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21cnjy.com

https://21cnjy.com· First analyzed 11 May 2026· Updated 11 May 2026
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21cnjy.com
Desktop screenshot of 21cnjy.com
Mobile screenshot of 21cnjy.com
Mobile

Sponsored

Hosting Provider

China Mobile

IP Address

117.169.66.187

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Jinrongjie, China

ASN

AS56045

Organization

China Mobile

Nameservers

ns3.dnsv2.com.ns4.dnsv2.com.

Performance

80

Core Web Vitals

Weight

First Contentful Paint
2.3 s10%
Speed Index
3.0 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
4.4 MB
145 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
China Mobile

Technology Stack

4 Technologies Detected

Libraries

1
jQueryv1.12.4

Other

1
Polyfill.io

CSS Frameworks

1
Tailwind CSS

Analytics

1
Microsoft Clarity

SEO Analysis

D47/100
11
12
2
Meta Tags10/15
Content8/12
Headings3/8
Technical11/21
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
2
21cnjy.com21cnjy.com

21世纪教育网（二一教育）-试题,课件,教案,学案、高中考资源下载

国内排名前列的中小学教育资源网，提供全国中小学各版本教材的课件教案学案备课素材试卷练习等资源下载。资源多、时效强、质量高，是中小学老师学生们的最佳选择

Title Length33 chars

Recommended: 50-60 chars (~195px / 580px)

Description Length75 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (45/78) — critical for accessibility and SEO

14 issues found

Upgrade to view details

Local SEO

Local Search Readiness

11/100
Poor
3 12 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F32/100
Bot Access
20/25
Machine Read.
7/25
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:1%
Words:2,846
Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headingsavg 1w
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...
Upgrade to view recommendations

Sponsored

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.
D
48/100
5
Passed
8
Critical
1
Warnings
Images & Alt Text
10/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
7/20
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
5/15
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...
Upgrade to view recommendations

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.
9/100
F
561 mg
CO₂e / view
4.4 MB
Page Weight
15%
Cleaner Than
New Visitor
642 mg
vs
Returning (cached)
321 mg
Annual (10K/mo)
67.4 kg
Emission Segments
Data Center
125 mg
Network
135 mg
Device
301 mg
Resource Breakdown
JavaScript
335.6 KB
Images
3.4 MB
CSS
466.6 KB
HTML
243.0 KB
Other
8.8 KB
Green Hosting Not Verified
China Mobile
8 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

62d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-384 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

11.06.2025

Valid Until

12.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.21cnjy.com21cnjy.com

SHA-256 Fingerprint

B5:DD:A3:74:1A:5C:04:39:D5:3D:94:F2:8C:12:B3:2A:6E:6B:9B:F0...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-cache, no-store)
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=utf-8
date
Mon, 11 May 2026 23:58:39 GMT
eagleid
b4a3921d17785439194212414e
pragma
no-cache
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

50

SPF
DKIM
DMARC

MX Records (2)

mxbiz2.qq.com
mxbiz1.qq.com

Domain Information

21cnjy.com

Domain Age
19y 9m

Created

15.08.2006

Expires

15.08.2027

Last Updated

16.07.2024

Registrar

Bizcn.com, Inc.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

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.
D
53/100
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,maximum-scale=1
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Microsoft Yahei

WCAG Partial
41/100
Readability
/30
6/30

12px · LH 2.50

Hierarchy
/20
7/20
WCAG
/25
14/25

2.3:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Microsoft Yahei

Sans

Body Font

Microsoft Yahei

Sans12px

Contrast Ratio

2.3:1

7 issues

Reading Comfort

~182 CPL

Too wide
24px
h2
16px
h3
12px
p

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Wide line spacing (2.50). 1.4–1.6 is optimal for body text.

❌ Very long lines: ~182 chars/line causes eye strain. Add max-width constraint.

✅ Easy to read: Flesch score 100/100 — accessible to general audiences.

⚠️ Partial contrast: 7 elements below WCAG AA threshold (min 2.3:1).

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

Buy on MyFontsFlesch 100

Color Palette

7 unique colors
2.76:1 Fail Light
#8c8c8c
Other· 52.800000000000004%
#e7e9ea
Other· 11.5%
#5f5e7c
Primary· 9%
#8a816d
Secondary· 8.7%
#4a447c
Secondary· 5.2%
#a4a3b3
Secondary· 4.3%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

2
Microsoft ClarityFree
Google AnalyticsFree

User behavior and product analytics

1

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

26 Resources

20
Scripts
6
Styles
5
Async
2
Defer

Top Script Sources

hm.baidu.com(5)static.21cnjy.com(4)local(4)e.so.com(1)hmcdn.baidu.com(1)

Website Identity

21cnjy.com

19 years old
Location detected: 🇨🇳 Chinavia ip
Bizcn.com, Inc.zh-CN

Sponsored

Last analyzed: 11 May 2026 at 23:59

Historical Analysis & Change Tracking