Is supportscss.dev Safe? Security Analysis for SupportsCSS / Stephanie Eckles
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SEQ SIA
Lastadijas 12 k-3, Riga, Latvia, LV-1050
Reg. No. 40203410806 • VAT LV40203410806
Support: guard@offseq.com • +371 2256 5353
AI Summary
SupportsCSS is a specialized open-source JavaScript library focused on detecting modern CSS feature support in browsers, enabling developers to apply progressive enhancement strategies effectively. The website serves as documentation, demo, and installation guide for the library, targeting front-end developers and web professionals. The site is authored by Stephanie Eckles, a recognized figure in the front-end development community, enhancing its credibility. 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. It integrates Plausible analytics for privacy-conscious user tracking. The site is well-structured, mobile-optimized, and accessible, with clear navigation and professional design. From a security perspective, the site does not expose forms or sensitive data, reducing attack surface. However, it lacks explicit security headers and formal privacy or cookie policies, which are recommended for compliance and trust. No WAF or blocking mechanisms are detected, and no suspicious content is present. Overall, the security posture is adequate but could be improved with standard best practices. The overall risk is low given the nature of the site as an informational and open-source project resource. Strategic recommendations include adding privacy and cookie policies, implementing security headers, and providing contact channels for security incidents to enhance trust and compliance.
Detected Technologies
12 urgent findings need attention
1 critical · 11 high
- + 4 more findings in the full report below
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Security drift alerts
Risk score drops, new high-severity issues, and header hardening gaps
Compliance watch
GDPR / NIS2 posture changes with governance evidence snapshots
Infrastructure surface
Unexpected open services, SSL expiry, DNS & email authentication changes
Content & tracker intelligence
Marketing tech shifts, analytics drift, and AI recommendation updates
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Security Headers
7 findings
30/100
GDPR Compliance
3 findings
50/100
NIS2 Compliance
9 findings
2/100
Email Security
5 findings
60/100
🧠AI Business Intelligence
Technology stack, business insights, and market analysis powered by AI.
Business Intelligence
Market & Strategic Analysis
SupportsCSS occupies a niche market within the web development ecosystem, providing advanced CSS feature detection beyond native CSS @supports capabilities. Its competitive advantage lies in its comprehensive test suite and ease of integration. The business model is community-driven open source with sponsorship and donation support. Target customers are front-end developers seeking cutting-edge CSS support detection. The project demonstrates growth potential through continuous updates and community engagement. Partnerships include GitHub and NPM for distribution, and Plausible for analytics. The author’s personal brand and related projects contribute to the ecosystem and credibility.
Security Posture Analysis
Comprehensive Security Assessment
The website demonstrates a moderate security maturity level appropriate for an informational open-source project. It avoids common vulnerabilities by not including forms or user input fields. However, the absence of security headers such as Content Security Policy, HSTS, and X-Frame-Options is a gap. There is no visible incident response or vulnerability disclosure policy, which could hinder timely handling of security issues. GDPR compliance is not explicitly addressed, and no privacy or cookie policies are present. The use of Plausible analytics indicates a privacy-conscious approach to user tracking. Overall, the security culture appears basic but responsible, with room for formalization and enhancement.
Strategic Recommendations
Priority Actions for Security Improvement
Implement and publish a comprehensive privacy policy and cookie policy to improve compliance and user trust.
✨Observations
AI-powered comprehensive website and business analysis.
AI-Enhanced Website Analysis
Business Insights
SupportsCSS / Stephanie Eckles
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 objects for easier progressive enhancement and feature detection beyond CSS @supports capabilities.
excellent
consistent
Technical Stack
fast
excellent
good
good
Security Assessment
- No forms or inputs detected
- No sensitive data exposure in HTML
Analytics & Tracking
Advertising & Marketing
Website Quality Assessment
Key Observations
Website is a technical documentation and demo site for SupportsCSS library.
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🛡️Security Headers
HTTP security headers analysis and recommendations.
Security Headers
HTTP security headers analysis
Missing X-Frame-Options header
HIGHPrevents clickjacking attacks
Missing X-Content-Type-Options header
MEDIUMPrevents MIME type sniffing
Missing Content-Security-Policy header
HIGHControls resources the browser is allowed to load
Missing X-XSS-Protection header
MEDIUMLegacy XSS protection (deprecated but still recommended)
Missing Referrer-Policy header
LOWControls referrer information sent with requests
Missing Permissions-Policy header
MEDIUMControls browser features and APIs
Sensitive data may be cached
LOWCache-Control header should include "no-store" for sensitive pages
👤GDPR Compliance
Privacy and data protection assessment under GDPR regulations.
GDPR Compliance
Privacy and data protection assessment
No Privacy Policy found
HIGHGDPR requires a clear and accessible privacy policy
No Cookie Policy found
HIGHGDPR requires clear information about cookie usage
No Cookie Consent Banner found
HIGHGDPR requires explicit consent for non-essential cookies
GDPR Compliance Analysis
🛡️NIS2 Compliance
Network & Information Security Directive compliance assessment.
NIS2 Compliance
Network & Information Security Directive
No information security framework found
HIGHNIS2 requires documented cybersecurity and information security measures
No vulnerability disclosure policy
MEDIUMNIS2 encourages coordinated vulnerability disclosure
No security policy documentation found
HIGHNIS2 requires documented cybersecurity governance and risk management
No incident response procedures found
HIGHNIS2 requires documented incident response and business continuity plans
No business continuity planning found
MEDIUMNIS2 emphasizes operational resilience and business continuity
No security contact information
HIGHNIS2 requires clear incident reporting channels
No vulnerability reporting mechanism
MEDIUMClear vulnerability reporting supports coordinated disclosure
No NIS2 reference found
LOWConsider explicitly mentioning NIS2 compliance efforts
Critical sector without clear security compliance
HIGHDetected sectors: transport
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📧Email Security
SPF, DKIM, and DMARC validation and email security assessment.
Email Security
SPF, DKIM, and DMARC validation
No DKIM record found
MEDIUMDKIM adds cryptographic signatures to emails
No BIMI Record
LOWBIMI displays brand logos in email clients
No MTA-STS Policy
MEDIUMMTA-STS enforces TLS for email delivery
No TLS-RPT Record
LOWTLS-RPT provides reporting for email TLS issues
No email authentication configured
CRITICALDomain is vulnerable to email spoofing
🏆SSL/TLS Security
Certificate validity and encryption analysis.
SSL/TLS Security
Certificate validity and encryption analysis
SSL Certificate Expires Within 90 Days
MEDIUMSSL certificate expires in 88 days
Weak SSL Key Length
HIGHSSL certificate uses 256-bit key, which is considered weak
Partial SSL/TLS Assessment
LOWCompleted 2 of 4 security checks due to time constraints
Certificate Details
OCSP Status
📊DNS Health
DNS configuration and security assessment.
DNS Health
DNS configuration and security assessment
DNSSEC Not Enabled
MEDIUMDNSSEC is not configured for this domain
CAA Records Not Configured
LOWCertificate Authority Authorization (CAA) records not found
No DMARC Record
MEDIUMDMARC policy not configured
DNS Records
DNSSEC Status
DNS Performance
⚡Network Security
Port scanning and network exposure analysis.
Network Security
Port scanning and network exposure analysis
Good Network Security Posture
LOWNo unnecessary services detected on common risky ports
How does supportscss.dev compare?
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🔧Technical Analysis
Detailed technical findings and analysis from AI assessment.
Technical Analysis
Comprehensive security assessment findings
Additional Findings
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PDF Report & Export
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Marketing Intelligence
Contact emails, phone numbers & warm leads
Plan Comparison
| Feature | PDF Report | Marketing+ |
|---|---|---|
| Full security analysis | ||
| Professional PDF export | ||
| Email delivery | ||
| Lifetime access + unlock code | ||
| Contact emails & phones | — | |
| Marketing outreach data | — |
Already purchased?
Order summary
Digital reports are delivered immediately after payment. By continuing you acknowledge the withdrawal waiver described in our Returns & Refunds policy.
Secure payments processed via EveryPay. Prices in EUR; Incl. 21% VAT.
SEQ SIA
Lastadijas 12 k-3, Riga, Latvia, LV-1050
Reg. No. 40203410806 • VAT LV40203410806
Support: guard@offseq.com • +371 2256 5353
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