24.4 sec in total
531 ms
23.1 sec
771 ms
Click here to check amazing W 3 Cschool content for China. Otherwise, check out these important facts you probably never knew about w3cschool.cn
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。
Visit w3cschool.cnWe analyzed W3cschool.cn page load time and found that the first response time was 531 ms and then it took 23.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.
w3cschool.cn performance score
name
value
score
weighting
Value2.6 s
62/100
10%
Value9.2 s
1/100
25%
Value9.1 s
13/100
10%
Value360 ms
72/100
30%
Value0
100/100
15%
Value4.6 s
81/100
10%
531 ms
1273 ms
232 ms
465 ms
684 ms
Our browser made a total of 384 requests to load all elements on the main page. We found that 7% of them (25 requests) were addressed to the original W3cschool.cn, 89% (341 requests) were made to Atts.w3cschool.cn and 5% (18 requests) were made to 7n.w3cschool.cn. The less responsive or slowest element that took the longest time to load (4.7 sec) relates to the external source Atts.w3cschool.cn.
Page size can be reduced by 1.9 MB (18%)
10.3 MB
8.4 MB
In fact, the total size of W3cschool.cn main page is 10.3 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 9.9 MB which makes up the majority of the site volume.
Potential reduce by 189.2 kB
HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 189.2 kB or 85% of the original size.
Potential reduce by 1.6 MB
Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Obviously, W 3 Cschool needs image optimization as it can save up to 1.6 MB or 17% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 37.2 kB
It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 37.2 kB or 33% of the original size.
Potential reduce by 4.3 kB
CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. W3cschool.cn needs all CSS files to be minified and compressed as it can save up to 4.3 kB or 21% of the original size.
Number of requests can be reduced by 4 (1%)
381
377
The browser has sent 381 CSS, Javascripts, AJAX and image requests in order to completely render the main page of W 3 Cschool. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.
w3cschool.cn
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www.w3cschool.cn
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w3cschool.cn accessibility score
Names and labels
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
Buttons do not have an accessible name
Form elements do not have associated labels
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
w3cschool.cn best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Displays images with incorrect aspect ratio
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
w3cschool.cn SEO score
ZH
ZH
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise W3cschool.cn can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and it matches the claimed language. Our system also found out that W3cschool.cn main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.
w3cschool.cn
Open Graph description is not detected on the main page of W 3 Cschool. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: