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Security report for w3schools.com

W3Schools · Education · N/a

Low risk. 3 critical or high findings in Security headers and GDPR outside view.

Security score

78/100

Risk levelLow

0–100, higher is better. How it is calculated

W3Schools is a globally recognized online education platform specializing in web development tutorials, references, and exercises. It offers a comprehensive range of free learning materials covering popular programming languages and web technologies, complemented by paid certification exams and courses. The platform targets web developers, students, and educators seeking accessible and well-structured learning resources. Technically, W3Schools employs modern web standards including HTML5, CSS3, JavaScript, and integrates Google Tag Manager and reCAPTCHA for analytics and security. The site is well-optimized for performance, mobile responsiveness, and accessibility, providing an excellent user experience. Security posture is strong with HTTPS enforcement and multiple security headers, although explicit security policies and incident response contacts are not publicly detailed. Privacy and cookie policies are comprehensive and GDPR compliant, reflecting good privacy practices. The absence of WHOIS data suggests privacy protection but does not detract significantly from the site's legitimacy given its established brand and content quality. Overall, W3Schools presents a mature, professional, and trustworthy educational resource with minor areas for enhanced transparency in security disclosures.

Scanned

This is an earlier scan of w3schools.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
80/ 100 · Low
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

3 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

Need hands-on remediation? Email guard@offseq.com

Keep watching w3schools.com

This scan found 19 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
95
Security headers
30
Email security
80
DNS health
85
Network security
100
GDPR outside view
80
Average
78

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

W3Schools holds a leading position in the online education sector for web development, leveraging a freemium business model that combines free tutorials with paid certifications and courses. Its extensive tutorial catalog and certification programs create multiple revenue streams. The platform's target audience includes individual learners, educators, and professionals seeking skill development. W3Schools maintains a strong partnership ecosystem with related domains handling certifications, payments, and user profiles. The brand's consistent design and active social media presence reinforce its market credibility. Growth indicators include continuous content updates and expansion into emerging technologies like AI and data science. Strategic observations highlight the importance of maintaining transparency in domain registration and enhancing security communication to sustain trust.

Security posture

The website demonstrates a high level of security maturity with enforced HTTPS, robust security headers, and integration of Google reCAPTCHA to mitigate automated abuse. No vulnerabilities or exposed sensitive data were detected in the analyzed content. However, the absence of a public security policy, incident response information, and vulnerability disclosure program represents a compliance gap. These omissions could impact incident handling efficiency and stakeholder trust. The platform complies with GDPR through clear privacy and cookie policies, but explicit security contact channels are lacking. Overall, the security posture is strong but could benefit from improved transparency and formalized security governance documentation.

Recommendations

  1. Publish a dedicated security policy and incident response plan accessible on the website.
  2. Implement and publicize a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  3. Provide clear security contact channels such as security@ or abuse@ email addresses.
  4. Enhance transparency around domain registration details to improve trustworthiness.
  5. Continue regular security audits and update privacy compliance measures in line with evolving regulations.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
W3Schools
Description
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Key services
Free online tutorials, References and exercises, Certification exams, Paid courses, Code editor and learning tools
Content quality
excellent
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, Google Tag Manager, Google reCAPTCHA, FontAwesome, Source Sans Pro font, W3.CSS framework
Frameworks
W3.CSS
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of Google reCAPTCHA
  • Content Security Policy
  • Secure cookies and session management

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Snigel AdConsent
Tracking pixels
Google reCAPTCHA
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with rich content and navigation.
  2. No signs of blocking or WAF challenges.
  3. Strong branding and consistent design.
  4. Comprehensive educational content with many tutorials and certifications.
  5. No direct contact emails or phone numbers found on main page.
  6. Privacy and cookie policies are present and comprehensive.
  7. Security headers and HTTPS are properly implemented.
  8. Use of modern web technologies and fonts.
  9. Multiple social media channels linked.
  10. WHOIS data unavailable, possibly due to privacy protection.
Technical notes

Notes

W3Schools utilizes a modern and efficient technology stack including HTML5, CSS3, JavaScript, and the W3.CSS framework, ensuring fast loading times and excellent mobile optimization. The site employs Google Tag Manager for analytics and integrates Google reCAPTCHA for security. Fonts like Source Sans Pro and FontAwesome icons enhance visual appeal and usability. The platform's navigation is clear and well-structured, supporting a positive user experience. No CMS or hosting provider details were explicitly identified, but the infrastructure appears robust and scalable. Opportunities exist to improve technical documentation around security and compliance to reduce technical debt and enhance operational transparency.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

Earlier scans of this domain

  1. 78/100Low25 findingsView report
  2. 78/100Low25 findingsView report
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