W3C Validator Errors icon

W3C Validator Errors

by Joseph Michel · Developer Tools
Manifest V3 Free
View in Chrome Web Store Data as of 16 Oct 2026

Checking the web page HTML validity using the validator.w3.org validation api

Users
32
−10 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#128K
#107K among extensions
Version
1.0
updated 21 May 2025

Users

monthly, 17 months
02040May 2025Feb 2026Oct 2026
Latest, 16 Oct 2026: 32 usersMove the mouse over the chart for any month

Ratings count

monthly, 17 months
001May 2025Feb 2026Oct 2026
Latest, 16 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About W3C Validator Errors

Checking the web page HTML validity using the validator.w3.org validation api, Html validity is essential for web accessibility.

Growth

WindowUsersChangeRatingsRating
7 days−4−11.1%00.00
30 days−10−23.8%00.00
6 months−1−3.0%00.00
1 year+14+77.8%00.00

Version history

1 versions recorded
1.021 May 2025

Details

Category
Developer Tools
First seen
21 May 2025
Size
18 KB
Languages
en
Pricing
Free
Extension ID
ckhaiajkibbcblhelfjkopeihmaiobhp

Permissions and risk

Low riskimpact 1, likelihood 2
Permissions
scriptingactiveTab
Site access
https://validator.w3.org/*

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