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root.cern

https://root.cern· First analyzed 13 May 2026· Updated 13 May 2026
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root.cern
Desktop screenshot of root.cern
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Mobile

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Hosting Provider

CERN-LAN1

IP Address

137.138.6.72

Site Location

🇨🇭 Switzerlandvia ip

Server Location

🇨🇭 Geneva, Switzerland

ASN

AS513

Organization

CERN-LAN1

Server

Apache

Nameservers

ext-dns-2.cern.ch.ext-dns-1.cern.ch.

Performance

92

Core Web Vitals

Weight

First Contentful Paint
1.4 s10%
Speed Index
1.8 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2.6 MB
31 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
CERN-LAN1

Technology Stack

3 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Web Servers

1
Apache

SEO Analysis

B75/100
21
5
1
Meta Tags11/15
Content9/12
Headings6/8
Technical22/25
E-E-A-T5/7
Images1/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile3/4
Indexability3/3
R
root.cernroot.cern

ROOT: Analyzing petabytes of data, scientifically. - ROOT

Analyzing petabytes of data, scientifically.

Title Length57 chars

Recommended: 50-60 chars (~342px / 580px)

Description Length45 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (17/19) — critical for accessibility and SEO

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

512 URLs

robots.txt

1 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

9/100
Poor
3 13 1

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

D49/100
Bot Access
20/25
Machine Read.
11/25
Schema Data
3/25
Citation
15/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
nav
Text ratio:5%
Words:365
Token eff.:Optimal
Sections/1K:11
Depth:1/5

Structured Data

1 JSON-LD
Person×1.3

Citation Readiness

Opening Summary13w
Descriptive Headingsavg 2w
Canonical URL
Open Graph3/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
AI readiness recommendation preview...
Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
C
62/100
10
Passed
6
Critical
0
Warnings
Images & Alt Text
3/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
14/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •Accessibility recommendation preview...
Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
18/100
E
332 mg
CO₂e / view
2.6 MB
Page Weight
30%
Cleaner Than
New Visitor
379 mg
vs
Returning (cached)
190 mg
Annual (10K/mo)
39.8 kg
Emission Segments
Data Center
74 mg
Network
80 mg
Device
178 mg
Resource Breakdown
JavaScript
1.9 MB
Images
471.5 KB
CSS
262.3 KB
HTML
20.7 KB
Green Hosting Not Verified
CERN-LAN1
7 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

195d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

05.11.2025

Valid Until

24.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.cern.ch*.app.cern.ch*.apptest.cern.ch*.docs.cern.ch*.web.cern.ch*.webtest.cern.chabout.cernaccelerating-news.eu+12 more

SHA-256 Fingerprint

17:0D:6B:78:94:64:BC:C4:3F:F6:0F:D0:0C:82:5B:26:15:2E:11:60...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
cache-control
🟣 Private(private)
content-length
20869
content-type
text/html
date
Wed, 13 May 2026 17:42:06 GMT
last-modified
Tue, 12 May 2026 09:12:01 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

root.cern

Domain Age
10y 2m

Created

16.02.2016

Expires

16.02.2027

Last Updated

17.02.2026

Registrar

CSC Corporate Domains, Inc.

DNSSEC
Not Enabled

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
C
65/100
Mobile Friendly1 breakpoint
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width, initial-scale=1.0
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

-apple-system

WCAG Partial
73/100
Readability
/30
17/30

13px · LH 1.50

Hierarchy
/20
18/20

2.82x ratio

WCAG
/25
18/25

1.97:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

-apple-system

Sans37px

Body Font

-apple-system

Sans13px

Contrast Ratio

1.97:1

2 issues

Reading Comfort

~38 CPL

Narrow lines
37px
h1
59px
h2
13px
p
Golden Ratio
Scale

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 2.0:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 2.8x larger than body text.

✅ System fonts: Zero font loading delay — best possible LCP impact.

Flesch 58

Color Palette

11 unique colors
7.87:1 AAA Light
#ffffff
Background· 68.3%
#565053
Other· 2.8%
#346294
Primary· 8.2%
#e3ddd9
Secondary· 3.2%
#b39b8e
Secondary· 2.5%
#7d95a7
Secondary· 2%
#576f89
Secondary· 1.2%
#2b4e76
Secondary· 0.5%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

7 Resources

6
Scripts
1
Styles
0
Async
0
Defer

Top Script Sources

local(5)root.cern(1)

Website Identity

ROOT

Person
root-dev@cern.ch
root.cern/
10 years old
Location detected: 🇨🇭 Switzerlandvia ip
CSC Corporate Domains, Inc.en

Social Profiles

GitHub

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Last analyzed: 13 May 2026 at 17:42

Historical Analysis & Change Tracking