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lavoisier.fr

https://lavoisier.fr· First analyzed 13 May 2026· Updated 13 May 2026
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lavoisier.fr
Desktop screenshot of lavoisier.fr
Mobile screenshot of lavoisier.fr
Mobile

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Hosting Provider

Orange

IP Address

92.154.24.89

Site Location

🇫🇷 Francevia tld

Server Location

🇫🇷 Montrouge, France

ASN

AS3215

Server

Nginx

Nameservers

ns-78-b.gandi.net.ns-247-c.gandi.net.ns-153-a.gandi.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
267 ms10%
Speed Index
347 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2 KB
10 requests

Image Optimization

WebP
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Orange

Technology Stack

1 Technologies Detected

Web Servers

1
Nginx

SEO Analysis

D45/100
12
11
2
Meta Tags10/15
Content8/12
Headings6/8
Technical7/25
E-E-A-T0/7
Images3/7
Links2/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
L
lavoisier.frlavoisier.fr

Reprise des éditions Lavoisier par les éditions JLE

No description available for this page.

Title Length51 chars

Recommended: 50-60 chars (~298px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

13 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

109 rules

Allows all crawlers

Local SEO

Local Search Readiness

0/100
Poor
15 2

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

F12/100
Bot Access
3/25
Machine Read.
5/25
Schema Data
0/25
Citation
4/25

AI Bot Access

0/14 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
Text ratio:18%
Words:168
Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary116w
Descriptive Headings
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
AI readiness recommendation preview...
Upgrade to view recommendations

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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
61/100
8
Passed
5
Critical
0
Warnings
Images & Alt Text
10/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
11/20
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
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
1/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
3 recommendations
  • •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.
62/100
A+
<0.001 g
CO₂e / view
2.5 KB
Page Weight
95%
Cleaner Than
New Visitor
<0.001 g
vs
Returning (cached)
<0.001 g
Annual (10K/mo)
36 g
Emission Segments
Data Center
<0.001 g
Network
<0.001 g
Device
<0.001 g
Resource Breakdown
HTML
2.5 KB
Green Hosting Not Verified
Orange
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

80d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

04.05.2026

Valid Until

02.08.2026

Subject Alternative Names (8)

diffusion.lavoisier.frfacture.lavoisier.frlavoisier.frparking.jle.comparking.jle.prod.public.doloforge.compresse.lavoisier.frssl.lavoisier.frwww.lavoisier.fr

SHA-256 Fingerprint

58:AC:53:41:A7:71:3F:1A:E6:18:42:42:6B:09:9E:C0:45:8C:0E:E0...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

connection
keep-alive
content-encoding
📦 Gzip(gzip)
content-type
text/html
date
Wed, 13 May 2026 19:15:56 GMT
etag
W/"6811d020-1fd7"
last-modified
Wed, 30 Apr 2025 07:24:16 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

68

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.lavoisier.fr

Domain Information

lavoisier.fr

Domain Age
31y 1m

Created

20.04.1995

Expires

18.06.2028

Last Updated

12.05.2026

Registrar

GANDI

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.
F
31/100
Not 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.
4 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Arial

WCAG AA
79/100
Readability
/30
18/30

14px · LH --

Hierarchy
/20
19/20

2x ratio · ✓ H1→H6

WCAG
/25
22/25

5.48:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

Arial

Sans28px

Body Font

Arial

Sans14px

Contrast Ratio

5.48:1

WCAG AA (≥4.5:1)

Reading Comfort

~44 CPL

Narrow lines
28px
h1
14px
p

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Hard to read: Flesch score 41/100. Simplify sentences for wider reach.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.5:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

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

Flesch 41

Color Palette

6 unique colors
Light
#e5e5e5
Other· 58.1%
#618295
Primary· 1.6%
#f1eea2
Accent· 0.2%

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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Website Identity

lavoisier.fr

31 years old
Location detected: 🇫🇷 Francevia tld
GANDI

Sponsored

Last analyzed: 13 May 2026 at 19:16

Historical Analysis & Change Tracking