programminghistorian.org

https://programminghistorian.org· First analyzed 11 May 2026· Updated 11 May 2026

Export

$Desktop screenshot of programminghistorian.org$

Mobile

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Hosting Provider

GitHub Pages

pages.github.com

IP Address

185.199.108.153

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

ns-cloud-e4.googledomains.com.ns-cloud-e2.googledomains.com.ns-cloud-e3.googledomains.com.ns-cloud-e1.googledomains.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

614 ms10%

Speed Index

798 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

21 KB

20 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

Infrastructure

Platform

GitHub Pages

CDN

Fastly

Technology Stack

7 Technologies Detected

CSS Frameworks

Analytics

Libraries

Icon Libraries

Fonts

SEO Analysis

D56/100

Meta Tags9/15

Content9/12

Headings6/8

Technical11/21

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

programminghistorian.orgprogramminghistorian.org

Programming Historian | Programming Historian

No description available for this page.

Title Length45 chars

Recommended: 50-60 chars (~274px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description — important for click-through rates in SERPs

7 issues found

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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

F35/100

Bot Access

20/25

Machine Read.

6/25

Schema Data

0/25

Citation

9/25

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:14%

Words:275

Token eff.:Too Short

Sections/1K:7.3

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary23w

Descriptive Headingsavg 4.5w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

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.

75/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

15/20

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

9/15

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.

2 recommendations

•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.

57/100

A+

3 mg

CO₂e / view

21.2 KB

Page Weight

95%

Cleaner Than

New Visitor

3 mg

Returning (cached)

2 mg

Annual (10K/mo)

312 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

1 mg

Resource Breakdown

JavaScript

1.8 KB

Images

5.4 KB

CSS

7.1 KB

Fonts

2.3 KB

HTML

4.5 KB

Green Hosting Not Verified

GitHub Pages

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

72d

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

23.04.2026

Valid Until

22.07.2026

Subject Alternative Names (1)

programminghistorian.org

SHA-256 Fingerprint

D0:84:76:E4:93:2D:2B:8E:08:37:A0:1D:6D:8F:18:02:4E:36:12:B1...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

4357

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (5)

alt1.aspmx.l.google.com

alt4.aspmx.l.google.com

aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

programminghistorian.org

Domain Age

13y 10m

Created

27.06.2012

Expires

27.06.2026

Last Updated

17.07.2025

Registrar

Squarespace Domains II LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

57/100

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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Crete Round + Verdana

WCAG Partial

57/100

Readability

/30

20/30

16px · LH --

Hierarchy

/20

12/20

2x ratio

WCAG

/25

16/25

1.41:1 min contrast

Performance

/25

9/25

3 fonts · 1 req

Heading Font

Crete Round

Sans32px

Body Font

Verdana

Sans16px

Contrast Ratio

1.41:1

13 issues

Reading Comfort

~40 CPL

Narrow lines

32px

26px

16px

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

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

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 1.4:1).

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

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

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

GGoogle FontsFlesch 0

Color Palette

5 unique colors

9.74:1 AAA Dark

#444444

Other· 54.400000000000006%

#ffffff

Background· 38.4%

#d6dfe2

Primary· 2.8%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)ssl.google-analytics.com(1)code.jquery.com(1)cdnjs.cloudflare.com(1)maxcdn.bootstrapcdn.com(1)

Website Identity

programminghistorian.org

13 years old

Location detected: 🇺🇸 United Statesvia ip

Squarespace Domains II LLC📧 Google Workspaceen

Social Profiles

GitHub

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Last analyzed: 11 May 2026 at 02:29

Historical Analysis & Change Tracking