# Look up HTML reference

> Provides a quick and easy way to look up HTML references on WhatWG and MDN reference, then copy the URL as markdown/HTML

Canonical page: [https://chrome-stats.com/d/look-up-html-reference](https://chrome-stats.com/d/look-up-html-reference)

## Overview

- **ID:** `look-up-html-reference`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Ian Lloyd
- **Category:** web-development
- **Daily users:** 1
- **Version:** 2.0.3
- **Last updated:** 2025-09-19
- **First published:** 2025-09-16
- **Size:** 32 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/look-up-html-reference/)
- **Website:** [https://a11y-tools.com/extensions-support/](https://a11y-tools.com/extensions-support/)

## Description

Includes:
- HTML elements
- HTML attributes
- ARIA-* attributes

Note that some attributes do not have an associated reference (as they are not written on MDN). I will update the tool as and when (or if) the relevant pages go live.

## Rankings

- #122,140 — Overall
- #25 — reference
- #144 — html

## Permissions and access

### Permissions

- `activeTab`
- `tabs`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [HTML Ref](https://chrome-stats.com/d/html_ref) — 1 users
- [MDN Docs](https://chrome-stats.com/d/mdn-docs) — 1 users
- [Web Dev Helper](https://chrome-stats.com/d/web-dev-helper)
- [HTML Search](https://chrome-stats.com/d/html-search) — 1 users
- [MDN Search](https://chrome-stats.com/d/mdn-search) — 182 users, 5.00 / 5
- [HTML to Markdown](https://chrome-stats.com/d/html-to-markdown) — 30 users
- [MDN Web API Referee](https://chrome-stats.com/d/mdn-web-api-referee) — 1 users, 3.00 / 5
- [Online Markdown Viewer with HTML Preview](https://chrome-stats.com/d/online-markdown-viewer) — 63 users, 5.00 / 5
- [HTML from MD](https://chrome-stats.com/d/html-from-md) — 5 users
- [MD Syntax](https://chrome-stats.com/d/md-syntax) — 6 users
- [Web Content MD Clipper](https://chrome-stats.com/d/web-content-md-clipper) — 3 users
- [Formatted Comparison Overlay](https://chrome-stats.com/d/formatted-comparison-overlay)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/look-up-html-reference)