polyfill-fastly.io
Fastly Polyfill
Last scanned Jul 25, 2026, 10:25 PM · 1 view
Overall score
Great
Summary
Fastly Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser. This website is hosted on Fastly. SEO is good (75/100) and accessibility is fair (70/100). Security scores good (80/100) and performance excellent (100/100). Top issue: Missing canonical link.
Fastly Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.
- United States
- Hosted on Fastly
Top issues to fix
8 issues found · 2 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
TLS certificate expires in 25 days
SecurityRenew soon or enable auto-renewal to avoid a browser-warning outage.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+2 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
6 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Fastly Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.
Meta tags
- Title
- Fastly Polyfill
- Description
- Fastly Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.
- Canonical
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1, shrink-to-fit=no
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
No technologies detected.
Hosting & CDN
- Hosting provider
- Fastly
- CDN provider
- —
- IP address
- 151.101.65.91
- ASN
- AS54113 (FASTLY - Fastly, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Certainly
- Subject
- polyfill-fastly.net
- Valid from
- Jul 21, 2026
- Valid to
- Aug 20, 2026
- Days until expiry
- 25
- SAN domains
- polyfill-fastly.io, polyfill-fastly.net
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 0 · H3 0
Links
1 internal · 3 external · 0 broken
Images
1 total · 1 missing alt
Scripts / Styles
2 scripts · 0 stylesheets
JS / CSS size
7.8 KB · 90.1 KB
Page size
153 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
Scan details
- Requested URL
- https://polyfill-fastly.io
- Final URL
- https://polyfill-fastly.io
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 3 ms
- HTML size
- 153 KB
- Redirect chain
- https://polyfill-fastly.io
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does polyfill-fastly.io use?
- We did not detect any specific technologies for polyfill-fastly.io in the latest scan.
- Is polyfill-fastly.io secure (HTTPS)?
- Yes. polyfill-fastly.io uses TLS 1.3 with a certificate issued by Certainly, valid until Aug 20, 2026.
- Who hosts polyfill-fastly.io?
- polyfill-fastly.io is hosted on Fastly.
- What is polyfill-fastly.io's SEO score?
- polyfill-fastly.io scored 75/100 for SEO in the latest analysis (fair).
- What is polyfill-fastly.io's overall website score?
- polyfill-fastly.io has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card