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Security report for supportscss.dev

SupportsCSS / Stephanie Eckles · Technology · N/a

Medium risk. 7 critical or high findings in Email security, Security headers and 2 other checks.

Security score

65/100

Risk levelMedium

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

SupportsCSS is a specialized open source project focused on providing live, in-browser detection of modern CSS features beyond the capabilities of the native @supports rule. The website serves as a documentation and distribution platform for the library, targeting front-end developers and web engineers who require precise CSS feature detection for progressive enhancement. The project is authored by Stephanie Eckles, a recognized figure in the front-end development community, and is supported by GitHub sponsorship and donation links. Technically, the website is built using the Eleventy static site generator and employs modern web standards including asynchronous JavaScript loading and font preloading for performance optimization. It integrates Plausible Analytics, a privacy-focused analytics service, indicating a moderate level of user tracking with respect to privacy. The site is mobile-optimized, accessible, and well-structured, providing a professional user experience. From a security perspective, the site does not expose forms or user input fields, reducing attack vectors. However, it lacks explicit security headers and published security policies such as privacy or cookie policies, which are recommended for compliance and trust. No vulnerability disclosure or incident response information is provided, which could be improved to enhance security posture. Overall, SupportsCSS presents a trustworthy and professional resource for its niche audience, with room for improvement in privacy compliance and security transparency. The domain appears legitimate with privacy protection typical for small open source projects. Strategic recommendations include publishing privacy and cookie policies, adding security headers, and providing clear contact channels for security incidents.

Scanned

This is an earlier scan of supportscss.dev. View the latest report

NIS2 and GDPR posture

GDPR outside view
50/ 100 · Medium
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

7 findings rated critical or high. Fix these first.

  1. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  2. 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 X-Frame-Options header

      Prevents clickjacking attacks

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

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  3. GDPR outside view

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

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

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

Keep watching supportscss.dev

This scan found 22 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.

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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
75
Security headers
30
Email security
60
DNS health
75
Network security
100
GDPR outside view
50
Average
65

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention supportscss.dev, from OffSeq Breach.

No leaked records found

Breach holds no records for supportscss.dev right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

Monitor on Breach (opens in a new tab)

Technical appendix

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

Business context

Business profile

SupportsCSS occupies a niche market segment within front-end web development tools, focusing on modern CSS feature detection. Its competitive advantage lies in extending feature detection beyond native CSS capabilities, inspired by the legacy of Modernizr. The business model is community-driven open source with sponsorship and donation support. The target customers are web developers seeking advanced CSS support detection for progressive enhancement. The project demonstrates growth potential through community engagement and ongoing maintenance. Partnerships are primarily through open source ecosystems and sponsorship platforms. The website content and structure reflect a focused and professional approach to serving its developer audience.

Security posture

The website exhibits a basic to moderate security maturity level. It benefits from minimal attack surface due to absence of forms and user inputs. However, the lack of security headers such as Content-Security-Policy and absence of published security policies represent compliance gaps. No incident response or vulnerability disclosure mechanisms are evident, limiting readiness for security events. Data protection practices are minimal but adequate given the limited data collection. Overall, the security culture appears informal, typical for small open source projects, with opportunities to enhance trust and compliance through documented policies and headers.

Recommendations

  1. Publish a comprehensive privacy policy and cookie policy to improve privacy compliance and user trust.
  2. Implement standard security headers (e.g., Content-Security-Policy, X-Frame-Options) to enhance protection against common web attacks.
  3. Establish and publicize a vulnerability disclosure policy or security.txt file to facilitate responsible security reporting.
  4. Provide explicit contact information for security incidents to improve incident response readiness.
  5. Regularly review and update dependencies and scripts to avoid potential vulnerabilities and maintain a secure tech stack.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
SupportsCSS / Stephanie Eckles
Description
SupportsCSS is a JavaScript library for live, in-browser detection of modern CSS support for selectors, features, and at-rules. It helps developers apply support-based classes and expose results for progressive enhancement and custom tests.
Key services
Feature detection for modern CSS selectors, properties, and at-rules, Support-based CSS class application, JavaScript API for querying CSS support, Custom test addition
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, CSS, HTML
Frameworks
Eleventy v3.0.0 (static site generator)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
70/100
Good practices seen
  • No forms or inputs detected, reducing attack surface
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Plausible Analytics
Tracking level
minimal
Privacy practices
basic

Advertising

Tracking pixels
plausible.io
Transparency
basic

Site quality

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

Key observations

  1. Website is a technical resource for CSS feature detection.
  2. No privacy, cookie, or terms of service policies found.
  3. No contact emails or phone numbers explicitly provided.
  4. Social media link to Mastodon profile of the author present.
  5. Uses modern static site generator Eleventy.
  6. Includes Plausible Analytics for privacy-friendly tracking.
  7. No forms or user input fields detected.
  8. No security headers or explicit security policies found in HTML.
  9. No vulnerability disclosure or security.txt found.
  10. No business registration or legal information present.
Technical notes

Notes

The website is built with modern web technologies including Eleventy static site generator, JavaScript modules, and CSS feature detection scripts. It uses font preloading and asynchronous script loading for performance optimization. The integration of Plausible Analytics reflects a privacy-conscious approach to user tracking. The site is mobile responsive and accessible, with clear navigation and structured content. No CMS or hosting provider is explicitly identified. The technical implementation is clean and efficient, with no visible technical debt or performance bottlenecks. Opportunities exist to enhance security headers and formalize privacy and security policies.
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. 65/100Medium31 findingsView report
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