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w3school.com.cn

W3School 在线教程

Last scanned Aug 2, 2026, 11:00 PM · 5 views

82

Overall score

Great

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. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). 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。

Top issues to fix

10 issues found · 2 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • Meta description longer than 160 characters

    SEO

    Trim the meta description to under 160 characters to avoid truncation in search results.

  • Missing canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

+4 more issues — details in the sections below.

70

SEO

5 issue(s) found

100

Performance

527 ms

65

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

+5 overall since Jul 26, 2026

Overall
82
SEO
70
Security
65
Performance
100
Accessibility
100

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

OpenGraph & Twitter Card

OpenGraph

og:title
W3School.com.cn
og:description
W3School 提供涵盖所有主流 Web 开发语言的免费在线教程、参考手册和练习题。内容包含 HTML、CSS、JavaScript、Python、SQL、Java 等众多热门技术领域。
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Google Analytics

Hosting & CDN

Hosting provider
—
CDN provider
—
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

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
170
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 · 20 broken

Images

3 total · 0 missing alt

Scripts / Styles

5 scripts · 7 stylesheets

JS / CSS size

152 B · 5.1 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
527 ms
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?
Hosting provider information for w3school.com.cn is not available yet.
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 82/100, combining SEO, performance, security, and accessibility.
Has w3school.com.cn's score changed over time?
w3school.com.cn's overall score has improved by 5 points (from 77 to 82) since Jul 26, 2026.