Who.int WHO | World Health Organization
WHO's primary role is to direct international health within the United Nations' system and to lead partners in global health responses.
who.int Mobile Performance
18/100
These metrics represent real-world Chrome users experience viewing who.int 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
First Input Delay
First Contentful Paint
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Total Blocking Time0/100 2,980 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Largest Contentful Paint1/100 9.1 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive7/100 15.5 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index18/100 8.5 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint59/100 3.6 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 (18)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Serve images in next-gen formats
Potential savings of 808 KiB
4,350 ms
Remove unused JavaScript
Potential savings of 720 KiB
3,520 ms
Remove unused CSS
Potential savings of 132 KiB
1,350 ms
Eliminate render-blocking resources
Potential savings of 1,320 ms
1,320 ms
Avoid multiple page redirects
Potential savings of 1,260 ms
1,260 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Reduce the impact of third-party code
Third-party code blocked the main thread for 1,830 ms
Does not use passive listeners to improve scrolling performance
Ensure text remains visible during webfont load
Minimize main-thread work
9.3 s
Avoid an excessive DOM size
2,285 elements
Serve static assets with an efficient cache policy
66 resources found
Reduce JavaScript execution time
6.2 s
Avoid enormous network payloads
Total size was 3,406 KiB
Keep request counts low and transfer sizes small
112 requests • 3,406 KiB
Avoid chaining critical requests
24 chains found
Avoid long main-thread tasks
15 long tasks found
User Timing marks and measures
5 user timings
Largest Contentful Paint element
1 element found
Passed Audits (11)
Minify JavaScript
Efficiently encode images
Initial server response time was short
Root document took 30 ms
Preconnect to required origins
Avoids `document.write()`
Properly size images
Minify CSS
Preload key requests
Defer offscreen images
Potential savings of 578 KiB
Enable text compression
Use video formats for animated content
who.int Mobile SEO
93/100
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 (1)
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
3 links found
Passed Audits (13)
robots.txt is valid
Page isn’t blocked from indexing
Image elements have `[alt]` attributes
Document has a meta description
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document has a valid `rel=canonical`
Document has a `<title>` element
Links are crawlable
Document uses legible font sizes
100% legible text
Page has successful HTTP status code
Document has a valid `hreflang`
Document avoids plugins
Tap targets are sized appropriately
100% appropriately sized tap targets
who.int Mobile Best Practices
62/100
These checks highlight opportunities to improve the overall code health of who.int 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 (5)
General
Browser errors were logged to the console
User Experience
Displays images with incorrect aspect ratio
Trust and Safety
Links to cross-origin destinations are unsafe
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Does not use HTTPS
2 insecure requests found
Passed Audits (9)
Detected JavaScript libraries
Properly defines charset
Page has the HTML doctype
Allows users to paste into password fields
Avoids deprecated APIs
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
Avoids requesting the geolocation permission on page load
Avoids Application Cache
who.int Mobile Progressive Web App
21/100
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 (10)
Installable
Web app manifest does not meet the installability requirements
Does not use HTTPS
2 insecure requests found
Does not register a service worker that controls page and `start_url`
Fast and reliable
Page load is not fast enough on mobile networks
Interactive at 15.5 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
PWA Optimized
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Does not provide a valid `apple-touch-icon`
Manifest doesn't have a maskable icon
Passed Audits (4)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Content is sized correctly for the viewport
Contains some content when JavaScript is not available
who.int Mobile Accessibility
90/100
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 (3)
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.
Links do not have a discernible name
Buttons do not have an accessible name
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (21)
ARIA IDs are unique
`<html>` element has a valid value for its `[lang]` attribute
`[role]`s have all required `[aria-*]` attributes
`<frame>` or `<iframe>` elements have a title
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[aria-*]` attributes match their roles
Image elements have `[alt]` attributes
`[aria-hidden="true"]` is not present on the document `<body>`
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
Document has a `<title>` element
`[role]` values are valid
`<html>` element has a `[lang]` attribute
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
The page contains a heading, skip link, or landmark region
`[role]`s are contained by their required parent element
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`[aria-*]` attributes have valid values
Heading elements appear in a sequentially-descending order
No element has a `[tabindex]` value greater than 0
Mobile Usability
98/100
These checks validate how easily a visitor can use who.int 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).
Should Fix (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
28/100
These checks analyze the performance of who.int 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 (8)
Enable compression
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Optimize images
Leverage browser caching
Avoid landing page redirects
Minify JavaScript
Minify CSS
Minify HTML
Passed Audits (2)
Reduce server response time
Prioritize visible content
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