fedev.cn

https://fedev.cn· First analyzed 15 May 2026· Updated 15 May 2026

Export

fedev.cn

Mobile

Sponsored

Hosting Provider

Tencent Cloud

cloud.tencent.com

IP Address

175.27.228.200

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇳 Nanjing, China

ASN

AS45090

Organization

Tencent cloud computing (Beijing) Co., Ltd.

Server

Nginx

Nameservers

f1g1ns1.dnspod.net.f1g1ns2.dnspod.net.

Performance

Core Web Vitals

Weight

First Contentful Paint

735 ms10%

Speed Index

956 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

56 KB

16 requests

0–49

50–89

90–100

Architecture Stack

JAMstack

⚡ SSG

Frontend

Framework

Astrov5.16.6

Styling

Tailwind CSS

Infrastructure

Hosting

Tencent Cloud

Technology Stack

5 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Web Servers

SEO Analysis

C60/100

Meta Tags9/15

Content8/12

Headings3/8

Technical18/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social2/5

Freshness2/4

Mobile4/4

Indexability3/3

fedev.cnfedev.cn

前端开发者学堂 (fedev.cn) - 前端开发社区

前端开发者学堂致力于分享最新的CSS、HTML5、JavaScript、Node.js、Vue、React和动画等前端技术，提供丰富教程资源，帮助你提升前端开发能力。无论初学者还是经验丰富的开发者，共同学习、进步和分享，打造优秀的前端学习平台。

Title Length27 chars

Recommended: 50-60 chars (~165px / 580px)

Description Length122 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (12/14) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

7 URLs

robots.txt

5 rules

Sitemap reference found

Allows all crawlers

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

D43/100

Bot Access

20/25

Machine Read.

11/25

Schema Data

0/25

Citation

12/25

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

code blocksnavheader/footer

Text ratio:9%

Words:344

Token eff.:Optimal

Sections/1K:32

Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary17w

Descriptive Headingsavg 2.9w

Canonical URL

Open Graph2/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

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.

56/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

13/20

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

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

4/15

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.

60/100

A+

7 mg

CO₂e / view

56.1 KB

Page Weight

95%

Cleaner Than

New Visitor

8 mg

Returning (cached)

4 mg

Annual (10K/mo)

828 g

Emission Segments

Data Center

2 mg

Network

2 mg

Device

4 mg

Resource Breakdown

JavaScript

6.8 KB

Images

31.4 KB

CSS

8.3 KB

HTML

9.7 KB

Green Hosting Not Verified

Tencent Cloud

4 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

21%Critical

Interactive

HTTPS

No WAF

56d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

11.04.2026

Valid Until

10.07.2026

Subject Alternative Names (2)

fedev.cnwww.fedev.cn

SHA-256 Fingerprint

5F:5F:39:5B:9D:AB:85:64:30:5B:EB:77:2F:0D:4C:85:68:AF:9B:EC...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Fri, 15 May 2026 01:14:29 GMT

server

nginx

vary

Accept-Encoding

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

fedev.cn

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.

68/100

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

1 recommendation

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Apple Color Emoji

WCAG Partial

56/100

Readability

/30

19/30

18px · LH 2.00

Hierarchy

/20

6/20

WCAG

/25

17/25

1.18:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Apple Color Emoji

Sans

Body Font

Apple Color Emoji

Sans18px

Contrast Ratio

1.18:1

11 issues

Reading Comfort

~35 CPL

Narrow lines

24px

18px

Minor Second

Scale

✅ Excellent readability: 18px body text is ideal for all devices.

⚠️ Wide line spacing (2.00). 1.4–1.6 is optimal for body text.

❌ Very complex text: Flesch score 10/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 11 elements below WCAG AA threshold (min 1.2:1).

❌ 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 MyFontsFlesch 10

Color Palette

7 unique colors

Light

#ffffff

Text· 13.5%

#111828

Secondary· 51.199999999999996%

#202938

Secondary· 16.1%

#3f40c5

Primary· 6.3%

#030615

Primary· 4.8%

#303266

Secondary· 4.6%

#6f7d93

Secondary· 3.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

6 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)googletagmanager.com(1)hm.baidu.com(1)

Website Identity

fedev.cn

Location detected: 🇨🇳 Chinavia tld

zh-cn

Sponsored

Last analyzed: 15 May 2026 at 01:15

Historical Analysis & Change Tracking