W3cschool.cn Site Title
w3cschool官网 - 1000多本编程教程免费学
W3cschool.cn Meta 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。
W3cschool.cn Test Results
w3cschool.cn Mobile Usability: 100/100
w3cschool.cn Mobile Speed: 56/100
Quick overview:
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 4 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
https://g.alicdn.com/sj/lib/zepto/zepto.min.js
...
Optimize CSS Delivery of the following:
https://g.alicdn.com/msui/sm/0.6.1/css/sm.min.css
...
Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://w3cschool.cn/
...
Prioritize visible content
Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.
Only about 42% of the final above-the-fold content could be rendered with the full HTML response.
...
Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
https://www.w3cschool.cn/statics/css/m.css (2 hours)
...
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 1.5KiB (11% reduction).
Compressing https://7n.w3cschool.cn/attachments/collection/cover_collection_2532_25874_1538035283.png?t=1538035286 could save 1.5KiB (11% reduction).
Minify JavaScript
Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.
Minify JavaScript for the following resources to reduce their size by 906B (26% reduction).
Minifying https://7nsts.w3cschool.cn/js/m.js could save 906B (26% reduction) after compression.
Minify CSS
Compacting CSS code can save many bytes of data and speed up download and parse times.
Minify CSS for the following resources to reduce their size by 395B (15% reduction).
Minifying https://www.w3cschool.cn/statics/css/m.css could save 395B (15% reduction) after compression.
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