Who is HTML Runner for?

HTML Runner is a consumer product built for learners, teachers, and web developers.

Yes — HTML Runner is free to use.

What platforms does HTML Runner run on?

HTML Runner runs on the web and embeddable surfaces.

Is HTML Runner still active?

Unverified. HTML Runner has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to HTML Runner?

Similar projects tracked by PulseGate include Script Runner, Try IT Yourself HTML5 editor, and Scripts Runner.

Who develops HTML Runner?

HTML Runner is developed by Mohammad Shaklain.

When did HTML Runner launch?

HTML Runner first shipped in 2026.

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HTML Runner

Name: HTML Runner
Author: Mohammad Shaklain

mozilla.orgBrowser DevTools & extensions

HTML Runner is a Firefox extension that provides an in-browser editor for HTML, CSS, and JavaScript with live iframe-based previews. It runs offline without dependencies or telemetry and is intended for learners, teachers, and developers testing code snippets.

FreeWebEmbeddableCloud-managed

Visit mozilla.org

Overview

8 features

In the Browser DevTools & extensions space, HTML Runner takes a focused approach. It focuses on testing HTML, CSS, and JavaScript snippets without setting up a server or build environment. HTML Runner is a consumer product aimed at learners, teachers, and web developers. HTML Runner costs nothing to use. HTML Runner is available on the web and embeddable surfaces.

Mohammad Shaklain builds and maintains HTML Runner, and it first shipped in 2026. Among its 8 catalogued features are HTML editor, CSS editor, and javaScript editor. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

HTML editor
CSS editor
JavaScript editor
Live preview
Light theme
Dark theme
Offline mode
No telemetry

Built with & integrations

Runs on

BrowserEmbeddableCloud-managed

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed13 Sep · 04:10 UTC
HTML Runner verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about HTML Runner

What is HTML Runner?: HTML Runner focuses on testing HTML, CSS, and JavaScript snippets without setting up a server or build environment. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is HTML Runner for?: HTML Runner is a consumer product built for learners, teachers, and web developers.
Is HTML Runner free?: Yes — HTML Runner is free to use.
What platforms does HTML Runner run on?: HTML Runner runs on the web and embeddable surfaces.
Is HTML Runner still active?: Unverified. HTML Runner has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to HTML Runner?: Similar projects tracked by PulseGate include Script Runner, Try IT Yourself HTML5 editor, and Scripts Runner.Script Runner Try IT Yourself HTML5 editor Scripts Runner
Who develops HTML Runner?: HTML Runner is developed by Mohammad Shaklain.
When did HTML Runner launch?: HTML Runner first shipped in 2026.

At a glance

Pricing: Free
Platforms: Web
First seen: 13 Sep 2026
Built for: learners, teachers, and web developers
Model: B2C
Solves: Testing HTML, CSS, and JavaScript snippets without setting up a server or build environment.

Registered as

Firefox Add-ons: html-runner

Developer

Mohammad Shaklain

Index record

Indexed: 13 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 13 Sep 2026

Identity audit (13)

Slug: html-runner-mozilla-org
Lifecycle state recorded: 13 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 13 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 13 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/html-runner

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