# BeaverCheck Audit Report — https://britishmuseum.org
**Date:** April 21, 2026
**URL:** https://britishmuseum.org
**Overall Grade:** C (76/100)
**Report:** https://beavercheck.com/results/3ffea837-753a-4cb1-b5da-f6064f20e626
## Top Findings
1. **[CRITICAL]** Content-Security-Policy header is missing — Security > Security Headers
2. **[CRITICAL]** No Content-Security-Policy header found — Security > Content Security Policy
3. **[CRITICAL]** Page weighs 16.0 MB (12.6 MB transferred) — Performance > Page Weight Budget
4. **[CRITICAL]** 6 button(s) with no accessible text — Accessibility > Link & Button Quality
5. **[WARNING]** 48 third-party resources (100% of weight) — Performance > Page Weight Inventory
---
## Lighthouse Scores
| Category | Score |
|----------|-------|
| Performance | 34 |
| Accessibility | 76 |
| Best Practices | 81 |
| SEO | 92 |
---
## Security
### Security Headers (F — 20/100)
*2 of 10 headers properly configured*
- **[WARNING]** HSTS max-age is too short (2592000s, should be ≥ 31536000s) — A short max-age leaves a window for downgrade attacks. Set max-age to at least 31536000 (1 year).
- **[WARNING]** X-Content-Type-Options header is missing — This header prevents MIME-type sniffing, which can lead to XSS attacks. Set it to 'nosniff'.
- **[WARNING]** X-Frame-Options header is missing — This header prevents clickjacking by controlling who can embed your page in a frame. Set it to DENY or SAMEORIGIN.
- **[WARNING]** Referrer-Policy header is missing — Controls how much referrer information is sent with requests. Set to 'strict-origin-when-cross-origin' or stricter.
- **[WARNING]** Permissions-Policy header is missing — Controls which browser features (camera, microphone, geolocation) are allowed. Set it to restrict unused features.
- **[CRITICAL]** Content-Security-Policy header is missing — CSP is the most important header for preventing XSS attacks. See the CSP section for detailed analysis.
- **[WARNING]** Cross-Origin-Opener-Policy header is missing — COOP isolates your browsing context, preventing cross-origin side-channel attacks. Set to 'same-origin'.
- **[WARNING]** Cross-Origin-Embedder-Policy header is missing — COEP prevents loading cross-origin resources without explicit permission. Required for SharedArrayBuffer and high-resolution timers.
- **[PASS]** X-Powered-By header is not present
- **[PASS]** Server header is present without version info
### Content Security Policy (F — 0/100)
*No enforcing CSP policy found*
- **[CRITICAL]** No Content-Security-Policy header found — CSP is the most effective defense against XSS attacks. Add a Content-Security-Policy header to restrict resource loading.
### TLS & Certificates (A+ — 100/100)
*TLS 1.3, 7 checks passed*
- **[PASS]** TLS 1.3 is used
- **[PASS]** Strong cipher suite is used
- **[INFO]** HTTP/2 is not negotiated — HTTP/2 provides multiplexing and header compression for better performance.
- **[PASS]** Certificate is valid (expires in 36 days)
- **[PASS]** Certificate chain has 3 certificates
- **[PASS]** Certificate uses modern signature algorithm
- **[PASS]** Certificate covers 2 domain(s)
- **[PASS]** Certificate is issued by a trusted CA
### Cookie Security (A+ — 100/100)
*No cookies set — no cookie security risks*
- **[PASS]** No cookies set — no cookie security risks
---
## Advanced Security
### Subresource Integrity (F — 20/100)
*0 of 9 external resources have SRI*
- **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from consent.cookiebot.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from consent.cookiebot.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from consent.cookiebot.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
### JS Library Vulnerabilities (A+ — 100/100)
*No known vulnerabilities*
- **[PASS]** No known JavaScript library vulnerabilities detected
### Information Leakage (A+ — 100/100)
*No exposures*
- **[INFO]** No security.txt found — Consider adding a security.txt at /.well-known/security.txt.
- **[PASS]** No sensitive files exposed
### Email Security (A — 85/100)
*DMARC: quarantine*
- **[PASS]** DMARC policy is quarantine — good protection
### Permissions-Policy (D — 40/100)
*No header set*
- **[WARNING]** No Permissions-Policy header — Consider adding a Permissions-Policy header to restrict browser feature access from embedded content.
### CORS Configuration (B — 80/100)
*No CORS headers*
- **[PASS]** No CORS headers present — secure default
---
## Performance
### Page Weight Budget (F — 0/100)
*12.6 MB transferred, 49 requests*
- **[CRITICAL]** Page weighs 16.0 MB (12.6 MB transferred)
- **[WARNING]** JavaScript is 1.5 MB — consider code splitting or lazy loading — Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
- **[PASS]** 49 HTTP requests
- **[INFO]** Estimated 2.6 g CO2 per page load
### Third-Party Impact (D — 50/100)
*100% third-party, 0 ms blocking*
- **[WARNING]** Third-party code accounts for 100% of page weight (12.6 MiB of 12.6 MiB)
- **[PASS]** Third-party blocking time is low (0 ms)
### Text Compression (A+ — 100/100)
*All text resources are compressed*
- **[PASS]** All text resources are compressed
### Image Optimization (B — 75/100)
*13 images, 0 KB saveable*
- **[PASS]** All images are well-optimized
### JS Execution Cost (F — 20/100)
*12543ms total JS execution*
- **[WARNING]** https://consent.cookiebot.com/uc.js: 7225ms CPU time
- **[WARNING]** https://www.britishmuseum.org/: 1140ms CPU time
- **[WARNING]** Unattributable: 861ms CPU time
- **[WARNING]** https://www.britishmuseum.org/sites/default/files/...: 684ms CPU time
- **[WARNING]** https://www.googletagmanager.com/gtm.js?id=GTM-MW5...: 635ms CPU time
- **[WARNING]** Third-party scripts: 12543ms (100% of total)
### Font Loading (A+ — 100/100)
*3 fonts (125 KB)*
- **[INFO]** 3 font(s) use font-display: swap (FOUT risk but functional)
### JS Bundles (F — 20/100)
*16 scripts, 574 KB unused*
- **[WARNING]** https://www.britishmuseum.org/sites/default/files/...: 75 KB unused (68%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://www.googletagmanager.com/gtm.js?id=GTM-MW5...: 74 KB unused (39%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://www.googletagmanager.com/gtag/destination?...: 66 KB unused (38%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://consent.cookiebot.com/Framework/IAB/consen...: 64 KB unused (73%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://www.googletagmanager.com/gtag/js?id=AW-869...: 64 KB unused (44%) — Consider code splitting or tree shaking to reduce unused code.
- **[INFO]** Total unused JavaScript: 574 KB
### Resource Caching (A+ — 100/100)
*All resources properly cached*
- **[PASS]** No caching issues found
### Critical Rendering Path (A+ — 100/100)
*No render-blocking resources*
- **[PASS]** No render-blocking resources detected
### Resource Hints (A+ — 100/100)
*3 hints, 0 missing preconnects*
- **[PASS]** Page uses 3 resource hint(s)
### Page Weight Inventory (F — 35/100)
*49 resources · 12.6 MB · 574 KB savings available*
- **[WARNING]** Page weight 11.6 MB over 1MB target
- **[INFO]** ~574 KB of savings available
- **[WARNING]** 48 third-party resources (100% of weight)
- **[INFO]** 2 resources over 200KB
### Render-Blocking Resources (A+ — 100/100)
*No render-blocking resources detected*
- **[PASS]** No render-blocking resources detected in
### Third-Party Resources (A+ — 100/100)
*No third-party resources detected*
---
## Content Quality
### Links (C — 70/100)
*200 links checked, 194 healthy, 6 broken*
- **[CRITICAL]** 194 of 200 links are healthy
- **[WARNING]** Broken link: https://googletagmanager.com — Found in . Returns HTTP 404.
- **[CRITICAL]** Broken link: https://www.accurat.ai/legal/privacy-centre — Found in . Returns HTTP 429.
- **[CRITICAL]** Broken link: https://www.accurat.ai/legal/legitimate-interest — Found in . Returns HTTP 429.
- **[CRITICAL]** Broken link: https://admaxmedia.io/privacy-policy/ — Found in . Get "https://admaxmedia.io/privacy-policy/": tls: failed to verify certificate: x509: certificate signed by unknown authority
- **[CRITICAL]** Broken link: https://adnuntius.com/resources/privacy-policy/ — Found in . Returns HTTP 404.
- **[CRITICAL]** Broken link: https://www.adzymic.ai/privacy — Found in . Returns HTTP 404.
### Mixed Content (A+ — 100/100)
*No mixed content detected — all resources use HTTPS.*
- **[PASS]** No mixed content detected — all resources use HTTPS
### Open Graph (F — 50/100)
*Open Graph tags need attention — social sharing previews may be incomplete.*
- **[WARNING]** Missing og:description — The og:description tag controls the description in social sharing previews.
- **[WARNING]** Missing og:image — The og:image tag provides a preview image for social sharing.
- **[INFO]** og:title is short (14 characters) — Ideal length is 25–60 characters for social sharing previews.
- **[INFO]** Missing og:url — The og:url tag specifies the canonical URL for the shared content.
- **[INFO]** Missing og:type — The og:type tag helps social platforms categorize the content.
- **[INFO]** Missing og:site_name — The og:site_name tag displays the website name in social previews.
- **[INFO]** Missing twitter:card — Without twitter:card, Twitter falls back to Open Graph tags. Adding it gives you more control.
### Structured Data (C — 75/100)
*1 JSON-LD block(s) found — some improvements recommended.*
- **[CRITICAL]** Malformed JSON-LD block #1 — JSON parse error: Mismatch type map[string]interface {} with value array "at index 0: mismatched type with value\n\n\t[]\n\t^.\n"
---
## Infrastructure
### DNS Records (A+ — 100/100)
*2 A records, 13 ms lookup*
- **[PASS]** Resolves to 2 IPv4 address(es)
- **[PASS]** Has 2 IPv6 (AAAA) record(s)
- **[PASS]** 2 nameserver(s) configured
- **[PASS]** 2 mail exchanger(s) configured
- **[INFO]** CAA records not checked — CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
- **[PASS]** SPF record present in TXT
- **[PASS]** DNS resolution time: 13 ms
### Redirect Chain (A — 90/100)
*1 redirect(s), 81 ms total*
- **[PASS]** Single redirect
- **[INFO]** WWW normalization redirect
### IPv6 Readiness (A+ — 100/100)
*IPv6 reachable (1 ms)*
- **[PASS]** IPv6 is configured and reachable at 2606:4700:10::ac42:acb1, 2606:4700:10::6814:2951
### Crawlability (A+ — 95/100)
*robots.txt present, sitemap with 1126 URLs*
- **[PASS]** robots.txt is present
- **[PASS]** sitemap.xml is present
- **[PASS]** sitemap.xml is valid XML
- **[PASS]** sitemap.xml contains 1126 entries
- **[INFO]** robots.txt does not reference a sitemap — Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
### URL Variants (B — 75/100)
*www/non-www, trailing slash, HTTP→HTTPS*
- **[CRITICAL]** Both www and non-www versions serve content
- **[PASS]** HTTP correctly 301-redirects to HTTPS
### Domain Intelligence
*Domain intelligence data not available*
---
## Compliance
### WCAG Compliance (A+ — 100/100)
*No testable criteria*
### Cookie Consent & Privacy (A+ — 100/100)
*CookieBot detected, privacy policy found*
- **[PASS]** Privacy policy link found
- **[PASS]** Terms of service link found
- **[PASS]** Consent banner detected (CookieBot)
- **[INFO]** This is an automated check, not legal advice — BeaverCheck detects technical indicators of consent management. This does not constitute a legal compliance assessment. Consult a privacy professional for GDPR/CCPA compliance.
### Language & i18n (A — 90/100)
*Lang attribute present*
- **[PASS]** attribute is present
- **[PASS]** value is valid
- **[INFO]** No Content-Language HTTP header
- **[INFO]** Language signals are inconsistent — The attribute and Content-Language header should agree.
### Readability & Typography (A+ — 100/100)
*Font sizes and tap targets checked*
### Viewport Configuration (A+ — 100/100)
*Viewport properly configured*
- **[PASS]** Viewport meta tag is present
- **[PASS]** width=device-width is set
- **[PASS]** User zooming is allowed
### Third-Party Trackers (A+ — 95/100)
*4 trackers detected*
- **[INFO]** 4 third-party trackers detected — Found 3 analytics, 0 advertising, 0 marketing, 1 tag manager trackers.
### Cookie & Tracker Inventory (A+ — 100/100)
*0 cookies · 4 trackers · 0 pre-consent*
- **[INFO]** 4 third-party tracker(s) detected on page
---
## Legal
### Legal Page Ecosystem (B — 80/100)
*4 of 7 expected legal pages detected*
- **[PASS]** Privacy Policy detected — Found at https://www.blackbaud.com/privacy-policy.aspx.
- **[PASS]** Terms of Service detected — Found at https://www.linkedin.com/legal/privacy-policy.
- **[PASS]** Cookie Policy detected — Found at https://www.britishmuseum.org/cookies.
- **[PASS]** Accessibility Statement detected — Found at /visit/accessibility-museum.
- **[INFO]** DMCA / Copyright Notice not detected — No link matching common DMCA / Copyright Notice URL patterns or link text was found. Most websites are expected to have a DMCA / Copyright Notice, especially those collecting user data.
- **[INFO]** Refund / Returns Policy not detected — No link matching common Refund / Returns Policy URL patterns or link text was found. Most websites are expected to have a Refund / Returns Policy, especially those collecting user data.
- **[INFO]** Acceptable Use Policy not detected — No link matching common Acceptable Use Policy URL patterns or link text was found. Most websites are expected to have a Acceptable Use Policy, especially those collecting user data.
### Copyright Notice (C — 55/100)
*No copyright notice detected*
- **[INFO]** No copyright notice detected — No copyright notice detected in the page content. While not legally required in most jurisdictions (copyright exists automatically), a notice is standard practice and signals site ownership.
### Regulatory Indicators
*3 regulatory indicator(s) detected*
- **[INFO]** This is a technical scan, not a legal assessment — BeaverCheck detects technical indicators that may suggest regulatory relevance. This is not a compliance audit and should not be relied upon for legal decisions. Consult qualified legal counsel for compliance assessments.
- **[INFO]** GDPR indicators detected (strong confidence) — Indicators suggesting GDPR may be relevant: Consent management platform detected: cookiebot.com; European TLD detected: .fr; Privacy policy page found. EU General Data Protection Regulation — governs collection and processing of personal data of EU residents.
- **[INFO]** ADA indicators detected (moderate confidence) — Indicators suggesting ADA may be relevant: Accessibility statement page found. Americans with Disabilities Act / Section 508 — requires digital accessibility for people with disabilities.
- **[INFO]** HIPAA indicators detected (weak confidence) — Indicators suggesting HIPAA may be relevant: Text mentions: phi. Health Insurance Portability and Accountability Act — protects sensitive patient health information.
### Third-Party Data Sharing
*2 third-party service(s) detected*
- **[INFO]** Data inventory for transparency purposes — This inventory identifies third-party services that receive data from your site visitors. Under regulations like GDPR (Article 30), maintaining records of data processing activities is commonly considered a best practice. This automated scan provides a starting point — it may not capture all data flows.
- **[INFO]** 2 third-party services across 2 categories — 2 third-party services detected across 2 categories: Analytics (1), Tag Management (1). Each of these services receives some user data from your site visitors.
- **[INFO]** Google Analytics (Analytics) — Detected via script URL. Typically collects: Page views, User behavior, Demographics, Device info, IP address. Privacy policy: https://policies.google.com/privacy. Data Processing Agreement available.
- **[INFO]** Google Tag Manager (Tag Management) — Detected via script URL. Typically collects: Orchestrates other tracking scripts, Page views. Privacy policy: https://policies.google.com/privacy. Data Processing Agreement available.
### Compliance Badges (B — 70/100)
*1 compliance badge(s) detected*
- **[PASS]** TRUSTe / TrustArc badge detected — Found via link URL: 'https://www.trustarc.com/privacy-policy/'. Note: the presence of a badge does not verify the certification is current or valid.
---
## Availability
### CDN & Delivery (B — 80/100)
*Cloudflare*
- **[PASS]** Site is served via Cloudflare CDN (edge: EWR)
### HTTP Caching (F — 30/100)
*No cache headers*
- **[WARNING]** No Cache-Control header found — Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
### Transport Security (A — 85/100)
*HTTP/3, HSTS, and TLS version analysis*
- **[PASS]** HTTP/3 (QUIC) supported — The server advertises HTTP/3 via Alt-Svc for faster connections on mobile networks.
- **[WARNING]** HSTS max-age is short: 30 days — HSTS max-age should be at least 1 year (31536000 seconds).
- **[INFO]** HSTS missing includeSubDomains — Without includeSubDomains, HSTS only protects the exact domain.
- **[PASS]** TLS 1.3 in use (fastest handshake, 1-RTT)
---
## Accessibility
### Landmark Structure (A — 85/100)
*10 landmarks*
- **[PASS]** landmark present
- **[PASS]** 4