What technology does polyfill-fastly.net use?

We did not detect any specific technologies for polyfill-fastly.net in the latest scan.

Is polyfill-fastly.net secure (HTTPS)?

Yes. polyfill-fastly.net uses TLS 1.3 with a certificate issued by Certainly, valid until Aug 20, 2026.

Who hosts polyfill-fastly.net?

Hosting provider information for polyfill-fastly.net is not available yet.

What is polyfill-fastly.net's SEO score?

polyfill-fastly.net scored 70/100 for SEO in the latest analysis (fair).

What is polyfill-fastly.net's overall website score?

polyfill-fastly.net has an overall SiteGraph score of 80/100, combining SEO, performance, security, and accessibility.

polyfill-fastly.net

Fastly Polyfill

Last scanned Jul 26, 2026, 12:49 PM

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. SEO is fair (70/100) 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.

Top issues to fix

10 issues found · 2 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
TLS certificate expires in 22 days
Security
Renew soon or enable auto-renewal to avoid a browser-warning outage.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+4 more issues — details in the sections below.

SEO

5 issue(s) found

100

Performance

6 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

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: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

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: 22
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 · 4 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: Not 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
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://polyfill-fastly.net
Final URL: https://polyfill-fastly.net
HTTP status: 200
HTTP version: HTTP/2
Response time: 3 ms
HTML size: 153 KB
Redirect chain: https://polyfill-fastly.net

See something wrong on this report? Request a correction

Frequently asked questions

What technology does polyfill-fastly.net use?: We did not detect any specific technologies for polyfill-fastly.net in the latest scan.
Is polyfill-fastly.net secure (HTTPS)?: Yes. polyfill-fastly.net uses TLS 1.3 with a certificate issued by Certainly, valid until Aug 20, 2026.
Who hosts polyfill-fastly.net?: Hosting provider information for polyfill-fastly.net is not available yet.
What is polyfill-fastly.net's SEO score?: polyfill-fastly.net scored 70/100 for SEO in the latest analysis (fair).
What is polyfill-fastly.net's overall website score?: polyfill-fastly.net has an overall SiteGraph score of 80/100, combining SEO, performance, security, and accessibility.