changeducation.cn

https://changeducation.cn· First analyzed 01 Jun 2026· Updated 01 Jun 2026

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changeducation.cn

Mobile

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Hosting Provider

Shanghai UCloud Information Technology Company Limited

IP Address

106.75.224.77

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇳 Yangpu, China

ASN

AS17621

Organization

Shanghai UCloud Information Technology Company Limited

Server

Nginx

Nameservers

dns13.hichina.com.dns14.hichina.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.9 s10%

Speed Index

2.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.9 MB

89 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Shanghai UCloud Information Technology Company Limited

Technology Stack

2 Technologies Detected

Other

D3.js

Web Servers

Nginxv1.16.1

SEO Analysis

F32/100

Meta Tags4/15

Content5/12

Headings3/8

Technical8/21

E-E-A-T0/7

Images1/7

Links2/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

changeducation.cnchangeducation.cn

擎课堂PRO

No description available for this page.

Title Length6 chars

Recommended: 50-60 chars (~40px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (4)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (26/26) — critical for accessibility and SEO

16 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

F26/100

Bot Access

20/25

Machine Read.

3/25

Schema Data

0/25

Citation

3/25

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:3%

Words:85

Token eff.:Too Short

Sections/1K:70

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.6w

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.

58/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

Semantic Structure

11/20

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

12/15

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.

24/100

238 mg

CO₂e / view

1.9 MB

Page Weight

50%

Cleaner Than

New Visitor

272 mg

Returning (cached)

136 mg

Annual (10K/mo)

28.6 kg

Emission Segments

Data Center

53 mg

Network

57 mg

Device

128 mg

Resource Breakdown

JavaScript

657.7 KB

Images

767.4 KB

CSS

479.9 KB

HTML

1.8 KB

Other

19.5 KB

Green Hosting Not Verified

Shanghai UCloud Information Technology Company Limited

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

148d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Beijing Xinchacha Credit Management Co., Ltd.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

27.10.2025

Valid Until

27.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.qingsteam.cnqingsteam.cn

SHA-256 Fingerprint

BF:16:A5:4F:36:65:77:F5:3F:6F:A0:97:DF:2F:0B:D8:5C:49:2A:CF...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Mon, 01 Jun 2026 01:44:06 GMT

last-modified

Thu, 20 Apr 2023 08:58:10 GMT

server

nginx/1.16.1

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (3)

mx3.qiye.aliyun.com

mx1.qiye.aliyun.com

mx2.qiye.aliyun.com

Domain Information

changeducation.cn

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.

38/100

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

Microsoft Yahei

WCAG Partial

59/100

Readability

/30

24/30

16px · LH 1.50

Hierarchy

/20

7/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Microsoft Yahei

Sans

Body Font

Microsoft Yahei

Sans16px

Contrast Ratio

1:1

19 issues

Reading Comfort

~52 CPL

Optimal (45–75)

24px

20px

16px

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

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

✅ Optimal line length: ~52 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 19 elements below WCAG AA threshold (min 1.0:1).

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

✅ Lean font stack: 1 font families keeps load times fast.

Buy on MyFonts

Color Palette

12 unique colors

Light

#ffffff

Background· 54%

#8b42e2

Primary· 6.2%

#af93e9

Accent· 6.2%

#8e70e1

Accent· 5.2%

#e36deb

Accent· 5%

#cebeeb

Accent· 4.3%

#eeedf1

Secondary· 4.1%

#5c38aa

Secondary· 3.5%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(5)hm.baidu.com(1)

Website Identity

changeducation.cn

Location detected: 🇨🇳 Chinavia tld

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Last analyzed: 01 Jun 2026 at 01:44

Historical Analysis & Change Tracking