W3C_CSS_Validator

What is W3C_CSS_Validator?

About

W3C_CSS_Validator is a developer helper operated by W3C. If you think this is incorrect or can provide additional detail about its purpose, please contact us. You can see how often W3C_CSS_Validator visits your website by setting up Dark Visitors Agent Analytics.

Expected Behavior

Developer helpers generally visit websites on direct behalf of a user who is evaluating some feature or attribute. Visits can be one-off or part of a larger crawl.

Type

Developer Helper
Used by developers to test website functionality

Detail

Operated By W3C
Last Updated 7 hours ago

Insights

Top Website Robots.txts

0%
0% of top websites are blocking W3C_CSS_Validator
Learn How →

Country of Origin

United States
W3C_CSS_Validator normally visits from the United States

Global Traffic

See All Global Bot & LLM Insights →

The percentage of all internet traffic coming from Developer Helpers

How Do I Get These Insights for My Website?
Use the WordPress plugin, Node.js package, or API to get started in seconds.
Set Up Agent Analytics

Robots.txt

Should I Block W3C_CSS_Validator?

Probably not. Developer helpers are normally used to optimize or find problems with your website.

How Do I Block W3C_CSS_Validator?

You can block W3C_CSS_Validator or limit its access by setting user agent token rules in your website's robots.txt. Set up Dark Visitors Agent Analytics to check whether it's actually following them.

How Do I Block All Developer Helpers?
Serve a continuously updating robots.txt that blocks new developer helpers automatically.
Set Up Automatic Robots.txt
User Agent String Jigsaw/2.2.5 W3C_CSS_Validator_JFouffa/2.0 
# In your robots.txt ...

User-agent: W3C_CSS_Validator # https://darkvisitors.com/agents/w3c-css-validator
Disallow: /

⚠️ Manual Robots.txt Editing Is Not Scalable

New agents are created every day. We recommend setting up Dark Visitors Automatic Robots.txt if you want to block all agents of this type.