# BeaverCheck Audit Report — https://dart.dev

**Date:** April 7, 2026  
**URL:** https://dart.dev  
**Overall Grade:** C (79/100)  
**Report:** https://beavercheck.com/results/89cab0b9-96f5-f58b-c45c-670a7c3a4f0f

## 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]** 1 link(s) with no accessible text — Accessibility > Link & Button Quality
4. **[CRITICAL]** No H1 heading found — Accessibility > Heading Hierarchy
5. **[WARNING]** Cross-Origin-Embedder-Policy header is missing — Security > Security Headers

---

## Lighthouse Scores

| Category | Score |
|----------|-------|
| Performance | 95 |
| Accessibility | 96 |
| Best Practices | 96 |
| SEO | 92 |

---

## Security

### Security Headers (C — 55/100)

*5 of 10 headers properly configured*

- **[WARNING]** HSTS is missing includeSubDomains — Without includeSubDomains, subdomains can still be accessed over HTTP.
- **[PASS]** X-Content-Type-Options is properly configured
- **[PASS]** X-Frame-Options is properly configured
- **[PASS]** Referrer-Policy is properly configured
- **[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 not present

### 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.
- **[INFO]** Content-Security-Policy-Report-Only is set but does not enforce — Report-Only logs violations but does not block them. Deploy an enforcing policy when ready.

### 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 57 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+ — 100/100)

*No cookies set — no cookie security risks*

- **[PASS]** No cookies set — no cookie security risks

---

## Advanced Security

### Subresource Integrity (D — 40/100)

*1 of 8 external resources have SRI*

- **[WARNING]** External link from fonts.googleapis.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from fonts.googleapis.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from fonts.googleapis.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code.
- **[WARNING]** External link from fonts.googleapis.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.google-analytics.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.
- **[PASS]** script from cdn.jsdelivr.net has SRI protection

### 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 (B — 82/100)

*1.1 MB transferred, 43 requests*

- **[PASS]** Page weighs 2.5 MB (1.1 MB transferred)
- **[INFO]** Fonts are 497 KB — consider subsetting or using system fonts — Subset fonts to include only used characters, or switch to system font stacks.
- **[PASS]** 43 HTTP requests
- **[INFO]** Estimated 0.23 g CO2 per page load

### Third-Party Impact (D — 50/100)

*72% third-party, 0 ms blocking*

- **[WARNING]** Third-party code accounts for 72% of page weight (813.0 KiB of 1.1 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 (C — 60/100)

*9 images, 0 KB saveable*

- **[WARNING]** https://dart.dev/assets/img/logo/dart-192.svg is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.
- **[WARNING]** https://dart.dev/assets/dash/svg/1-1-async-await.s... is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.
- **[WARNING]** https://dart.dev/assets/dash/svg/2-1-hot-reload-it... is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.
- **[WARNING]** https://dart.dev/assets/img/logo/logo-white-text.s... is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.
- **[WARNING]** https://dart.dev/assets/dash/2x/supported-by-googl... is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.
- **[WARNING]** https://dart.dev/assets/dash/svg/3-1-aot-compile.s... is missing width/height — may cause layout shift — Set explicit width and height to prevent CLS.

### JS Execution Cost (C — 60/100)

*1300ms total JS execution*

- **[WARNING]** https://dart.dev/: 461ms CPU time
- **[WARNING]** Unattributable: 297ms CPU time
- **[INFO]** https://www.googletagmanager.com/gtag/js?id=G-X5H2...: 188ms CPU time
- **[INFO]** https://dart.dev/main.client.mjs: 165ms CPU time
- **[INFO]** https://www.google-analytics.com/analytics.js: 96ms CPU time
- **[WARNING]** Third-party scripts: 674ms (52% of total)

### Font Loading (A+ — 100/100)

*3 fonts (497 KB)*

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

### JS Bundles (B — 80/100)

*6 scripts, 134 KB unused*

- **[WARNING]** https://www.googletagmanager.com/gtm.js?id=GTM-5VS...: 73 KB unused (55%) — Consider code splitting or tree shaking to reduce unused code.
- **[WARNING]** https://www.googletagmanager.com/gtag/js?id=G-X5H2...: 62 KB unused (41%) — Consider code splitting or tree shaking to reduce unused code.
- **[INFO]** Total unused JavaScript: 134 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)

### 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 (A — 90/100)

*196 links checked, 194 healthy, 2 broken*

- **[WARNING]** 194 of 196 links are healthy
- **[WARNING]** Broken link: https://fonts.googleapis.com — Found in <link href>. Returns HTTP 404.
- **[WARNING]** Broken link: https://fonts.gstatic.com — Found in <link href>. 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 (A — 90/100)

*Open Graph tags are well configured for social sharing.*

- **[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.

### 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 — 85/100)

*1 A records, 25 ms lookup*

- **[PASS]** Resolves to 1 IPv4 address(es)
- **[INFO]** Single A record — no DNS redundancy — Multiple A records provide failover if one server goes down.
- **[INFO]** No IPv6 (AAAA) records
- **[INFO]** No NS records found
- **[INFO]** No MX records — email not configured via DNS
- **[INFO]** CAA records not checked — CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
- **[INFO]** No SPF record found in TXT records — SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
- **[PASS]** DNS resolution time: 25 ms

### Redirect Chain (A+ — 100/100)

*No redirects — direct access*

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

### IPv6 Readiness (C — 60/100)

*No IPv6 support*

- **[INFO]** No IPv6 (AAAA) records found — IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

### Crawlability (A+ — 100/100)

*robots.txt present, sitemap with 1210 URLs*

- **[PASS]** robots.txt is present
- **[PASS]** sitemap.xml is present
- **[PASS]** sitemap.xml is valid XML
- **[PASS]** sitemap.xml contains 1210 entries
- **[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)

*dart.dev — via MarkMonitor Inc., 7 years, 4 months old, hosted on Fastly*

- **[PASS]** Domain registered until Jan 11, 2027 (9 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: MarkMonitor Inc.
- **[PASS]** Hosting: Fastly

---

## Compliance

### WCAG Compliance (A+ — 100/100)

*No testable criteria*


### Cookie Consent & Privacy (B — 80/100)

*No consent signals detected*

- **[WARNING]** No privacy policy link detected — A privacy policy page is recommended for transparency and may be legally required.
- **[INFO]** No terms of service link detected
- **[INFO]** No cookie consent banner detected
- **[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)

*3 trackers detected*

- **[INFO]** 3 third-party trackers detected — Found 2 analytics, 0 advertising, 0 marketing, 1 tag manager trackers.
- **[WARNING]** Trackers detected but no cookie policy found — This page loads 3 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.

---

## Legal

### Legal Page Ecosystem (C — 60/100)

*2 of 7 expected legal pages detected*

- **[PASS]** Privacy Policy detected — Found at https://policies.google.com/privacy, linked from footer.
- **[PASS]** Terms of Service detected — Found at /terms, linked from footer.
- **[INFO]** Cookie Policy not detected — No link matching common Cookie Policy URL patterns or link text was found. Most websites are expected to have a Cookie Policy, especially those collecting user data.
- **[INFO]** Accessibility Statement not detected — No link matching common Accessibility Statement URL patterns or link text was found. Most websites are expected to have a Accessibility Statement, especially those collecting user data.
- **[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

*1 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.

### 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 (C — 55/100)

*0 compliance badge(s) detected*

- **[INFO]** No compliance badges detected — No recognized compliance certification badges or seals were found. This is common — many sites do not display compliance badges.

---

## Availability

### CDN & Delivery (A — 85/100)

*Fastly (MISS)*

- **[PASS]** Site is served via Fastly CDN
- **[INFO]** CDN cache status: MISS

### HTTP Caching (A+ — 100/100)

*max-age=3600 (1 hour)*

- **[PASS]** Cache-Control header is set
- **[PASS]** Effective TTL: 1 hour (max-age=3600)
- **[PASS]** ETag present — enables conditional (304) responses
- **[PASS]** Last-Modified header present

### Transport Security (A+ — 100/100)

*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.
- **[PASS]** HSTS enabled (base policy)
- **[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)

*4 landmarks*

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

### Heading Hierarchy (B — 75/100)

*2 headings*

- **[CRITICAL]** No H1 heading found — Every page should have one H1 that describes the page content.

### Alt Text Quality (A+ — 100/100)

*All 17 images OK*

- **[PASS]** 17 image(s) with good alt text

### Form Accessibility (A+ — 100/100)

*All 2 controls labeled*

- **[PASS]** 2 control(s) properly labeled

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

*3 issue(s) across 200 links and 34 buttons*

- **[CRITICAL]** 1 link(s) with no accessible text — Links without text are announced as raw URLs by screen readers.
- **[WARNING]** 2 link(s) with generic text — Generic link text like 'click here' doesn't describe the destination.
- **[WARNING]** 14 link(s) open in new tab without warning — Add '(opens in new tab)' to link text or aria-label.
- **[PASS]** 183 link(s) with descriptive text

---

## UX

### 404 Error Page (A — 90/100)

*HTTP 404, custom page*

- **[PASS]** Correct 404 status code returned
- **[PASS]** Custom styled 404 page
- **[PASS]** Navigation links present on 404 page
- **[PASS]** Homepage link present on 404 page
- **[PASS]** Search form present on 404 page

### Favicon & Branding (C — 55/100)

*5 icon(s) detected*

- **[WARNING]** No favicon.ico at site root — Some older browsers, bookmark tools, and RSS readers look for /favicon.ico. Add one as a fallback.
- **[PASS]** HTML icon links detected
- **[PASS]** Apple touch icon present
- **[PASS]** Multiple icon sizes detected

### Web Manifest (D — 40/100)

*Not found*

- **[INFO]** No web manifest found — No manifest at standard paths (/manifest.json, /site.webmanifest). A manifest is optional but enables PWA features like home screen installation and standalone display.

### Dark Mode Support (B — 70/100)

*Dark mode detected*

- **[PASS]** prefers-color-scheme CSS detected in inline styles
- **[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 (F — 35/100)

*1 navigation pattern(s)*

- **[PASS]** Skip navigation 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 — 90/100)

*Title: 25 chars*

- **[PASS]** Page title is set
- **[WARNING]** Title is only 25 characters — consider expanding

### Content Depth (B — 80/100)

*724 words, Very Difficult*

- **[PASS]** Page has 724 words of content
- **[INFO]** Reading level: Very Difficult (grade 21)

### Internal Links (A+ — 100/100)

*170 internal, 30 external*

- **[PASS]** 170 internal links (85%)
- **[PASS]** 98% of links use descriptive anchor text
- **[INFO]** 170 internal / 30 external links

### Image SEO (A+ — 100/100)

*17 images, 17 descriptive filenames*

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

### Hreflang

*0 hreflang tags*


---

## Sustainability

### CO2 Per Page Load (A — 85/100)

*0.26g CO2 per view*

- **[PASS]** 0.26g CO2 per page view — This page transfers 1.1 MB, producing an estimated 0.26g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.20g.
- **[INFO]** At 10,000 monthly views: 31.5 kg CO2/year — With 10,000 page views per month, this page would generate approximately 31.5 kg of CO2 annually — equivalent to charging 3937 smartphones.
- **[PASS]** Green hosting reduces data center emissions

### Green Hosting (A — 85/100)

*Green (cdn)*

- **[PASS]** Fastly CDN uses renewable energy — Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
- **[INFO]** Fastly: 100% renewable energy for edge network
- **[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)

*99% cached*

- **[PASS]** 99% reduction on repeat visits — Returning visitors download only 11 KB (vs 1135 KB first visit). 42 of 43 resources are served from browser cache, saving 0.26g CO2 per repeat visit.
- **[INFO]** Repeat visit: 0.00g CO2 (first visit: 0.26g)

### Carbon Budget (A — 85/100)

*16th percentile*

- **[PASS]** 0.26g CO2 — below the sustainability target of 0.50g — Cleaner than an estimated 84% of websites analyzed. This page meets the Web Sustainability Guidelines target.
- **[INFO]** Estimated 16th percentile — Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

### Transfer Efficiency (B — 80/100)

*88% efficient*

- **[INFO]** Transfer efficiency: 88% — An estimated 134 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 134 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.

---

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*Generated by [BeaverCheck](https://beavercheck.com) — https://beavercheck.com/results/89cab0b9-96f5-f58b-c45c-670a7c3a4f0f*