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Marko – A declarative, HTML‑based language

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Nov 8, 2025 - 22:38
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Marko – A declarative, HTML‑based language
HTMLConciseJSTS

A declarative, HTML‑based language that makes building web apps fun.

Trusted

Powering high-traffic, production-grade websites like eBay.com

Familiar

If you know HTML, CSS, and JavaScript, you know Marko

Performant

Streaming, resumable, optimizing compiler, and a tiny runtime

Scalable

From simple HTML templates to powerful components as needed

HTML Re‑imagined

Marko is HTML re‑imagined as a language for building dynamic and reactive user interfaces.

Just about any valid HTML is valid Marko, but Marko extends the HTML language to allow building modern applications in a declarative way.Check it out!

// HTML + JavaScript = 💜
<let/count=0>
<button onClick() { count++ }>
  Clicked ${count} times
button>

// HTML + JavaScript = 💜
<let/count=0>
<button onClick() { count++ }>
  Clicked ${count} times
button>

// HTML + JavaScript = 💜
let/count=0
button onClick() { count++ }
  -- Clicked ${count} times

// HTML + JavaScript = 💜
let/count=0
button onClick() { count++ }
  -- Clicked ${count} times

Faster First Paint

Marko streams content to your users as soon as it's ready. No waiting for client side JavaScript bundles or data requests to start rendering.

HTML, assets, and images are loaded as soon as possible with asynchronous content loading in as it completes.Learn How

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Nintendo Switch 2 - $449.99
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Vibrant Joy-Con colors, in pristine condition! Stunning display and smooth gameplay, perfect for Super Mario Party Jamboree and more.
★★★★☆
Super Fun, Super Colorful! Wow, the screen is so bright and games like Super Mario Party Jamboree look amazing! The neon Joy-Cons are awesome and make it feel fresh.
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Nintendo Switch 2 - $449.99
Add to Cart
Vibrant Joy-Con colors, in pristine condition! Stunning display and smooth gameplay, perfect for Super Mario Party Jamboree and more.
★★★★☆
Super Fun, Super Colorful! Wow, the screen is so bright and games like Super Mario Party Jamboree look amazing! The neon Joy-Cons are awesome and make it feel fresh.
About
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streamed

Granular by Design

Why ship entire Islands for a few grains of sand? Marko ships only what's needed, skipping hydration and stripping unused code at the sub-template level.

Lean by default. Fast by design. Unrivaled performance on any device or network.Learn How

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iPhone 16 Pro - $999
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Vibrant Joy-Con colors, in pristine condition! Stunning display and smooth gameplay, perfect for Super Mario Party Jamboree and more.
★★★★☆
Awesome Phone, Awesome Photos! Just upgraded to the iPhone 16 Pro from my old iPhone 12, and it's like a whole new world! The Desert Titanium color looks super cool.
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full-page
All Products
BuyItNow
Cart (0)
iPhone 16 Pro - $999
Add to Cart
Vibrant Joy-Con colors, in pristine condition! Stunning display and smooth gameplay, perfect for Super Mario Party Jamboree and more.
★★★★☆
Awesome Phone, Awesome Photos! Just upgraded to the iPhone 16 Pro from my old iPhone 12, and it's like a whole new world! The Desert Titanium color looks super cool.
About
Security
Policies
Help
Sitemap
granular

Write Code, Right Code

Browsers and servers are built differently, shouldn't your code be too? Marko compiles your templates to perform their best with optimized, environment-specific output.

Faster loads. Smaller bundles. One seamless language.Learn How

Streamed HTML

for the server
<div>Hello ${name}div>
<div>Hello ${name}div>
div -- Hello ${name}
div -- Hello ${name}

Reactive DOM

for the browser

Types & Tooling

Marko has built-in TypeScript support , with strong type inference that works across templates and components. Editors get full language features like autocompletion, jump-to-definition, syntax highlighting, and clean formatting.

Build confidently. Catch errors early. Write better code, faster.Explore

<divBuilt in HTML 
 tag./$el
const $el: () => HTMLDivElement
>
  Hop in, we've got tags
div>

<scriptBuilt in core