sduonline.cn

https://sduonline.cn· First analyzed 16 May 2026· Updated 16 May 2026

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sduonline.cn

Mobile

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Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.67.131.75

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

keyla.ns.cloudflare.com.henrik.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

539 ms10%

Speed Index

701 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.9 MB

10 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Nginxv1.28.0

SEO Analysis

F35/100

Meta Tags4/15

Content2/12

Headings0/8

Technical11/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

sduonline.cnsduonline.cn

i山大

No description available for this page.

Title Length3 chars

Recommended: 50-60 chars (~16px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (4)

• Missing meta description — important for click-through rates in SERPs
• Very thin content (11 words). Search engines need substantial content for ranking.
• Missing H1 tag — every page should have exactly one H1

11 issues found

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Crawlability

Sitemap

robots.txt

18 rules

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.

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AI & LLM Readiness

F16/100

Bot Access

15/25

Machine Read.

1/25

Schema Data

0/25

Citation

0/25

AI Bot Access

6/14 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:5%

Words:10

Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary

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 (12)

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.

48/100

Passed

Critical

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

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.

4 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

197 mg

CO₂e / view

1.9 MB

Page Weight

50%

Cleaner Than

New Visitor

225 mg

Returning (cached)

113 mg

Annual (10K/mo)

23.7 kg

Emission Segments

Data Center

10 mg

Network

58 mg

Device

130 mg

Resource Breakdown

Images

1.7 MB

CSS

204.8 KB

HTML

3.1 KB

Green Hosting Verified

Cloudflare

GWF Verified

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

332d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

12.03.2026

Valid Until

13.04.2027

OCSP Stapling

Enabled

Subject Alternative Names (6)

*.sdu.edu.cnowa.sdu.edu.cnmail.sdu.edu.cnautodiscover.sdu.edu.cnwww.sdu.edu.cnsdu.edu.cn

SHA-256 Fingerprint

50:56:B1:5E:AB:33:21:E6:70:B8:C7:48:68:C2:62:18:26:B2:6B:FB...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

connection

keep-alive

content-length

2854

content-type

text/html

date

Sat, 16 May 2026 02:09:29 GMT

etag

"6908aa9f-b26"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mxbiz1.qq.com

mxbiz2.qq.com

Domain Information

sduonline.cn

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.

61/100

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.

Viewport

width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

-apple-system

WCAG Partial

68/100

Readability

/30

21/30

16px · LH --

Hierarchy

/20

10/20

WCAG

/25

17/25

4.4:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

-apple-system

Body Font

-apple-system

Sans16px

Contrast Ratio

4.4:1

6 issues

Reading Comfort

Single Family

left aligned

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

⚠️ Partial contrast: 6 elements below WCAG AA threshold (min 4.4:1).

✅ System fonts: Zero font loading delay — best possible LCP impact.

Color Palette

4 unique colors

18.9:1 AAA Dark

#11110f

Text· 55.7%

#ffffff

Primary· 34.900000000000006%

#395148

Secondary· 4.8%

#e5eae2

Secondary· 4.7%

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Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

sduonline.cn

Location detected: 🇨🇳 Chinavia tld

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Last analyzed: 16 May 2026 at 02:09

Historical Analysis & Change Tracking