w3school.com.cn
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Hosting Provider
alibabacloud.comIP Address
120.55.40.41
Server Location
🇨🇳 Hangzhou, China
ASN
AS37963
Organization
Aliyun Computing Co., LTD
Server
Microsoft IIS
Nameservers
Performance
Page Speed
Architecture Stack
Technology Stack
4 Technologies Detected
SEO Analysis
w3school 在线教程
全球最大的中文 Web 技术教程。
Recommended: 50-60 chars
Recommended: 120-160 chars
Issues (1)
- • Missing viewport meta tag - page may not be mobile-friendly
7 issues found
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Security Score
HTTPS
No WAF
147d
Certificate Details
Type
Domain Validated (DV)
Certificate Authority
DigiCert Inc
Key Algorithm
RSA (2048 bit)
Signature
SHA-256 with RSA
TLS Version
TLSv1.2
HTTP Protocol
HTTP/2
Valid From
16.07.2025
Valid Until
15.07.2026
OCSP Stapling
Enabled
Subject Alternative Names (2)
SHA-256 Fingerprint
DE:74:C1:08:81:61:3A:29:93:5A:80:A7:FA:1D:56:02:1E:E4:48:47...
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HTTP Headers
Developer Console
Email Infrastructure
Custom Mail Server
Score
20
MX Records (2)
Domain Information
w3school.com.cn
Privacy & Compliance
GDPR Indicators
Typography & Readability
SF Pro SC + 微软雅黑
18px · LH 1.50
1.56x ratio
Contrast: undefined
2 fonts
Heading Font
SF Pro SC
Body Font
微软雅黑
Contrast Ratio
--
Reading Comfort
~140 CPL
Needs attention✅ Excellent readability: 18px body text is ideal for all devices.
✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.
✅ Good hierarchy: Clear distinction between headlines and body text.
✅ Good performance: Using 2 font families keeps load times fast.
⚠️ Risky: Text appears on background images without overlay protection.
❌ Very long lines: ~140 chars/line causes eye strain. Use max-width: 65ch.
Business & Marketing Stack
2 Tools Detected
1
Categories
2
Total Tools
0
Enterprise
0
Mid-Market
Assessment: Growing marketing technology adoption
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Scripts & Styles
4 Resources
Top Script Sources
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Historical Analysis & Change Tracking