Observable, Inc. · Technology · N/a
Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 1 other check.
D3 by Observable is a mature and widely recognized JavaScript library specializing in bespoke data visualization. The website serves as the official documentation and gateway to the D3 ecosystem, including links to the Observable platform and GitHub repository. The business operates primarily in the technology sector, targeting developers and data professionals who require flexible and powerful visualization tools. The company behind D3 is Observable, Inc., founded in 2011, which also offers the Observable platform for collaborative data analysis. Technically, the website is built using modern web technologies including VitePress and JavaScript modules, hosted on Cloudflare infrastructure. The site demonstrates excellent design quality, mobile optimization, and accessibility, providing a fast and user-friendly experience. However, it lacks explicit privacy and cookie policies, and no contact information is directly provided on the site, which could be improved for better compliance and user trust. From a security perspective, the site enforces HTTPS and uses domain transfer protection, but it does not currently implement DNSSEC or security headers such as Content-Security-Policy. No vulnerabilities or exposed sensitive data were detected. The WHOIS data is consistent with the business claims, showing a long-established domain without privacy protection, enhancing trustworthiness. Overall, the website is professional, trustworthy, and technically sound but could benefit from enhanced privacy compliance and security best practices. Strategic recommendations include publishing privacy and cookie policies, enabling DNSSEC, adding security headers, and providing clear contact or incident response information.
Scanned
NIS2 Art. 21(2)
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.
7 findings rated critical or high. Fix these first.
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.
Forces HTTPS connections
What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"
Prevents clickjacking attacks
What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"
Controls resources the browser is allowed to load
What to do: Implement a Content-Security-Policy appropriate for your application
These are the privacy signals visitors and data protection authorities look for under GDPR.
GDPR requires a clear and accessible privacy policy
What to do: Add a comprehensive privacy policy page and link to it prominently
GDPR requires clear information about cookie usage
What to do: Add a dedicated cookie policy explaining cookie usage and purposes
GDPR requires explicit consent for non-essential cookies
What to do: Implement a cookie consent banner that appears on first visit
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Each check with its score, findings and the evidence it collected.
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
Not counted
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.
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
Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.
Leaked records that mention d3js.org, from OffSeq Breach.
1 subdomain affected
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Breach keeps ingesting new leaks, so these numbers can grow between scans.
Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.
Automated reading of the public site. Ratings are indicative.
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
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