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W3C Validation installs statistics

By Umoxfo · VS Code Marketplace · Linters

Adds W3C validation support to Visual Studio Code.

View on VS Code Marketplace Fresh · Oct 18, 2026

W3C Validation has 137,043 recorded installs on VS Code Marketplace.

It ranks #1958 of 2,500 tracked VS Code Marketplace listings by installs.

It is rated 4.1 out of 5 from 10 ratings.

PluginStats has 3 daily observations since Oct 16, 2026; the latest is from Oct 18, 2026.

Installs
137,043
Official API · Oct 18, 2026
7-day growth
—
Insufficient history
30-day growth
—
Insufficient history
90-day growth
—
Insufficient history
Rank
#1958
Among tracked VS Code Marketplace listings

Rating: 4.10 / 5 from 10 ratings

About W3C Validation

VS Code W3C Validation extention

The extension to enable W3C validation support by the Nu Html Checker library.

Getting Started

This extention works using Java applications. You must have Java 8 or later on your local environment. If you don't have them installed, download and install a latest Java Development Kit (latest Java 8 is the minimum requirement).

After installing (or installed) the JDK, you would need to configure the Java execution path for your environment. Please restart the VS Code in order to load reliably the changed environment variables.

Then open your HTML document(s).

Setting the JDK

The path to the JDK requires to be set in the environment.

Set the JAVA_HOME environment variable:

For Windows:

1. Select Control Panel and then System. 1. Click Advanced and then Environment Variables. 1. Click New in the section System Variables 1. Enter the Variable name as JAVA_HOME and the Variable value as the installation path for the Java (e.g. C:\Program Files\Java\jdk-13). 1. Click OK 1. Find the PATH environment variable in the System Variables section and select it, click Edit. 1. Append ;%JAVA_HOME%\bin for the PATH variable 1. Click OK and also click OK

Disclaimer

After launching the VC code, it will take some time for the results to be displayed if the HTML is invalid.

Description from the VS Code Marketplace listing.

  • html

Where W3C Validation sits in the listing

Each band is one page of 20. Installs on a log scale. Placement is projected from installs, so it can differ from the marketplace's own sort order. Hover a dot to see the listing.

All VS Code Marketplace2,500 listings · 125 pages · page 98, #18 (overall #1958)
All VS Code Marketplace: every listing in installs order
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Linters252 listings · 13 pages · page 11, #7 (overall #207)
Linters: every listing in installs order
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Charts

Images: 30d · 1y · all time · 1600×900 dark

Adoption over time

W3C Validation installs on VS Code Marketplace, last 90 days: 137,043 installs as of Oct 18, 2026.W3C ValidationInstalls on VS Code Marketplace · Last 90 days137,043installs137K137K137K137K137K137KJul 20Aug 4Aug 19Sep 3Sep 18Oct 3Oct 18installsobservedarchived (Internet Archive)no observationsOct 16, 2026 – Oct 18, 2026 · 3 observations · Updated Oct…pluginstats.com
W3C Validation installs on VS Code Marketplace, last 90 days: 137,043 installs as of Oct 18, 2026.
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7/30/90-day growth

W3C Validation installs growth on VS Code Marketplace: 7-day growth unavailable, 30-day growth unavailable, 90-day growth unavailable.W3C ValidationInstalls growth on VS Code Marketplace137,043installs now7-day growthinsufficient historyInsufficient history30-day growthinsufficient historyInsufficient history90-day growthinsufficient historyInsufficient historyGrowth vs. nearest observation to each baseline date · Updated Oct 18, 2026pluginstats.com
W3C Validation installs growth on VS Code Marketplace: 7-day growth unavailable, 30-day growth unavailable, 90-day growth unavailable.
PNG SVG

Ranking history

W3C Validation VS Code Marketplace ranking history: currently #1958 (by installs).W3C ValidationVS Code Marketplace ranking · by installs · Last 90 days#1958current rank#1955#1956#1957#1958#1959#1960Jul 20Aug 4Aug 19Sep 3Sep 18Oct 3Oct 18rankOct 16, 2026 – Oct 18, 2026 · 3 observations · Updated Oct 18, 2026pluginstats.com
W3C Validation VS Code Marketplace ranking history: currently #1958 (by installs).
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Ratings over time

W3C Validation ratings on VS Code Marketplace, last 90 days: 10 ratings as of Oct 18, 2026.W3C ValidationRatings on VS Code Marketplace · Last 90 days10ratings99.51010.511Jul 20Aug 4Aug 19Sep 3Sep 18Oct 3Oct 18ratingsobservedarchived (Internet Archive)no observationsOct 16, 2026 – Oct 18, 2026 · 3 observations · Updated Oct…pluginstats.com
W3C Validation ratings on VS Code Marketplace, last 90 days: 10 ratings as of Oct 18, 2026.
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Filled points are observed values; hollow points come from Internet Archive snapshots of the listing page. Dashed segments span periods with no observations — values between points are not interpolated.

Recent observations

Full history (3)
Recent installs observations for W3C Validation
Date (UTC)InstallsChange vs. previous
137,043+3
137,040+2
137,038—

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Data source

Install counts, average rating, and rating counts come from the public Visual Studio Marketplace gallery API. Installs are cumulative and exclude updates.

Listing: https://marketplace.visualstudio.com/items?itemName=Umoxfo.vscode-w3cvalidation. First seen Oct 16, 2026; last successful collection Oct 18, 2026. See the methodology.