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leafletjs.com

Leaflet - a JavaScript library for interactive maps

Last scanned Jul 25, 2026, 10:25 PM · 2 views

81

Overall score

Great

Summary

This website uses Google Analytics hosted on Fastly behind Fastly CDN. SEO is fair (65/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing meta description.

United States
Hosted on Fastly

Top issues to fix

10 issues found · 3 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing meta description

    SEO

    Add a ~150-character meta description to control your search-result snippet and lift click-through rate.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • 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.

+4 more issues — details in the sections below.

65

SEO

5 issue(s) found

100

Performance

3 ms

65

Security

HTTPS & header checks

100

Accessibility

0 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.

X (Twitter)

Meta tags

Title
Leaflet - a JavaScript library for interactive maps
Description
Canonical
Language
en
Charset
utf-8
Viewport
width=device-width, initial-scale=1.0
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
Leaflet — an open-source JavaScript library for interactive maps
og:description
Leaflet is a modern, lightweight open-source JavaScript library for mobile-friendly interactive maps.
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Google Analytics

Hosting & CDN

Hosting provider
Fastly
CDN provider
Fastly
IP address
185.199.108.153
ASN
AS54113 (FASTLY - Fastly, Inc., US)

DNS records

TypeValue
A
  • 185.199.108.153
AAAA—
MX—
TXT—
NS
  • nsa2.srv53.net
  • nsa1.srv53.com
  • nsc2.srv53.net
  • nsb4.srv53.org
  • nsb2.srv53.net
  • nsd4.srv53.net
  • nsd2.srv53.org
  • nsa2.srv53.org
  • nsc2.srv53.com
  • nsb1.srv53.com
  • nsd2.srv53.com
  • nsc3.srv53.org
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
leafletjs.com
Valid from
Jun 30, 2026
Valid to
Sep 28, 2026
Days until expiry
64
SAN domains
leafletjs.com, www.leafletjs.com

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 3 · H3 8

Links

8 internal · 30 external · 1 broken

Images

4 total · 0 missing alt

Scripts / Styles

7 scripts · 5 stylesheets

JS / CSS size

18.1 KB · 29.4 KB

Page size

13.8 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Missing meta description
  • Missing canonical link
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://leafletjs.com
Final URL
https://leafletjs.com
HTTP status
200
HTTP version
HTTP/2
Response time
3 ms
HTML size
13.8 KB
Redirect chain
https://leafletjs.com

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does leafletjs.com use?
leafletjs.com is built with Google Analytics.
Is leafletjs.com secure (HTTPS)?
Yes. leafletjs.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 28, 2026.
Who hosts leafletjs.com?
leafletjs.com is hosted on Fastly, behind Fastly CDN.
What is leafletjs.com's SEO score?
leafletjs.com scored 65/100 for SEO in the latest analysis (fair).
What is leafletjs.com's overall website score?
leafletjs.com has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.