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45 w3school.com.cn Last Updated: 1 year

Success 62% of passed verification steps
Warning 23% of total warning
Errors 15% of total errors, require fast action
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Desktop

Mobile

Performance Desktop Score 87%
Best Practices Desktop Score 85%
SEO Desktop Score 88%
Progressive Web App Desktop Score 50%
Performance Mobile Score 87%
Best Practices Mobile Score 85%
SEO Mobile Score 70%
Progressive Web App Mobile Score 48%
Page Authority Authority 54%
Domain Authority Domain Authority 41%
Moz Rank 5.4/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: GBK
Title Tag 13 Characters
W3SCHOOL 在线教程
Meta Description 17 Characters
全球最大的中文 Web 技术教程。
Effective URL 27 Characters
https://www.w3school.com.cn
Excerpt Page content
w3school 在线教程 w3school 在线教程 HTML 系列教程 浏览器脚本 服务器脚本 编程教程 XML 系列教程 建站手册 参考手册 HTML 教程 HTML HTML5 XHTML CSS CSS3 TCP/IP 浏览器脚本 JavaScript HTML DOM jQuery...
Keywords Cloud Density
html16 w3school13 jquery7 javascript6 mobile3 python3 vbscript3 参考手册3 html53 请您阅读2
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
html 16
w3school 13
jquery 7
javascript 6
mobile 3
python 3
vbscript 3
参考手册 3
html5 3
请您阅读 2
Google Preview Your look like this in google search result
W3SCHOOL 在线教程
https://www.w3school.com.cn
全球最大的中文 Web 技术教程。
Robots.txt File No Found
http://w3school.com.cn/robots.txt
Sitemap.xml File No Found
http://w3school.com.cn/sitemap.xml
Whois Is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system
Updated: 1970-01-01 / 51 years
Create on: 1970-01-01 / 51 years
Expires on: 1970-01-01 / 625 months 4 days

Nameservers
dns7.hichina.com
dns8.hichina.com
Page Size Code & Text Ratio
Document Size: ~15.99 KB
Code Size: ~10.96 KB
Text Size: ~5.03 KB Ratio: 31.48%

Estimation Traffic and Earnings

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Technologies

PWA - Manifest

Manifest is not valid
Your site don't have valid manifest.json, read more in Web App Manifest

Desktop

Desktop Screenshot
Total Blocking Time 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.0 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Speed Index 2.1 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 0.8 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 93 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimizes main-thread work 0.3 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.8 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 1 chain found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoids an excessive DOM size 323 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 0.8 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 19 requests • 93 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Uses efficient cache policy on static assets 1 resource found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 50 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 0.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Estimated Input Latency 10 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Serve images in next-gen formats Potential savings of 21 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Reduce server response times (TTFB) Root document took 1,660 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 0 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Minimize third-party usage Third-party code blocked the main thread for 80 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading

Mobile

Mobile Screenshot
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Estimated Input Latency 80 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
First Contentful Paint (3G) 6079 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Serve images in next-gen formats Potential savings of 143 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Server response times are low (TTFB) Root document took 260 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 0 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Reduce the impact of third-party code Third-party code blocked the main thread for 1,050 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 50 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.2 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Speed Index 3.2 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 3.2 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 294 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimizes main-thread work 1.8 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 3.2 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 1 chain found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoids an excessive DOM size 323 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 3.2 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 19 requests • 294 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Uses efficient cache policy on static assets 1 resource found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 590 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 3.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive

Speed And Optimization Tips

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Alexa Rank

0

Local Rank: / Users: / PageViews:

Global Rank

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server 
HTTP/1.1 200 OK
Cache-Control: no-cache,no-cache
Content-Length: 4027
Content-Type: text/html
Content-Encoding: gzip
Last-Modified: Wed, 20 Nov 2019 02:21:13 GMT
Accept-Ranges: bytes
ETag: "80b2f82d499fd51:0"
Vary: Accept-Encoding
Server: Microsoft-IIS/10.0
X-Powered-By: ASP.NET
Date: Tue, 26 Nov 2019 11:13:57 GMT
DNS Records DNS Resource Records associated with a hostname
View DNS Records
Type Name Value Class TTL
A w3school.com.cn 120.55.40.41 IN 543
NS w3school.com.cn dns8.hichina.com IN 21599
NS w3school.com.cn dns7.hichina.com IN 21599
MX w3school.com.cn mxbiz1.qq.com IN 3599
MX w3school.com.cn mxbiz2.qq.com IN 3599

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