prismjs.com
Prism
Last scanned Jul 26, 2026, 4:17 PM · 1 view
Overall score
Great
Summary
This website uses Google Analytics behind Netlify CDN. SEO is fair (55/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Missing meta description.
Top issues to fix
11 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.
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
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.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
+5 more issues — details in the sections below.
SEO
7 issue(s) found
Performance
9 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Meta tags
- Title
- Prism
- Description
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Netlify
- 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
- Let's Encrypt
- Subject
- *.dev.prismjs.com
- Valid from
- Jul 1, 2026
- Valid to
- Sep 29, 2026
- Days until expiry
- 62
- SAN domains
- *.dev.prismjs.com, *.prismjs.com, prismjs.com
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 11 · H2 6 · H3 0
Links
46 internal · 51 external · 20 broken
Images
11 total · 1 missing alt
Scripts / Styles
7 scripts · 2 stylesheets
JS / CSS size
157 B · 0 B
Page size
49.9 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
- Multiple H1 headings found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://prismjs.com
- Final URL
- https://prismjs.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 8 ms
- HTML size
- 49.9 KB
- Redirect chain
- https://prismjs.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does prismjs.com use?
- prismjs.com is built with Google Analytics.
- Is prismjs.com secure (HTTPS)?
- Yes. prismjs.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 29, 2026.
- Who hosts prismjs.com?
- Hosting provider information for prismjs.com is not available yet.
- What is prismjs.com's SEO score?
- prismjs.com scored 55/100 for SEO in the latest analysis (fair).
- What is prismjs.com's overall website score?
- prismjs.com has an overall SiteGraph score of 80/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card