teachinghistory.org

https://teachinghistory.org· First analyzed 07 May 2026· Updated 07 May 2026

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teachinghistory.org

Mobile

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Hosting Provider

George Mason University

IP Address

129.174.134.63

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Fairfax, United States

ASN

AS11279

Organization

George Mason University

Nameservers

ns1.rrchnm.org.ns3.rrchnm.org.ns2.rrchnm.org.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.5 s10%

Speed Index

1.9 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.4 MB

47 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

3 Technologies Detected

CSS Frameworks

Tailwind CSS

Analytics

Matomo

Languages

PHPv8.4.18

SEO Analysis

D58/100

Meta Tags9/15

Content11/12

Headings3/8

Technical16/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

teachinghistory.orgteachinghistory.org

Home | TeachingHistory.org

TeachingHistory.org is designed to help K–12 history teachers access resources and materials to improve U.S. history education in the classroom.

Title Length26 chars

Recommended: 50-60 chars (~155px / 580px)

Description Length144 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (11/20) — critical for accessibility and SEO

9 issues found

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Crawlability

Sitemap

robots.txt

53 rules

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.

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AI & LLM Readiness

D44/100

Bot Access

20/25

Machine Read.

12/25

Schema Data

0/25

Citation

12/25

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

def. listsnavheader/footer

Text ratio:15%

Words:653

Token eff.:Optimal

Sections/1K:24.5

Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary25w

Descriptive Headingsavg 2.7w

Canonical URL

Open Graph0/3

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.

83/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

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

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

13/15

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.

41/100

177 mg

CO₂e / view

1.4 MB

Page Weight

60%

Cleaner Than

New Visitor

203 mg

Returning (cached)

101 mg

Annual (10K/mo)

21.3 kg

Emission Segments

Data Center

40 mg

Network

43 mg

Device

95 mg

Resource Breakdown

JavaScript

38.3 KB

Images

1.3 MB

CSS

68.2 KB

HTML

8.4 KB

Other

1.5 KB

Green Hosting Not Verified

George Mason University

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

41%Poor

Interactive

HTTPS

No WAF

89d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

07.05.2026

Valid Until

05.08.2026

Subject Alternative Names (1)

teachinghistory.org

SHA-256 Fingerprint

18:ED:28:F5:E5:2B:12:5B:ED:56:0F:4B:3A:96:F0:FB:A2:06:16:9B...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=2592000

cache-control

🟡 12 Hours(max-age=43200, public)

content-encoding

zstd

content-language

content-type

text/html; charset=UTF-8

date

Thu, 07 May 2026 15:37:48 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

Domain Information

teachinghistory.org

Domain Age

23y 3m

Created

27.01.2003

Expires

27.01.2027

Last Updated

02.01.2026

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

62/100

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

1 recommendation

•Mobile compatibility recommendation preview...

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Typography & Readability

Arial Narrow + Helvetica Neue

WCAG Partial

53/100

Readability

/30

18/30

11px · LH 1.50

Hierarchy

/20

8/20

WCAG

/25

13/25

1:1 min contrast

Performance

/25

14/25

System fonts

Heading Font

Arial Narrow

Sans

Body Font

Helvetica Neue

Sans11px

Contrast Ratio

1:1

26 issues

Reading Comfort

~74 CPL

Optimal (45–75)

18px

15px

11px

❌ Critical: 11px body text is too small. Minimum 14px, recommend 16px+.

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

✅ Optimal line length: ~74 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 28/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 26 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

Buy on MyFontsFlesch 28

Color Palette

6 unique colors

Dark

#52594b

Text· 7%

#f1f1e7

Primary· 50.99999999999999%

#6b9482

Secondary· 21.2%

#8ea686

Secondary· 9.7%

#c4d3bb

Secondary· 9.3%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)stats.rrchnm.org(1)rrchnm.org(1)

Website Identity

teachinghistory.org

23 years old

Location detected: 🇺🇸 United Statesvia ip

NameCheap, Inc.en

Social Profiles

X (Twitter)

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Last analyzed: 07 May 2026 at 22:34

Historical Analysis & Change Tracking