Kingsquare HTML Validator

A HTML5 validation library, using a JavaScript port of the excellent TIDY library

Kingsquare HTML Validator - Offline HTML5 Validation Library

Kingsquare HTML Validator is a Chrome extension that provides an offline HTML5 validation library. Using a JavaScript port of the exceptionally reputed TIDY library, it eliminates the requirement for remote services to validate your HTML(5). This is the first of its kind that allows HTML validation to go offline in Chrome.
Install from Chrome Web Store

Extension stats

Users: 1,000+
Rating: 2.86
(36)
Version: 1.4 (Last updated: 2012-08-28)
Creation date: 2012-08-28
Risk impact: Moderate risk impact
Risk likelihood:
Manifest version: 2
Permissions:
  • http://*/*
Size: 1.05M
URLs: Website

Other platforms

Not available on Android
Not available on Firefox
Not available on Edge
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Extension summary

This extension brings the the TIDY HTML Validation library to your browser. You will no longer need remote services to validate your HTML(5). This is the first offline HTML validator for Chrome.

For more information on the project, see http://www.kingsquare.nl/html-validator

** PLEASE NOTE **

Please restart your browser after installing the extension.

Open the development tools panel to activate the validator. Every page will get validated automatically, check the flag at the end of your address bar to see the current status. See the last tab of the development tools to get a full report.

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Incorporated into dev tools, which is great.
  • Works offline.
  • Provides validation by line number.
Cons
  • Does not effectively check or validate HTML content.
  • Errors and warnings can be spurious or misleading.
  • Output format is poor and lacks context around warnings and errors.
  • Struggles with UTF-8 encoded characters.
Most mentioned
  • Does not seem to check anything or produce useful information.
  • Horrible output format.
  • Issues with false warnings and errors.
  • Requires reloading pages to update validations.
User reviews
Might like it if I could get it to do something. Does not seem to check anything.
by Patrick Gallagher, 2019-02-28

Why does this module not qualified the display video's at the nu.nl?
by Lodewijk Abrahams, 2017-11-27

too finicky Should just show errors
by Paul Brown, 2016-06-23
View all user reviews

Extension safety

Risk impact

Kingsquare HTML Validator requires a few sensitive permissions. Exercise caution before installing.

Risk likelihood

Kingsquare HTML Validator is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this extension.

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Promo images

Kingsquare HTML Validator small promo image
Small promo image

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