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codemirror.net

CodeMirror

Last scanned Jul 26, 2026, 5:47 AM

79

Overall score

Fair

Summary

This website uses Nginx hosted on TRANSIP-AS - Signet B.V., NL. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance good (85/100). Top issue: Missing meta description.

Netherlands
Hosted on TRANSIP-AS - Signet B.V., NL

Top issues to fix

8 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.

+2 more issues — details in the sections below.

70

SEO

4 issue(s) found

85

Performance

125 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.

Contact

Email, phone, and address published on this site's own pages.

Source: https://codemirror.net/docs/ref/#view.EditorView.bidiSpans

Meta tags

Title
CodeMirror
Description
Canonical
Language
en-US
Charset
utf8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
CodeMirror
og:description
In-browser code editor
og:type
website
og:url
http://codemirror.net/

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

CDN provider
—
IP address
149.210.142.219
ASN
AS20857 (TRANSIP-AS - Signet B.V., NL)

DNS records

TypeValue
A
  • 149.210.142.219
AAAA
  • 2a01:7c8:aab0:26e:5054:ff:fe3a:8388
MX
  • mail.marijnhaverbeke.nl
TXT
  • v=spf1 mx include:mail.marijnhaverbeke.nl ?all
  • v=DMARC1; p=none
NS
  • ns0.transip.net
  • ns2.transip.eu
  • ns1.transip.nl
CAA—
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
codemirror.net
Valid from
Jul 21, 2026
Valid to
Oct 19, 2026
Days until expiry
85
SAN domains
codemirror.net, discuss.codemirror.net, lezer.codemirror.net

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 4 · H3 24

Links

25 internal · 47 external · 0 broken

Images

18 total · 0 missing alt

Scripts / Styles

2 scripts · 1 stylesheets

JS / CSS size

1.5 MB · 8.3 KB

Page size

12.5 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
10
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

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

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://codemirror.net
Final URL
https://codemirror.net
HTTP status
200
HTTP version
HTTP/1.1
Response time
125 ms
HTML size
12.5 KB
Redirect chain
https://codemirror.net

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does codemirror.net use?
codemirror.net is built with Nginx.
Is codemirror.net secure (HTTPS)?
Yes. codemirror.net uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 19, 2026.
Who hosts codemirror.net?
codemirror.net is hosted on TRANSIP-AS - Signet B.V., NL.
What is codemirror.net's SEO score?
codemirror.net scored 70/100 for SEO in the latest analysis (fair).
What is codemirror.net's overall website score?
codemirror.net has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.