling tags that let the server skip swaps when content hasn't changed. Browser Indicator Show the browser's native loading indicator during htmx requests Alpine.js Compatibility Compatibility layer for using htmx with Alpine.js History Cache Client-side history cache in sessionStorage — restores pages instantly on back/forward navigation without a network request

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