d3js.org
D3 by Observable | The JavaScript library for bespoke data visualization
Last scanned Jul 25, 2026, 4:25 PM · 2 views
Overall score
Fair
Summary
The JavaScript library for bespoke data visualization. This website uses Cloudflare Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (75/100) and accessibility is fair (70/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
The JavaScript library for bespoke data visualization
- United States
- Hosted on Cloudflare
Top issues to fix
9 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
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.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Title longer than 60 characters
SEOShorten the title to under 60 characters so search results don't truncate it.
+3 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
649 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
The JavaScript library for bespoke data visualization
Meta tags
- Title
- D3 by Observable | The JavaScript library for bespoke data visualization
- Description
- The JavaScript library for bespoke data visualization
- Canonical
- https://d3js.org
- Language
- en-US
- Charset
- utf-8
- Viewport
- width=device-width,initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 104.26.6.30
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- d3js.org
- Valid from
- Jul 17, 2026
- Valid to
- Oct 15, 2026
- Days until expiry
- 81
- SAN domains
- d3js.org, *.d3js.org
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 2 · H2 9 · H3 0
Links
10 internal · 71 external · 0 broken
Images
57 total · 55 missing alt
Scripts / Styles
6 scripts · 1 stylesheets
JS / CSS size
47.9 KB · 0 B
Page size
69.6 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 116
SEO issues
- Title longer than 60 characters
- Multiple H1 headings found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
- Over half of images are missing alt text
Scan details
- Requested URL
- https://d3js.org
- Final URL
- https://d3js.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 648 ms
- HTML size
- 69.6 KB
- Redirect chain
- https://d3js.org
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Frequently asked questions
- What technology does d3js.org use?
- d3js.org is built with Vue.js, Cloudflare Analytics.
- Is d3js.org secure (HTTPS)?
- Yes. d3js.org uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 15, 2026.
- Who hosts d3js.org?
- d3js.org is hosted on Cloudflare, behind Cloudflare CDN.
- What is d3js.org's SEO score?
- d3js.org scored 75/100 for SEO in the latest analysis (fair).
- What is d3js.org's overall website score?
- d3js.org has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card