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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 educational platform specializing in web development and programming tutorials. It offers a comprehensive range of free tutorials, references, exercises, and quizzes covering popular programming languages and web technologies such as HTML, CSS, JavaScript, Python, SQL, and more. The platform also provides paid certification exams and courses through its associated campus domain, positioning itself as a leader in accessible web education. Technically, the website employs modern web standards, including responsive design, Google Tag Manager for analytics, and Google reCAPTCHA for security. The site is well-structured with clear navigation and optimized for mobile devices, delivering an excellent user experience. Security-wise, the site enforces HTTPS and uses bot protection mechanisms, though explicit security headers and a public security policy are not evident. Privacy and cookie policies are present with consent mechanisms, indicating good compliance with GDPR. The absence of WHOIS data is noted but does not detract from the site's legitimacy given its strong brand presence and market position. Overall, W3Schools demonstrates a mature digital infrastructure with a strong focus on education, user experience, and privacy compliance.

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 operates in the education and technology sectors, targeting learners, students, and professionals seeking to improve their web development skills. Its business model combines free content with monetized certification exams and paid courses, creating diversified revenue streams. The platform enjoys a strong market position as a trusted resource for web tutorials, supported by a broad partnership ecosystem including campus and spaces subdomains. Its competitive advantage lies in comprehensive, easy-to-understand content and a user-friendly interface. Growth indicators include continuous content updates, expansion into data analytics and AI tutorials, and active social media engagement. Strategic observations highlight the importance of maintaining content quality and expanding certification offerings to sustain market leadership.

Security posture

W3Schools exhibits a solid security posture with mandatory HTTPS, use of Google reCAPTCHA to mitigate automated abuse, and no visible exposure of sensitive data. However, the lack of explicit security headers such as Content-Security-Policy and X-Frame-Options suggests room for improvement. There is no publicly available security policy or incident response information, which could enhance transparency and preparedness. Compliance with GDPR is supported by clear privacy and cookie policies with consent mechanisms. The absence of a vulnerability disclosure program or security.txt file limits external security collaboration. Overall, the security maturity is good but could benefit from formalized policies and enhanced header configurations.

Recommendations

  1. Implement and enforce comprehensive security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to strengthen browser security.
  2. Publish a dedicated security policy and incident response page to improve transparency and readiness.
  3. Establish a vulnerability disclosure program and provide a security.txt file to encourage responsible reporting.
  4. Enhance contact information availability, including security and general support emails and phone numbers.
  5. Regularly audit third-party scripts and dependencies to mitigate risks from external libraries.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
W3Schools
Description
W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many more.
Key services
Online tutorials, References, Exercises, Quizzes, Certification exams, Paid courses
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
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of Google reCAPTCHA for bot protection
  • No exposed sensitive data in HTML
  • Secure forms with input validation implied

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 WAF or security blocking detected
  3. WHOIS data unavailable, possibly due to registry or privacy protection
  4. Strong brand and market position in online education
  5. Good privacy and cookie policies with consent mechanisms
  6. No explicit contact emails or phone numbers found on main page
  7. Use of modern web technologies and fonts
  8. Presence of Google Tag Manager and reCAPTCHA for analytics and security
  9. No visible security.txt or vulnerability disclosure page
Technical notes

Notes

The website is built using modern web technologies including HTML5, CSS3, JavaScript, and the W3.CSS framework. It leverages Google Tag Manager for analytics and Google reCAPTCHA for bot protection. Fonts such as Source Sans Pro and FontAwesome icons are used for consistent branding and UI elements. The site is mobile-optimized with responsive design and preloaded fonts for performance. No CMS is explicitly detected, suggesting a custom or static site architecture. Hosting provider details are not evident from the HTML. Performance is fast with efficient resource loading. Accessibility features are present but could be further enhanced with ARIA roles and landmarks. SEO is supported by proper meta tags and Open Graph data. Overall, the technical infrastructure is robust and well-maintained.
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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