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javascript.nu

https://javascript.nu· First analyzed 09 May 2026· Updated 09 May 2026
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javascript.nu
Desktop screenshot of javascript.nu
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Mobile

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Hosting Provider

Loopia

IP Address

93.188.2.52

Site Location

🇸🇪 Swedenvia ip

Server Location

🇸🇪 Västerås, Sweden

ASN

AS39570

Organization

Loopia

Server

Nginx

Nameservers

ns1.loopia.se.ns2.loopia.se.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
484 ms10%
Speed Index
629 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
19 KB
23 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Loopia

Technology Stack

4 Technologies Detected

Advertising

2
Google AdsGoogle AdSense

Analytics

1
Google Analytics

Web Servers

1
Nginx

SEO Analysis

D49/100
12
10
3
Meta Tags14/15
Content8/12
Headings0/8
Technical6/25
E-E-A-T3/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
J
javascript.nujavascript.nu

Omids nybörjarkurs i HTML och JAVASCRIPT! - www.JavaScript.nu

Kurs och guide i HTML, JavaScript, DHTML och Perl. Gratis JavaScript i scriptarkivet. Även tutorials i CGI, SSI, Java och CSS (Style Sheets).

Title Length61 chars

Recommended: 50-60 chars (~379px / 580px)

Description Length141 chars

Recommended: 120-160 chars

Issues (3)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (113/117) — critical for accessibility and SEO
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

13 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1 URLs

robots.txt

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.

Sponsored

AI & LLM Readiness

F34/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
0/25
Citation
6/25

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
code blocks
Text ratio:4%
Words:462
Token eff.:Optimal
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary31w
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 (10)
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.
F
39/100
4
Passed
7
Critical
1
Warnings
Images & Alt Text
5/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
3/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
10/15
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
5/15
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.
5 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.
66/100
A+
2 mg
CO₂e / view
19.2 KB
Page Weight
95%
Cleaner Than
New Visitor
2 mg
vs
Returning (cached)
1 mg
Annual (10K/mo)
228 g
Emission Segments
Data Center
<0.001 g
Network
<0.001 g
Device
1 mg
Resource Breakdown
JavaScript
5.5 KB
Images
2.8 KB
CSS
1.1 KB
HTML
9.8 KB
Green Hosting Verified
Loopia
GWF Verified
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

45d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

26.03.2026

Valid Until

24.06.2026

Subject Alternative Names (1)

javascript.nu

SHA-256 Fingerprint

64:0E:BA:54:2F:79:84:3D:33:03:B9:71:F0:BE:8C:1D:83:93:3A:42...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding
⚡ Brotli(br)
content-type
text/html
date
Sat, 09 May 2026 21:01:15 GMT
server
nginx
vary
Accept-Encoding
x-loopia-node
172.22.223.112
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

50

SPF
DKIM
DMARC

MX Records (2)

mailcluster.loopia.se
mail2.loopia.se

Domain Information

javascript.nu

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Data Protection Officer mentioned

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
27/100
Not Mobile Friendly
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.
5 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

MS Sans Serif

WCAG Partial
51/100
Readability
/30
13/30

10px · LH --

Hierarchy
/20
10/20
WCAG
/25
14/25

3:1 min contrast

Performance
/25
14/25

2 fonts

Heading Font

MS Sans Serif

Body Font

MS Sans Serif

Sans10px

Contrast Ratio

3:1

24 issues

Reading Comfort

Single Family

left aligned
10px
p

❌ Critical: 10px body text is too small. Minimum 14px, recommend 16px+.

❌ Very complex text: Flesch score 25/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 24 elements below WCAG AA threshold (min 3.0:1).

✅ Lean font stack: 2 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFlesch 25

Color Palette

8 unique colors
Light
#ffffff
Background· 72.30000000000001%
#9ab3cd
Primary· 3.4%
#6499d6
Accent· 3.1%
#4d5fa3
Secondary· 2%
#b4d1de
Secondary· 0.9%

Business & Marketing Stack

2 Tools Detected

Advanced

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

Advertising

1
Google AdsEnterprise

Ad platforms and retargeting pixels

2

Categories

2

Total Tools

1

Enterprise

0

Mid-Market

Assessment: Well-developed marketing technology stack

Ad Networks

Google AdSense

Sponsored

Scripts & Styles

6 Resources

6
Scripts
0
Styles
0
Async
0
Defer

Top Script Sources

pagead2.googlesyndication.com(3)meny.js(1)google-analytics.com(1)statcounter.com(1)

Website Identity

javascript.nu

Location detected: 🇸🇪 Swedenvia ip

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Last analyzed: 09 May 2026 at 21:01

Historical Analysis & Change Tracking