Karthik Divi
·3 min read

HTMX Online Editor - Test HTML-Driven Interactivity in Your Browser

onecompileronline-compilerwebhtmx

HTMX has a simple premise: HTML should be able to do more without reaching for a JavaScript framework. You add a few attributes to your markup, and suddenly elements can make HTTP requests, swap content, and handle user interaction -- all without writing JS.

Testing that out should be just as simple. An HTMX online editor gives you exactly that.

What makes HTMX different

Most modern web development assumes you'll write a JavaScript application that happens to produce HTML. HTMX flips this. Your HTML is the application. You declare behavior with attributes like hx-get, hx-post, hx-swap, and hx-trigger, and HTMX handles the rest.

This is progressive enhancement in practice. Your page works without JS, and HTMX layers on interactivity where you need it. No virtual DOM. No build system. No npm install.

That philosophy maps perfectly to a browser-based editor. There's nothing to compile. You write HTML, include the HTMX script tag, and it works.

Example: a click-to-load pattern

Paste this into the HTMX playground on OneCompiler to see HTMX attributes in action:

<script src="https://unpkg.com/[email protected]"></script>

<style>
  body { font-family: system-ui, sans-serif; padding: 2rem; }
  .btn { padding: 0.5rem 1rem; background: #3b82f6; color: white;
         border: none; border-radius: 6px; cursor: pointer; font-size: 1rem; }
  .btn:hover { background: #2563eb; }
  #result { margin-top: 1rem; padding: 1rem; background: #f1f5f9;
            border-radius: 6px; min-height: 2rem; }
</style>

<h2>HTMX Attribute Demo</h2>

<button class="btn"
        hx-get="https://jsonplaceholder.typicode.com/posts/1"
        hx-target="#result"
        hx-swap="innerHTML"
        hx-indicator="#spinner">
  Load Post
</button>

<span id="spinner" class="htmx-indicator"> Loading...</span>

<div id="result">Click the button to fetch data.</div>

Three attributes on a button, and you've got an AJAX request with content swapping and a loading indicator. No fetch() calls. No addEventListener. Just HTML doing what HTML should have always been able to do.

When an online editor helps

HTMX is small enough that local setup is minimal -- include a script tag and you're done. But an online editor still wins in a few cases:

  • Trying HTMX for the first time. You can test drive the attribute system without touching your existing project.
  • Sharing examples. Explaining hx-swap="outerHTML" vs hx-swap="innerHTML" is easier with a live link than a code block in a chat message.
  • Quick experiments. Does hx-trigger="revealed" do what I think it does? Faster to test in a playground than to spin up a local server.
  • Teaching. HTMX is increasingly showing up in web development courses. A zero-setup environment removes the "how do I install this" questions.

OneCompiler's HTMX editor

OneCompiler gives you an HTML editor with live preview, which is all you really need for HTMX. Write your markup, add attributes, hit run, see the result. You can share your code via URL, which makes it easy to collaborate or ask for help.

No framework to install. No JS to write. Just HTML with superpowers.

Try it here: onecompiler.com/htmx