w3school.com.cn
W3School 在线教程
Last scanned Jul 26, 2026, 5:17 AM
Overall score
Fair
Summary
提供结构清晰、通俗易懂的 Web 开发教程，内含海量实战示例，涵盖 HTML、CSS、JavaScript、SQL、Python、PHP、Bootstrap、Java、XML 等多种技术。. This website uses Google Analytics hosted on ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance good (80/100). Top issue: Meta description longer than 160 characters.
提供结构清晰、通俗易懂的 Web 开发教程，内含海量实战示例，涵盖 HTML、CSS、JavaScript、SQL、Python、PHP、Bootstrap、Java、XML 等多种技术。
- China
- Hosted on ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN
Top issues to fix
11 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Slow estimated load (6.2s)
PerformanceUse a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
+5 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
6.20 s
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
提供结构清晰、通俗易懂的 Web 开发教程，内含海量实战示例，涵盖 HTML、CSS、JavaScript、SQL、Python、PHP、Bootstrap、Java、XML 等多种技术。
Meta tags
- Title
- W3School 在线教程
- Description
- 提供结构清晰、通俗易懂的 Web 开发教程，内含海量实战示例，涵盖 HTML、CSS、JavaScript、SQL、Python、PHP、Bootstrap、Java、XML 等多种技术。
- Canonical
- Language
- zh-cn
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- all
- Manifest
- https://www.w3school.com.cn/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN
- CDN provider
- —
- IP address
- 120.55.40.41
- ASN
- AS37963 (ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- DigiCert Inc
- Subject
- www.w3school.com.cn
- Valid from
- Jul 19, 2026
- Valid to
- Jan 19, 2027
- Days until expiry
- 177
- SAN domains
- www.w3school.com.cn, w3school.com.cn
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 42 · H3 0
Links
72 internal · 4 external · 1 broken
Images
3 total · 0 missing alt
Scripts / Styles
7 scripts · 7 stylesheets
JS / CSS size
177 KB · 58.2 KB
Page size
26.4 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- Missing canonical link
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://w3school.com.cn
- Final URL
- https://www.w3school.com.cn/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 6.20 s
- HTML size
- 26.4 KB
- Redirect chain
- https://w3school.com.cn → https://www.w3school.com.cn/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does w3school.com.cn use?
- w3school.com.cn is built with Google Analytics.
- Is w3school.com.cn secure (HTTPS)?
- Yes. w3school.com.cn uses TLS 1.2 with a certificate issued by DigiCert Inc, valid until Jan 19, 2027.
- Who hosts w3school.com.cn?
- w3school.com.cn is hosted on ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN.
- What is w3school.com.cn's SEO score?
- w3school.com.cn scored 70/100 for SEO in the latest analysis (fair).
- What is w3school.com.cn's overall website score?
- w3school.com.cn has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card