codeblog.jonskeet.uk

https://codeblog.jonskeet.uk· First analyzed 01 Jun 2026· Updated 01 Jun 2026

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Mobile

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Hosting Provider

Automattic, Inc

IP Address

192.0.78.12

Site Location

🇬🇧 United Kingdomvia tld

Server Location

🇺🇸 San Francisco, United States

ASN

AS2635

Server

Nginx

Performance

100

Core Web Vitals

Weight

First Contentful Paint

538 ms10%

Speed Index

699 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

213 KB

30 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv.

cms

pubCustom

Technology Stack

8 Technologies Detected

Plugins

UI Components

CSS Frameworks

Web Servers

Customer Support

SEO Analysis

C67/100

Meta Tags4/15

Content11/12

Headings6/8

Technical18/25

E-E-A-T3/7

Images3/7

Links5/5

URL5/5

Social3/5

Freshness2/4

Mobile4/4

Indexability3/3

codeblog.jonskeet.ukcodeblog.jonskeet.uk

Jon Skeet's coding blog

No description available for this page.

Title Length23 chars

Recommended: 50-60 chars (~136px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Most images missing alt text (4/4) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

490 URLs

robots.txt

14 rules

Sitemap reference found

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

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

Sponsored

AI & LLM Readiness

D45/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

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

blockquotescode blocksnav

Text ratio:37%

Words:19,674

Token eff.:Excessive

Sections/1K:0.8

Depth:3/5

Structured Data

Microdata

Citation Readiness

Opening Summary44w

Descriptive Headingsavg 3.6w

Canonical URL

Open Graph2/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

AI readiness recommendation preview...

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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.

85/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

18/20

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

15/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

7/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

1 recommendation

•Accessibility recommendation preview...

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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.

67/100

A+

26 mg

CO₂e / view

213.1 KB

Page Weight

95%

Cleaner Than

New Visitor

30 mg

Returning (cached)

15 mg

Annual (10K/mo)

3.2 kg

Emission Segments

Data Center

6 mg

Network

6 mg

Device

14 mg

Resource Breakdown

JavaScript

76.9 KB

Images

6.0 KB

CSS

10.3 KB

HTML

65.9 KB

Other

53.9 KB

Green Hosting Not Verified

Automattic, Inc

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

36%Critical

Interactive

HTTPS

No WAF

55d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

27.04.2026

Valid Until

26.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

tls.automattic.comartistreebonsai.comcamillabrogaard.comcodeblog.jonskeet.ukgerryking.comhjalpa.iojapanbookshop.comjessepaikin.com+12 more

SHA-256 Fingerprint

09:E2:A4:15:9D:7F:85:E0:2A:AE:C0:F1:0E:2B:7B:C3:85:5F:BD:EA...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

clear

cache-control

🟡 300s(max-age=300, must-revalidate)

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Mon, 01 Jun 2026 18:22:09 GMT

host-header

WordPress.com

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

codeblog.jonskeet.uk

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.

76/100

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

1 recommendation

•Mobile compatibility recommendation preview...

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Typography & Readability

Lato

WCAG Partial

68/100

Readability

/30

21/30

16px · LH 1.50

Hierarchy

/20

14/20

2.06x ratio

WCAG

/25

17/25

1:1 min contrast

Performance

/25

16/25

1 font

Heading Font

Lato

Sans33px

Body Font

Lato

Sans16px

Contrast Ratio

1:1

3 issues

Reading Comfort

Single Font Family

left aligned

33px

24px

22px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

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

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 3 elements below WCAG AA threshold (min 1.0:1).

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

✅ Strong hierarchy: Headlines are 2.1x larger than body text.

Buy on MyFontsFlesch 0

Color Palette

8 unique colors

21:1 AAA Light

#ffffff

Primary· 64.10000000000001%

#000000

Background· 19.5%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

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Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(9)0.gravatar.com(1)stats.wp.com(1)

Website Identity

codeblog.jonskeet.uk

Location detected: 🇬🇧 United Kingdomvia tld

Social Profiles

GitHub

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Last analyzed: 01 Jun 2026 at 18:22

Historical Analysis & Change Tracking