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+---
+name: htmx
+description: |
+  htmx gives you access to AJAX, CSS transitions, WebSockets, and Server-Sent Events
+  directly in HTML using attributes. It enables dynamic web UIs without writing JavaScript
+  by letting any element issue HTTP requests and swap content into the DOM.
+license: Apache-2.0
+compatibility: 'any web server, html'
+metadata:
+  author: terminal-skills
+  version: 1.0.0
+  category: development
+  tags:
+    - html
+    - hypermedia
+    - ajax
+    - sse
+    - websocket
+    - no-javascript
+---
+
+# htmx
+
+htmx extends HTML with attributes like `hx-get`, `hx-post`, `hx-swap`, and `hx-trigger` to make any element capable of issuing HTTP requests and updating the DOM. The server returns HTML fragments, not JSON.
+
+## Installation
+
+```html
+<!-- index.html — add htmx via CDN or npm -->
+<script src="https://unpkg.com/htmx.org@2.0.4"></script>
+<!-- Or: npm install htmx.org -->
+```
+
+## Core Attributes
+
+```html
+<!-- templates/core-demo.html — fundamental htmx attributes -->
+
+<!-- GET request, replace inner HTML of target -->
+<button hx-get="/api/articles" hx-target="#article-list" hx-swap="innerHTML">
+  Load Articles
+</button>
+<div id="article-list"></div>
+
+<!-- POST form without page reload -->
+<form hx-post="/api/articles" hx-target="#article-list" hx-swap="afterbegin">
+  <input name="title" placeholder="Title" required />
+  <textarea name="body" placeholder="Body" required></textarea>
+  <button type="submit">Create</button>
+</form>
+
+<!-- DELETE with confirmation -->
+<button hx-delete="/api/articles/42" hx-confirm="Are you sure?" hx-target="closest article" hx-swap="outerHTML swap:500ms">
+  Delete
+</button>
+```
+
+## Swap Strategies
+
+```html
+<!-- templates/swap-strategies.html — different ways to insert content -->
+
+<!-- Replace inner content (default) -->
+<div hx-get="/fragment" hx-swap="innerHTML">Replace my contents</div>
+
+<!-- Replace entire element -->
+<div hx-get="/fragment" hx-swap="outerHTML">Replace me entirely</div>
+
+<!-- Append/prepend to list -->
+<div id="list">
+  <button hx-get="/more" hx-target="#list" hx-swap="beforeend">Load More</button>
+</div>
+
+<!-- Swap with transition delay -->
+<div hx-get="/fragment" hx-swap="innerHTML settle:300ms">With transition</div>
+
+<!-- Out-of-band swaps (update multiple elements) -->
+<!-- Server returns: -->
+<!-- <div id="notification" hx-swap-oob="innerHTML">New notification!</div> -->
+<!-- <div id="count" hx-swap-oob="innerHTML">43</div> -->
+```
+
+## Triggers
+
+```html
+<!-- templates/triggers.html — custom event triggers -->
+
+<!-- Trigger on input change with debounce -->
+<input type="search" name="q"
+  hx-get="/search"
+  hx-trigger="input changed delay:300ms"
+  hx-target="#results" />
+<div id="results"></div>
+
+<!-- Trigger on intersection (lazy loading) -->
+<div hx-get="/more-articles"
+  hx-trigger="intersect once"
+  hx-swap="afterend">
+  Loading...
+</div>
+
+<!-- Trigger on custom event -->
+<div hx-get="/notifications" hx-trigger="newMessage from:body">
+  Notifications
+</div>
+
+<!-- Polling -->
+<div hx-get="/api/status" hx-trigger="every 5s">
+  Status: checking...
+</div>
+```
+
+## Server Responses (Python/Django Example)
+
+```python
+# views.py — server returns HTML fragments, not JSON
+from django.shortcuts import render
+from django.http import HttpResponse
+
+def article_list(request):
+    articles = Article.objects.filter(published=True)[:20]
+    return render(request, "partials/article_list.html", {"articles": articles})
+
+def create_article(request):
+    form = ArticleForm(request.POST)
+    if form.is_valid():
+        article = form.save()
+        return render(request, "partials/article_card.html", {"article": article})
+    return render(request, "partials/article_form.html", {"form": form}, status=422)
+
+def delete_article(request, pk):
+    Article.objects.filter(pk=pk).delete()
+    return HttpResponse("")  # Empty response removes element with outerHTML swap
+```
+
+```html
+<!-- templates/partials/article_card.html — HTML fragment returned by server -->
+<article id="article-{{ article.id }}">
+  <h2>{{ article.title }}</h2>
+  <p>{{ article.body|truncatewords:30 }}</p>
+  <button hx-delete="/api/articles/{{ article.id }}"
+    hx-target="#article-{{ article.id }}"
+    hx-swap="outerHTML swap:300ms"
+    hx-confirm="Delete this article?">
+    Delete
+  </button>
+</article>
+```
+
+## Indicators
+
+```html
+<!-- templates/indicators.html — loading indicators -->
+
+<!-- Show spinner during request -->
+<button hx-get="/slow-endpoint" hx-indicator="#spinner">
+  Load Data
+</button>
+<span id="spinner" class="htmx-indicator">Loading...</span>
+
+<!-- CSS (htmx adds .htmx-request class during requests) -->
+<style>
+  .htmx-indicator { display: none; }
+  .htmx-request .htmx-indicator { display: inline; }
+  .htmx-request.htmx-indicator { display: inline; }
+</style>
+```
+
+## Headers and Request Config
+
+```html
+<!-- templates/request-config.html — request customization -->
+
+<!-- Include extra values -->
+<button hx-post="/api/vote" hx-vals='{"article_id": 42, "vote": "up"}'>
+  Upvote
+</button>
+
+<!-- Include values from other elements -->
+<input id="search-input" name="q" />
+<button hx-get="/search" hx-include="#search-input">Search</button>
+
+<!-- Push URL to browser history -->
+<a hx-get="/articles/my-article" hx-push-url="true" hx-target="#content">
+  My Article
+</a>
+```
+
+## Server-Sent Events
+
+```html
+<!-- templates/sse.html — real-time updates with SSE -->
+<div hx-ext="sse" sse-connect="/events/articles">
+  <div sse-swap="newArticle" hx-swap="afterbegin">
+    <!-- New articles appear here in real-time -->
+  </div>
+</div>
+```
+
+```python
+# views.py — SSE endpoint
+import json
+from django.http import StreamingHttpResponse
+
+def article_events(request):
+    def event_stream():
+        for article in listen_for_new_articles():
+            html = render_to_string("partials/article_card.html", {"article": article})
+            yield f"event: newArticle\ndata: {html}\n\n"
+    return StreamingHttpResponse(event_stream(), content_type="text/event-stream")
+```
+
+## WebSocket
+
+```html
+<!-- templates/ws.html — WebSocket integration -->
+<div hx-ext="ws" ws-connect="/ws/chat">
+  <div id="messages"></div>
+  <form ws-send>
+    <input name="message" placeholder="Type a message..." />
+    <button type="submit">Send</button>
+  </form>
+</div>
+```
+
+## Boosting (Progressive Enhancement)
+
+```html
+<!-- templates/boost.html — make regular links/forms use AJAX -->
+<body hx-boost="true">
+  <!-- All links and forms in this body now use AJAX -->
+  <nav>
+    <a href="/articles">Articles</a>  <!-- AJAX navigation -->
+    <a href="/about">About</a>
+  </nav>
+  <main id="content">
+    <!-- Content swapped here -->
+  </main>
+</body>
+```
+
+## Key Patterns
+
+- Server returns HTML fragments, not JSON — this is hypermedia, not REST
+- Use `hx-target` to control where responses are inserted; `hx-swap` controls how
+- Use `hx-trigger` with modifiers (`delay`, `throttle`, `changed`, `once`) for precise control
+- Use `hx-boost="true"` on `<body>` for easy progressive enhancement of existing sites
+- Use `hx-swap-oob` for updating multiple page sections from a single response
+- Use `hx-indicator` for loading states — htmx manages the CSS class automatically
+- Use `hx-push-url` to update browser URL for back-button support