Chsi.com.cn 中国高等教育学生信息网（学信网）
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chsi.com.cn Desktop Performance
97/100
These metrics represent real-world Chrome users experience viewing chsi.com.cn web page. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
First Input Delay
Largest Contentful Paint
Cumulative Layout Shift
First Contentful Paint
Metrics
Speed Index86/100 1.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint95/100 1.0 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint99/100 0.6 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Total Blocking Time100/100 40 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Time to Interactive100/100 0.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Should Fix (7)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Reduce initial server response time
Root document took 740 ms
138 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Avoid `document.write()`
Serve static assets with an efficient cache policy
21 resources found
Keep request counts low and transfer sizes small
28 requests • 280 KiB
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
4 chains found
Avoid long main-thread tasks
2 long tasks found
Passed Audits (21)
Properly size images
Minimizes main-thread work
0.6 s
Avoids enormous network payloads
Total size was 280 KiB
Serve images in next-gen formats
Potential savings of 63 KiB
Remove unused JavaScript
Potential savings of 24 KiB
JavaScript execution time
0.0 s
Preload key requests
Remove unused CSS
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Enable text compression
Potential savings of 26 KiB
Use video formats for animated content
Uses passive listeners to improve scrolling performance
Efficiently encode images
Potential savings of 28 KiB
Minify CSS
Defer offscreen images
Potential savings of 22 KiB
All text remains visible during webfont loads
Avoids an excessive DOM size
422 elements
Avoid multiple page redirects
Potential savings of 190 ms
Preconnect to required origins
Eliminate render-blocking resources
Potential savings of 0 ms
Minify JavaScript
chsi.com.cn Desktop SEO
82/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (2)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Image elements do not have `[alt]` attributes
Mobile Friendly
Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. Learn more.
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
Passed Audits (9)
Links are crawlable
Document avoids plugins
Page has successful HTTP status code
Document has a meta description
robots.txt is valid
Document has a `<title>` element
Links have descriptive text
Page isn’t blocked from indexing
Document has a valid `hreflang`
chsi.com.cn Desktop Best Practices
85/100
These checks highlight opportunities to improve the overall code health of chsi.com.cn page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (2)
Trust and Safety
Does not use HTTPS
1 insecure request found
Links to cross-origin destinations are unsafe
Passed Audits (12)
Page has the HTML doctype
Avoids deprecated APIs
Properly defines charset
Avoids Application Cache
Detected JavaScript libraries
Avoids requesting the notification permission on page load
Serves images with appropriate resolution
No browser errors logged to the console
Avoids front-end JavaScript libraries with known security vulnerabilities
Avoids requesting the geolocation permission on page load
Allows users to paste into password fields
Displays images with correct aspect ratio
chsi.com.cn Desktop Progressive Web App
41/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (9)
Installable
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
PWA Optimized
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
Is not configured for a custom splash screen
Fast and reliable
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Passed Audits (4)
Provides a valid `apple-touch-icon`
Page load is fast enough on mobile networks
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
chsi.com.cn Desktop Accessibility
51/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (6)
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.
Form elements do not have associated labels
Image elements do not have `[alt]` attributes
`<frame>` or `<iframe>` elements do not have a title
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
`<html>` element does not have a `[lang]` attribute
Passed Audits (9)
`[aria-hidden="true"]` is not present on the document `<body>`
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
`[id]` attributes on active, focusable elements are unique
Document has a `<title>` element
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
The page contains a heading, skip link, or landmark region
Heading elements appear in a sequentially-descending order
Desktop Speed
93/100
These checks analyze the performance of chsi.com.cn on desktop devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (3)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Minify JavaScript
Passed Audits (7)
Avoid landing page redirects
Enable compression
Reduce server response time
Minify CSS
Minify HTML
Optimize images
Prioritize visible content
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