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khanacademy.org Mobile Performance
24/100
These metrics represent real-world Chrome users experience viewing khanacademy.org on mobile devices. 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
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Metrics
Largest Contentful Paint0/100 16.7 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Total Blocking Time0/100 2,820 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive4/100 17.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index40/100 6.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint82/100 2.7 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (12)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 566 KiB
2,990 ms
Serve images in next-gen formats
Potential savings of 14 KiB
180 ms
Eliminate render-blocking resources
Potential savings of 180 ms
180 ms
Defer offscreen images
Potential savings of 38 KiB
150 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Ensure text remains visible during webfont load
Minimize main-thread work
14.4 s
Reduce JavaScript execution time
10.4 s
Avoids an excessive DOM size
811 elements
Avoid long main-thread tasks
19 long tasks found
Keep request counts low and transfer sizes small
115 requests • 1,977 KiB
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
6 chains found
Passed Audits (16)
Uses passive listeners to improve scrolling performance
Avoids enormous network payloads
Total size was 1,974 KiB
Preload key requests
Remove unused CSS
Potential savings of 13 KiB
Avoids `document.write()`
Avoid multiple page redirects
Potential savings of 630 ms
Minify CSS
Potential savings of 3 KiB
Properly size images
Uses efficient cache policy on static assets
2 resources found
Efficiently encode images
Initial server response time was short
Root document took 70 ms
Use video formats for animated content
Preconnect to required origins
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Minify JavaScript
Enable text compression
khanacademy.org Mobile SEO
91/100
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.
Links do not have descriptive text
1 link found
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.
Tap targets are not sized appropriately
95% appropriately sized tap targets
Passed Audits (11)
Links are crawlable
Document uses legible font sizes
96.09% legible text
Document has a meta description
Document has a valid `hreflang`
Image elements have `[alt]` attributes
Page isn’t blocked from indexing
Page has successful HTTP status code
Document has a `<title>` element
robots.txt is valid
Document avoids plugins
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
khanacademy.org Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of khanacademy.org mobile 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 (3)
Trust and Safety
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
5 vulnerabilities detected
General
Browser errors were logged to the console
Passed Audits (11)
Displays images with correct aspect ratio
Avoids Application Cache
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
Avoids deprecated APIs
Allows users to paste into password fields
Properly defines charset
Detected JavaScript libraries
Links to cross-origin destinations are safe
Avoids requesting the geolocation permission on page load
Page has the HTML doctype
khanacademy.org Mobile Progressive Web App
25/100
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
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
PWA Optimized
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Fast and reliable
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 17.9 s
`start_url` does not respond with a 200 when offline
Passed Audits (5)
Provides a valid `apple-touch-icon`
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Content is sized correctly for the viewport
khanacademy.org Mobile Accessibility
88/100
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 (2)
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children.
Best practices
These items highlight common accessibility best practices.
`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
Passed Audits (24)
Form elements have associated labels
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
The page contains a heading, skip link, or landmark region
`[aria-*]` attributes have valid values
No element has a `[tabindex]` value greater than 0
`[lang]` attributes have a valid value
Links have a discernible name
Image elements have `[alt]` attributes
`[role]` values are valid
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[aria-hidden="true"]` elements do not contain focusable descendents
`[aria-*]` attributes are valid and not misspelled
Heading elements appear in a sequentially-descending order
Document has a `<title>` element
`[aria-hidden="true"]` is not present on the document `<body>`
Background and foreground colors have a sufficient contrast ratio
`[aria-*]` attributes match their roles
ARIA IDs are unique
`<html>` element has a valid value for its `[lang]` attribute
`[role]`s are contained by their required parent element
`[role]`s have all required `[aria-*]` attributes
Buttons have an accessible name
`[id]` attributes on active, focusable elements are unique
`<html>` element has a `[lang]` attribute
Mobile Usability
100/100
These checks validate how easily a visitor can use khanacademy.org on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Passed Audits (5)
Avoid plugins
Configure the viewport
Size content to viewport
Size tap targets appropriately
Use legible font sizes
Mobile Speed
46/100
These checks analyze the performance of khanacademy.org on mobile devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (6)
Leverage browser caching
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Prioritize visible content
Optimize images
Minify JavaScript
Minify CSS
Passed Audits (4)
Avoid landing page redirects
Enable compression
Reduce server response time
Minify HTML
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