i21st.cn

https://i21st.cn· First analyzed 24 May 2026· Updated 24 May 2026

Export

i21st.cn

Mobile

Sponsored

Hosting Provider

China Mobile

IP Address

111.13.49.203

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇳 Guangzhou, China

ASN

AS9808

Organization

China Mobile

Server

Nginx

Nameservers

vip3.alidns.com.vip4.alidns.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%

139 KB

43 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

China Mobile

Technology Stack

2 Technologies Detected

Libraries

jQuery

Web Servers

Nginx

SEO Analysis

D47/100

Meta Tags7/15

Content8/12

Headings8/8

Technical9/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

i21st.cni21st.cn

21英语网-21世纪报官方网站

21英语网是极具原创性的英语学习和教学网站，拥有独家的英语学习资料及教育资料，专注于打造最具人气的英语学习交流平台，为全国英语学习者和教育者提供专业服务。

Title Length15 chars

Recommended: 50-60 chars (~88px / 580px)

Description Length77 chars

Recommended: 120-160 chars

Issues (2)

• Most images missing alt text (15/17) — critical for accessibility and SEO
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

13 issues found

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Crawlability

Sitemap

robots.txt

14 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.

Sponsored

AI & LLM Readiness

F28/100

Bot Access

20/25

Machine Read.

2/25

Schema Data

0/25

Citation

6/25

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:7%

Words:287

Token eff.:Too Short

Sections/1K:230

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 2w

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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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.

47/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

9/20

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

7/15

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.

3 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.

53/100

A+

17 mg

CO₂e / view

139.4 KB

Page Weight

95%

Cleaner Than

New Visitor

20 mg

Returning (cached)

10 mg

Annual (10K/mo)

2.1 kg

Emission Segments

Data Center

4 mg

Network

4 mg

Device

9 mg

Resource Breakdown

JavaScript

70.4 KB

Images

3.3 KB

CSS

54.1 KB

HTML

11.1 KB

Other

556 B

Green Hosting Not Verified

China Mobile

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

278d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

26.01.2026

Valid Until

27.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.i21st.cni21st.cn

SHA-256 Fingerprint

91:DC:26:90:61:81:70:AC:2F:4B:C1:E9:29:F6:61:61:FD:70:BB:AF...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Sun, 24 May 2026 17:49:30 GMT

etag

W/"6a1234f5-8eee"

last-modified

Sat, 23 May 2026 23:15:01 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mx.i21st.cn

Domain Information

i21st.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.

21/100

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.

6 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Georgia

WCAG Partial

59/100

Readability

/30

17/30

13px · LH 1.60

Hierarchy

/20

14/20

1.54x ratio · ✓ H1→H6

WCAG

/25

14/25

2.99:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Georgia

Serif20px

Body Font

Georgia

Serif13px

Contrast Ratio

2.99:1

5 issues

Reading Comfort

Single Font Family

left aligned

20px

16px

13px

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

✅ Easy to read: Flesch score 78/100 — accessible to general audiences.

⚠️ Partial contrast: 5 elements below WCAG AA threshold (min 3.0:1).

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

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

Buy on MyFontsFlesch 78

Color Palette

8 unique colors

2.63:1 Fail Light

#ffffff

Background· 57.60000000000001%

#a69e9d

Other· 4.9%

#f0dcb4

Primary· 10.899999999999999%

#9fc6e1

Accent· 8%

#715743

Secondary· 5.7%

#e9e8df

Secondary· 5.4%

#bde2f1

Accent· 4.3%

#dacbb4

Secondary· 3.4%

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)i21st.cn(2)hm.baidu.com(1)

Website Identity

i21st.cn

Location detected: 🇨🇳 Chinavia tld

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Last analyzed: 24 May 2026 at 17:49

Historical Analysis & Change Tracking