Networking

hx-sseStream updates via Server-Sent Events (SSE)	Stream updates via Server-Sent Events (SSE)
hx-wsEnable bidirectional connections over WebSockets (WS)	Enable bidirectional connections over WebSockets (WS)

Performance

hx-preloadPreload content on hover for instant page loads	Preload content on hover for instant page loads
hx-ptagSkip swaps when polled content hasn't changed	Skip swaps when polled content hasn't changed
hx-history-cacheCache pages in sessionStorage for instant back/forward	Cache pages in sessionStorage for instant back/forward

UX

hx-optimisticApply optimistic UI updates before the server responds	Apply optimistic UI updates before the server responds
hx-downloadSave responses as file downloads with progress events	Save responses as file downloads with progress events
hx-browser-indicatorShow the browser's native loading indicator	Show the browser's native loading indicator
hx-liveAdd lightweight reactivity backed by the DOM	Add lightweight reactivity backed by the DOM
hx-promptPrompt before a request, send the answer as a header	Prompt before a request, send the answer as a header

Swap behaviors

hx-headMerge head tags (styles, scripts) into htmx responses	Merge head tags (styles, scripts) into htmx responses
hx-upsertUpdate or insert elements by ID for dynamic lists	Update or insert elements by ID for dynamic lists
hx-targetsSwap one response into multiple elements at once	Swap one response into multiple elements at once

Compatibility

htmx-2-compatRestore htmx 2.x defaults and event names on htmx 4	Restore htmx 2.x defaults and event names on htmx 4
hx-alpine-compatRun htmx alongside Alpine.js without conflicts	Run htmx alongside Alpine.js without conflicts

Security

hx-cspMake htmx work under strict Content Security Policy

Make htmx work under strict Content Security Policy