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w3cschool.cn

w3cschool官网 - 1000多本编程教程免费学

Last scanned Aug 5, 2026, 4:00 AM · 10 views

79

Overall score

Fair

Summary

w3cschool启用中文品牌名--编程狮，是一个专业的W3C前端开发及编程入门学习平台，提供包括HTML,CSS,Javascript,jQuery,C,PHP,Java,Python,Sql,Mysql等编程语言和开源技术的在线教程��… This website uses PHP. SEO is fair (70/100) and accessibility is excellent (95/100). Security scores fair (65/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.

w3cschool启用中文品牌名--编程狮，是一个专业的W3C前端开发及编程入门学习平台，提供包括HTML,CSS,Javascript,jQuery,C,PHP,Java,Python,Sql,Mysql等编程语言和开源技术的在线教程及使用手册，是类国外w3schools的W3C学习社区及菜鸟编程平台。

Top issues to fix

12 issues found · 3 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 viewport meta tag

    Accessibility

    Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.

  • 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.

  • 7 cookies without Secure/HttpOnly flags

    Security

    Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

+6 more issues — details in the sections below.

70

SEO

5 issue(s) found

90

Performance

920 ms

65

Security

HTTPS & header checks

95

Accessibility

1 issue(s) found

Score history

-1 overall since Jul 27, 2026

Overall
79
SEO
70
Security
65
Performance
90
Accessibility
95

Organization

Company details published in this site's own structured data.

w3cschool启用中文品牌名--编程狮，是一个专业的W3C前端开发及编程入门学习平台，提供包括HTML,CSS,Javascript,jQuery,C,PHP,Java,Python,Sql,Mysql等编程语言和开源技术的在线教程及使用手册，是类国外w3schools的W3C学习社区及菜鸟编程平台。

Contact

Email, phone, and address published on this site's own pages.

Meta tags

Title
w3cschool官网 - 1000多本编程教程免费学
Description
w3cschool启用中文品牌名--编程狮，是一个专业的W3C前端开发及编程入门学习平台，提供包括HTML,CSS,Javascript,jQuery,C,PHP,Java,Python,Sql,Mysql等编程语言和开源技术的在线教程及使用手册，是类国外w3schools的W3C学习社区及菜鸟编程平台。
Canonical
https://www.w3cschool.cn
Language
zh
Charset
UTF-8
Viewport
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

PHPjQuery

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 1.3
Issuer
Asseco Data Systems S.A.
Subject
*.w3cschool.cn
Valid from
Apr 13, 2026
Valid to
Oct 29, 2026
Days until expiry
84
SAN domains
*.w3cschool.cn, w3cschool.cn

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 7 cookie(s) observed

Content & assets

Headings

H1 1 · H2 5 · H3 44

Links

370 internal · 25 external · 20 broken

Images

325 total · 20 missing alt

Scripts / Styles

9 scripts · 3 stylesheets

JS / CSS size

15.1 KB · 8.6 KB

Page size

247 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
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • Missing viewport meta tag

Scan details

Requested URL
https://w3cschool.cn
Final URL
https://www.w3cschool.cn/
HTTP status
200
HTTP version
HTTP/2
Response time
915 ms
HTML size
247 KB
Redirect chain
https://w3cschool.cn → https://www.w3cschool.cn/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does w3cschool.cn use?
w3cschool.cn is built with PHP, jQuery.
Is w3cschool.cn secure (HTTPS)?
Yes. w3cschool.cn uses TLS 1.3 with a certificate issued by Asseco Data Systems S.A., valid until Oct 29, 2026.
Who hosts w3cschool.cn?
Hosting provider information for w3cschool.cn is not available yet.
What is w3cschool.cn's SEO score?
w3cschool.cn scored 70/100 for SEO in the latest analysis (fair).
What is w3cschool.cn's overall website score?
w3cschool.cn has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.
Has w3cschool.cn's score changed over time?
w3cschool.cn's overall score has declined by 1 point (from 80 to 79) since Jul 27, 2026.