influenzaarchive.org

https://influenzaarchive.org· First analyzed 28 May 2026· Updated 28 May 2026

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Hosting Provider

University of Michigan Library

IP Address

141.213.128.183

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Ann Arbor, United States

ASN

AS36375

Organization

University of Michigan Library

Server

Apache

Nameservers

ns-1370.awsdns-43.org.ns-1889.awsdns-44.co.uk.ns-940.awsdns-53.net.ns-132.awsdns-16.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.1 s10%

Speed Index

1.5 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

333 KB

29 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

University of Michigan Library

Technology Stack

3 Technologies Detected

Libraries

jQueryv1.4.4

Analytics

Google Analytics

Web Servers

Apachev2.4.67

SEO Analysis

D52/100

Meta Tags9/15

Content9/12

Headings8/8

Technical5/21

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

influenzaarchive.orginfluenzaarchive.org

The American Influenza Epidemic of 1918: A Digital Encyclopedia

No description available for this page.

Title Length63 chars

Recommended: 50-60 chars (~367px / 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)

10 issues found

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Local SEO

Local Search Readiness

5/100

Poor

2 13 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.

9/25

Schema Data

0/25

Citation

5/25

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

Text ratio:21%

Words:335

Token eff.:Optimal

Sections/1K:14.9

Structured Data

No Schema

Citation Readiness

Opening Summary46w

Descriptive Headingsavg 3.8w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

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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.

68/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

8/20

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.

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.

51/100

41 mg

CO₂e / view

333.2 KB

Page Weight

90%

Cleaner Than

New Visitor

47 mg

Returning (cached)

24 mg

Annual (10K/mo)

4.9 kg

Emission Segments

Data Center

9 mg

Network

10 mg

Device

22 mg

Resource Breakdown

JavaScript

95.9 KB

Images

152.9 KB

CSS

81.1 KB

HTML

3.3 KB

Green Hosting Not Verified

University of Michigan Library

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

36%Critical

Interactive

HTTPS

No WAF

66d

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/1.1

Valid From

05.05.2026

Valid Until

03.08.2026

Subject Alternative Names (10)

*.flupedia.org*.influenzaarchive.com*.influenzaarchive.org*.influenzaencyclopedia.com*.influenzaencyclopedia.orgflupedia.orginfluenzaarchive.cominfluenzaarchive.org+2 more

SHA-256 Fingerprint

E4:42:22:24:4E:FC:22:89:7E:30:EB:6B:B2:62:08:95:81:FC:02:3A...

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟣 Private(private)

content-encoding

📦 Gzip(gzip)

content-length

3064

content-type

text/html

date

Thu, 28 May 2026 16:51:46 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.umdl.umich.edu

Domain Information

influenzaarchive.org

Domain Age

16y 11m

Created

22.06.2009

Expires

22.06.2029

Last Updated

30.03.2026

Registrar

Tucows Domains Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

37/100

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.

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica + Georgia

WCAG AA

70/100

Readability

/30

18/30

16px · LH --

Hierarchy

/20

19/20

2x ratio · ✓ H1→H6

WCAG

/25

19/25

6.17:1 min contrast

Performance

/25

14/25

2 fonts

Heading Font

Helvetica

Sans32px

Body Font

Georgia

Serif16px

Contrast Ratio

6.17:1

WCAG AA (≥4.5:1)

Reading Comfort

~37 CPL

Narrow lines

32px

24px

19px

13px

16px

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

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

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 6.2:1).

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

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

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

Buy on MyFontsFlesch 25

Color Palette

8 unique colors

Light

#a49a94

Secondary· 6.5%

#f0f0e6

Primary· 61.800000000000004%

#4e2322

Secondary· 6.4%

#e2e2da

Secondary· 4.5%

#604d4a

Secondary· 3.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

9 Resources

Scripts

Styles

Async

Defer

Top Script Sources

js(4)google-analytics.com(1)ssl.google-analytics.com(1)

Website Identity