# BeaverCheck Audit Report — https://peerj.com

**Date:** April 22, 2026  
**URL:** https://peerj.com  
**Overall Grade:** C (74/100)  
**Report:** https://beavercheck.com/results/5ee920a8-d76f-4078-8dff-c35cf127d291

## 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]** 2 button(s) with no accessible text — Accessibility > Link & Button Quality
4. **[WARNING]** 45 third-party resources (90% of weight) — Performance > Page Weight Inventory
5. **[WARNING]** Cookie '__cf_bm' has no SameSite attribute — Security > Cookie Security

---

## Lighthouse Scores

| Category | Score |
|----------|-------|
| Performance | 44 |
| Accessibility | 100 |
| Best Practices | 96 |
| SEO | 100 |

---

## Security

### Security Headers (D — 40/100)

*4 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).
- **[PASS]** X-Content-Type-Options is properly configured
- **[PASS]** X-Frame-Options is properly configured
- **[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 72 days)
- **[PASS]** Certificate chain has 3 certificates
- **[PASS]** Certificate uses modern signature algorithm
- **[PASS]** Certificate covers 1 domain(s)
- **[PASS]** Certificate is issued by a trusted CA

### Cookie Security (A+ — 95/100)

*1 cookies analyzed, 2 checks passed*

- **[PASS]** Cookie '__cf_bm' has the Secure flag
- **[PASS]** Cookie '__cf_bm' has the HttpOnly flag
- **[WARNING]** Cookie '__cf_bm' has no SameSite attribute — Without an explicit SameSite attribute, browser default behavior varies. Set SameSite=Lax or Strict.

---

## Advanced Security

### Subresource Integrity (F — 20/100)

*0 of 32 external resources have SRI*

- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.mxpnl.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from transcend-cdn.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from transcend-cdn.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from pushpad.xyz lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External script from cdn.peerj.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 (D — 44/100)

*2.4 MB transferred, 59 requests*

- **[INFO]** Page weighs 6.6 MB (2.4 MB transferred)
- **[WARNING]** JavaScript is 1.2 MB — consider code splitting or lazy loading — Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
- **[INFO]** Fonts are 433 KB — consider subsetting or using system fonts — Subset fonts to include only used characters, or switch to system font stacks.
- **[INFO]** 59 HTTP requests
- **[INFO]** Estimated 0.51 g CO2 per page load

### Third-Party Impact (D — 50/100)

*90% third-party, 0 ms blocking*

- **[WARNING]** Third-party code accounts for 90% of page weight (2.2 MiB of 2.4 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 — 70/100)

*4 images, 0 KB saveable*

- **[WARNING]** https://peerj.com/assets/images/landing-pages/peer... is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.
- **[WARNING]** https://s3.amazonaws.com/static.peerj.com/images/j... is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.

### JS Execution Cost (D — 40/100)

*3465ms total JS execution*

- **[WARNING]** https://cdn.peerj.com/cb040aa/webpack/peerj-app.6c...: 858ms CPU time
- **[WARNING]** https://cdn.peerj.com/cb040aa/webpack/1042.5ccb850...: 604ms CPU time
- **[WARNING]** Unattributable: 338ms CPU time
- **[WARNING]** https://cdn.peerj.com/cb040aa/webpack/1009.ce1d475...: 324ms CPU time
- **[WARNING]** https://cdn.peerj.com/cb040aa/webpack/398.8481fb5e...: 297ms CPU time
- **[WARNING]** Third-party scripts: 3009ms (87% of total)

### Font Loading (A+ — 100/100)

*3 fonts (433 KB)*

- **[INFO]** 3 font(s) use font-display: swap (FOUT risk but functional)

### JS Bundles (F — 0/100)

*25 scripts, 684 KB unused*

- **[WARNING]** https://cdn.peerj.com/cb040aa/webpack/peerj-app.6c...: 469 KB unused (77%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://cdn.peerj.com/cb040aa/webpack/330.a5145fec...: 65 KB unused (49%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://peerj.com/js/8d39319-582a9a0.js: 50 KB unused (67%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://peerj.com/js/8d39319-582a9a0.js: unminified — 33 KB could be saved
- **[WARNING]** https://peerj.com/js/f67db00-8264f27.js: 46 KB unused (49%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://peerj.com/js/f67db00-8264f27.js: unminified — 45 KB could be saved
- **[WARNING]** https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88...: 28 KB unused (34%) — Consider code splitting or tree shaking to reduce unused code.
- **[INFO]** Total unused JavaScript: 684 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)

*6 hints, 0 missing preconnects*

- **[PASS]** Page uses 6 resource hint(s)

### Page Weight Inventory (F — 30/100)

*59 resources · 2.4 MB · 684 KB savings available*

- **[WARNING]** Page weight 1.4 MB over 1MB target
- **[INFO]** ~684 KB of savings available
- **[WARNING]** 45 third-party resources (90% of weight)
- **[INFO]** 3 resources over 200KB

### Render-Blocking Resources (A+ — 100/100)

*No render-blocking resources detected*

- **[PASS]** No render-blocking resources detected in <head>

### Third-Party Resources (A+ — 100/100)

*No third-party resources detected*


---

## Content Quality

### Links (F — 50/100)

*95 links checked, 85 healthy, 10 broken*

- **[CRITICAL]** 85 of 95 links are healthy
- **[CRITICAL]** Broken link: https://peerj.com/hubs — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/about/team — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/about/press — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/about/careers — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/new — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/pricing — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/accessibility — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/about/FAQ — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/about/contact — Found in <a href>. Returns HTTP 429.
- **[CRITICAL]** Broken link: https://peerj.com/about/terms/ — Found in <a href>. Returns HTTP 429.

### Mixed Content (B — 80/100)

*1 HTTP resource(s) loaded on HTTPS page*

- **[CRITICAL]** HTTP link loaded on HTTPS page — Modern browsers block or warn about HTTP resources on HTTPS pages. Change the URL to use HTTPS.

### Open Graph (F — 0/100)

*No Open Graph tags found — social sharing previews will be generic.*

- **[WARNING]** No Open Graph meta tags found — Without og:title, og:description, and og:image, social media platforms will generate a generic preview when your page is shared.

### Structured Data (C — 40/100)

*No structured data (JSON-LD) found.*

- **[INFO]** No structured data (JSON-LD) found — Adding structured data helps search engines understand your content and can enable rich results.

---

## Infrastructure

### DNS Records (A+ — 100/100)

*2 A records, 47 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: 47 ms

### Redirect Chain (A+ — 100/100)

*No redirects — direct access*

- **[PASS]** No redirects — direct access

### IPv6 Readiness (A+ — 100/100)

*IPv6 reachable (17 ms)*

- **[PASS]** IPv6 is configured and reachable at 2a06:98c1:3105::6812:27cb, 2a06:98c1:3103::ac40:9435

### Crawlability (A+ — 100/100)

*robots.txt present, sitemap with 2 URLs*

- **[PASS]** robots.txt is present
- **[PASS]** sitemap.xml is present
- **[PASS]** sitemap.xml is valid XML
- **[PASS]** sitemap.xml contains 2 entries
- **[PASS]** Sitemap index with 2 child sitemaps
- **[PASS]** robots.txt references sitemap

### URL Variants (A+ — 100/100)

*www/non-www, trailing slash, HTTP→HTTPS*

- **[PASS]** www/non-www redirect configured correctly (preferred: non-www)
- **[PASS]** HTTP correctly 301-redirects to HTTPS

### Domain Intelligence (A+ — 100/100)

*peerj.com — via Amazon Registrar, Inc., 14 years, 4 months old*

- **[PASS]** Domain registered until Feb 17, 2028 (1 years, 10 months remaining)
- **[INFO]** DNSSEC is not enabled — DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
- **[PASS]** Registrar: Amazon Registrar, Inc.
- **[WARNING]** Registrar lock is NOT enabled — The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

---

## Compliance

### WCAG Compliance (A+ — 100/100)

*No testable criteria*


### Cookie Consent & Privacy (A — 85/100)

*No consent signals detected*

- **[WARNING]** No privacy policy link detected — A privacy policy page is recommended for transparency and may be legally required.
- **[PASS]** Terms of service link found
- **[INFO]** No cookie consent banner detected
- **[PASS]** 1 cookie(s) set on initial load (functional)
- **[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]** <html lang> attribute is present
- **[PASS]** <html lang> value is valid
- **[INFO]** No Content-Language HTTP header
- **[INFO]** Language signals are inconsistent — The <html lang> 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 (C — 55/100)

*5 trackers detected*

- **[INFO]** 5 third-party trackers detected — Found 4 analytics, 0 advertising, 1 marketing, 0 tag manager trackers.
- **[WARNING]** Trackers detected but no cookie policy found — This page loads 5 trackers but no cookie policy was detected. GDPR requires disclosure when using tracking cookies.
- **[WARNING]** Trackers detected but no privacy policy found — Most data protection regulations require a privacy policy when collecting user data via trackers.

### Cookie & Tracker Inventory (A+ — 100/100)

*1 cookies · 5 trackers · 0 pre-consent*

- **[INFO]** 5 third-party tracker(s) detected on page

---

## Legal

### Legal Page Ecosystem (A — 85/100)

*4 of 7 expected legal pages detected*

- **[PASS]** Privacy Policy detected — Found at /about/privacy/, linked from footer.
- **[PASS]** Terms of Service detected — Found at /about/terms/, linked from footer.
- **[PASS]** Cookie Policy detected — Found at https://privacy.informa.com/policies/en/?name=informa-group-privacy-notice#cookies, linked from footer.
- **[PASS]** Accessibility Statement detected — Found at /accessibility, linked from footer.
- **[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 (A+ — 100/100)

*© 2026 PeerJ All rights reserved Privacy Policy | Terms o*

- **[PASS]** Copyright notice is up to date — Copyright notice is up to date: © 2026 PeerJ All rights reserved Privacy Policy | Terms o
- **[PASS]** Copyright holder: PeerJ

### Regulatory Indicators

*2 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 (moderate confidence) — Indicators suggesting GDPR may be relevant: 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.

### 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), CDN (1). Each of these services receives some user data from your site visitors.
- **[INFO]** Mixpanel (Analytics) — Detected via script URL. Typically collects: User events, Behavior analytics, Device info. Privacy policy: https://mixpanel.com/legal/privacy-policy/. Data Processing Agreement available.
- **[INFO]** Cloudflare (CDN) — Detected via cookie name. Typically collects: IP address (transient), Request metadata. Privacy policy: https://www.cloudflare.com/privacypolicy/. Data Processing Agreement available.

### Compliance Badges (B — 70/100)

*1 compliance badge(s) detected*

- **[PASS]** TRUSTe / TrustArc badge detected — Found via body text: 'truste'. Note: the presence of a badge does not verify the certification is current or valid.

---

## Availability

### CDN & Delivery (A — 85/100)

*Cloudflare (DYNAMIC)*

- **[PASS]** Site is served via Cloudflare CDN (edge: CDG)
- **[INFO]** CDN cache status: DYNAMIC

### HTTP Caching (B — 80/100)

*max-age=0, must-revalidate, proxy-revalidate, public, s-maxage=600*

- **[PASS]** Cache-Control header is set
- **[PASS]** CDN TTL: 10 minutes (s-maxage=600)
- **[PASS]** Last-Modified header present

### Transport Security (B — 75/100)

*HTTP/3, HSTS, and TLS version analysis*

- **[INFO]** HTTP/3 (QUIC) not advertised — HTTP/3 eliminates head-of-line blocking. If your CDN supports it, consider enabling it.
- **[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+ — 100/100)

*9 landmarks*

- **[PASS]** <main> landmark present
- **[PASS]** 1 <nav> landmark(s) found
- **[PASS]** Skip navigation link present

### Heading Hierarchy (A+ — 100/100)

*9 headings*

- **[PASS]** Single H1 present

### Alt Text Quality (A+ — 100/100)

*All 2 images OK*

- **[PASS]** 2 image(s) with good alt text

### Form Accessibility (A+ — 100/100)

*All 1 controls labeled*

- **[PASS]** 1 control(s) properly labeled

### Link & Button Quality (C — 68/100)

*2 issue(s) across 40 links and 19 buttons*

- **[WARNING]** 6 link(s) open in new tab without warning — Add '(opens in new tab)' to link text or aria-label.
- **[CRITICAL]** 2 button(s) with no accessible text — Icon-only buttons need an aria-label so screen readers can announce them.
- **[PASS]** 34 link(s) with descriptive text

---

## UX

### 404 Error Page (C — 55/100)

*HTTP 404, custom page*

- **[PASS]** Correct 404 status code returned
- **[PASS]** Custom styled 404 page

### Favicon & Branding (B — 80/100)

*21 icon(s) detected*

- **[PASS]** favicon.ico present at site root
- **[PASS]** HTML icon links detected
- **[PASS]** Apple touch icon present
- **[PASS]** Multiple icon sizes detected

### Web Manifest (D — 45/100)

*Valid manifest*

- **[PASS]** Name present: PeerJ
- **[PASS]** 192x192 icon present

### Dark Mode Support (D — 45/100)

*Theme color only*

- **[INFO]** Theme-color present but no dark variant — A theme-color is set but no dark-specific variant was found. The browser toolbar may not adapt for dark mode users.
- **[INFO]** No dark mode signals detected — Consider adding CSS with @media (prefers-color-scheme: dark) and <meta name='color-scheme' content='light dark'>.
- **[INFO]** Detection limited to meta tags and inline styles — External CSS files may contain prefers-color-scheme rules not visible to this scan.

### Print Stylesheet (D — 40/100)

*No print styles*

- **[INFO]** No print-specific styles detected — When users print this page, they get the screen layout including navigation and non-essential elements. Add @media print rules to hide navigation and optimize layout for paper.

### Navigation UX (D — 45/100)

*2 navigation pattern(s)*

- **[PASS]** Skip navigation link detected
- **[PASS]** Back-to-top link detected
- **[PASS]** 1 navigation landmark(s) detected
- **[PASS]** Hamburger menu detected (responsive design)

---

## SEO

### Canonical URL (B — 80/100)

*Minor issues*

- **[WARNING]** No canonical tag found — Search engines will determine the canonical URL themselves, which may cause duplicate content issues.

### Meta Tags (A — 85/100)

*Title: 4 chars*

- **[PASS]** Page title is set
- **[WARNING]** Title is only 4 characters — consider expanding
- **[INFO]** Title and H1 have very different wording — Alignment helps users confirm they've reached the right page.

### Content Depth (C — 65/100)

*538 words, Very Difficult*

- **[PASS]** Page has 538 words of content
- **[INFO]** Text-to-HTML ratio is 2% — Very low ratio suggests heavy framework overhead or boilerplate.
- **[INFO]** Reading level: Very Difficult (grade 15)

### Internal Links (A+ — 100/100)

*33 internal, 7 external*

- **[PASS]** 33 internal links (82%)
- **[PASS]** 100% of links use descriptive anchor text
- **[INFO]** 33 internal / 7 external links

### Image SEO (A+ — 100/100)

*2 images, 2 descriptive filenames*

- **[PASS]** All images have descriptive filenames

### Hreflang

*0 hreflang tags*


---

## Sustainability

### CO2 Per Page Load (B — 70/100)

*0.57g CO2 per view*

- **[INFO]** 0.57g CO2 per page view — This page transfers 2.4 MB, producing an estimated 0.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.44g.
- **[INFO]** At 10,000 monthly views: 68.5 kg CO2/year — With 10,000 page views per month, this page would generate approximately 68.5 kg of CO2 annually — equivalent to charging 8563 smartphones.
- **[PASS]** Green hosting reduces data center emissions

### Green Hosting (A+ — 100/100)

*Green (both)*

- **[PASS]** Both hosting and CDN use renewable energy
- **[INFO]** Cloudflare: Verified by the Green Web Foundation
- **[INFO]** Cloudflare: 100% renewable energy for global network since 2019
- **[INFO]** Green hosting status based on known provider commitments — Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.

### Repeat Visit Weight (A+ — 100/100)

*100% cached*

- **[PASS]** 100% reduction on repeat visits — Returning visitors download only 10 KB (vs 2469 KB first visit). 58 of 59 resources are served from browser cache, saving 0.57g CO2 per repeat visit.
- **[INFO]** Repeat visit: 0.00g CO2 (first visit: 0.57g)

### Carbon Budget (B — 70/100)

*47th percentile*

- **[INFO]** 0.57g CO2 — below the median website (0.60g) — Better than an estimated 53% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
- **[INFO]** Estimated 47th percentile — Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

### Transfer Efficiency (C — 60/100)

*72% efficient*

- **[WARNING]** Transfer efficiency: 72% — An estimated 684 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 684 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.

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*Generated by [BeaverCheck](https://beavercheck.com) — https://beavercheck.com/results/5ee920a8-d76f-4078-8dff-c35cf127d291*
