MarkupLint

Unknown author · Tools

Open in Chrome Web Store

Users

Avg rating

—

Ratings

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Updated

Oct 29, 2025

Media

1 item

Description

Instant HTML validation for web developers. Check markup quality offline by AIO.com.ai MarkupLint is a powerful HTML validation extension for web developers and designers. Instantly analyze any webpage's HTML structure, accessibility, and semantic markup quality without leaving your browser. Press Alt+Shift+V or click the toolbar icon to validate the current page. Results appear in the browser console with color-coded issues, warnings, and suggestions. Features include DOCTYPE validation, heading hierarchy checks, accessibility audits, duplicate ID detection, and semantic HTML5 verification. Works 100% offline with no external requests. Perfect for debugging, learning web standards, and ensuring clean, valid HTML markup. Developed by AIO.com.aiRetry

History

30d 90d 1y all

rating_count is the Chrome Web Store ratings count, not a written-review count.

Details & SEO

SEO signals

Listing completeness signals

Title length
Characters in the extension name.
10
Description length
Characters in the listing description.
760
Media assets
Screenshots and videos on the listing.
1
Has promo video
Whether the listing includes at least one video.
No
Languages
Declared language locales.
8
Developer website
Listing exposes a developer website URL.
No
Contact email
Listing exposes a contact email.
Yes
Keyword in name
Case-insensitive substring match in the name.
—
Keyword in description
Case-insensitive substring match in the description.
—
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
—
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
10.5

These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.