CSS Diagnostics icon

CSS Diagnostics

by scriptex · atanas.info · Accessibility
Established publisherManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

Highlight potentially invalid or erroneous HTML markup

Users
8
−1 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
1
0 in 30 days
Store rank
#207K
#173K among extensions
Version
1.1
updated 10 Aug 2026

Users

monthly, 3 years
11020Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 8 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
001Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 1 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 CSS Diagnostics

An extension for Google's Chrome browser which highlights potentially invalid and erroneous HTML markup. This extension uses a fork of the Holmes stylesheet which can be found on https://github.com/redroot/holmes.

Growth

WindowUsersChangeRatingsRating
7 days+2+33.3%00.00
30 days−1−11.1%00.00
6 months+2+33.3%00.00
1 year+4+100.0%00.00

Version history

2 versions recorded
1.110 Aug 2026
1.021 Apr 2019

Details

Category
Accessibility
First seen
21 Apr 2019
Size
46 KB
Languages
en
Pricing
Free
Support
github.com
Extension ID
peaeggimiceafdnmebnjlfljfnjngfkf

Permissions and risk

Moderate riskimpact 2, likelihood 2
Permissions
activeTabstoragecontextMenus

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