Pbs.org PBS: Public Broadcasting Service
Watch full episodes of your favorite PBS shows, explore music and the arts, find in-depth news analysis, and more. Home to Antiques Roadshow, Frontlin...
pbs.org Mobile Performance
20/100
These metrics represent real-world Chrome users experience viewing pbs.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
First Contentful Paint
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
Metrics
Total Blocking Time1/100 2,370 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Largest Contentful Paint2/100 8.8 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive11/100 13.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index16/100 8.8 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint65/100 3.4 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 (20)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 441 KiB
2,250 ms
Avoid multiple page redirects
Potential savings of 1,260 ms
1,260 ms
Defer offscreen images
Potential savings of 124 KiB
450 ms
Properly size images
Potential savings of 80 KiB
420 ms
Remove unused CSS
Potential savings of 30 KiB
300 ms
Eliminate render-blocking resources
Potential savings of 150 ms
150 ms
Minify JavaScript
Potential savings of 9 KiB
120 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 450 ms
Does not use passive listeners to improve scrolling performance
Avoid `document.write()`
Minimize main-thread work
8.2 s
Serve static assets with an efficient cache policy
17 resources found
Reduce JavaScript execution time
5.5 s
Avoid an excessive DOM size
1,627 elements
Avoid chaining critical requests
13 chains found
Avoid long main-thread tasks
20 long tasks found
Avoid large layout shifts
2 elements found
Keep request counts low and transfer sizes small
79 requests • 1,650 KiB
User Timing marks and measures
9 user timings
Largest Contentful Paint element
1 element found
Passed Audits (10)
Serve images in next-gen formats
Potential savings of 23 KiB
Initial server response time was short
Root document took 130 ms
Use video formats for animated content
All text remains visible during webfont loads
Enable text compression
Minify CSS
Efficiently encode images
Avoids enormous network payloads
Total size was 1,650 KiB
Preload key requests
Preconnect to required origins
pbs.org Mobile SEO
90/100
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)
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
69% appropriately sized tap targets
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (12)
Document has a `<title>` element
Document uses legible font sizes
92.84% legible text
Document has a valid `rel=canonical`
Document has a valid `hreflang`
Page has successful HTTP status code
robots.txt is valid
Document has a meta description
Links have descriptive text
Page isn’t blocked from indexing
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document avoids plugins
Image elements have `[alt]` attributes
pbs.org Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of pbs.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 (4)
User Experience
Serves images with low resolution
General
Uses deprecated APIs
1 warning found
Browser errors were logged to the console
Trust and Safety
Does not use HTTPS
2 insecure requests found
Passed Audits (10)
Detected JavaScript libraries
Avoids requesting the geolocation permission on page load
Properly defines charset
Allows users to paste into password fields
Avoids Application Cache
Page has the HTML doctype
Avoids front-end JavaScript libraries with known security vulnerabilities
Avoids requesting the notification permission on page load
Links to cross-origin destinations are safe
Displays images with correct aspect ratio
pbs.org Mobile Progressive Web App
39/100
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 (6)
Installable
Does not use HTTPS
2 insecure requests found
Does not register a service worker that controls page and `start_url`
Fast and reliable
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 13.6 s
`start_url` does not respond with a 200 when offline
PWA Optimized
Manifest doesn't have a maskable icon
Passed Audits (8)
Web app manifest meets the installability requirements
Redirects HTTP traffic to HTTPS
Content is sized correctly for the viewport
Provides a valid `apple-touch-icon`
Contains some content when JavaScript is not available
Sets a theme color for the address bar.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Configured for a custom splash screen
pbs.org 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
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.
ARIA IDs are not unique
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (23)
Form elements have associated labels
Document has a `<title>` element
The page contains a heading, skip link, or landmark region
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
No element has a `[tabindex]` value greater than 0
`[role]` values are valid
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`<html>` element has a valid value for its `[lang]` attribute
`<html>` element has a `[lang]` attribute
Buttons have an accessible name
Heading elements appear in a sequentially-descending order
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`[role]`s are contained by their required parent element
`[id]` attributes on active, focusable elements are unique
`<frame>` or `<iframe>` elements have a title
`[aria-hidden="true"]` is not present on the document `<body>`
`[aria-*]` attributes have valid values
`[aria-*]` attributes are valid and not misspelled
`[aria-*]` attributes match their roles
`[aria-hidden="true"]` elements do not contain focusable descendents
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Image elements have `[alt]` attributes
`[role]`s have all required `[aria-*]` attributes
Mobile Usability
94/100
These checks validate how easily a visitor can use pbs.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).
Should Fix (2)
Size content to viewport
Size tap targets appropriately
Passed Audits (3)
Avoid plugins
Configure the viewport
Use legible font sizes
Mobile Speed
67/100
These checks analyze the performance of pbs.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 (3)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Optimize images
Passed Audits (7)
Avoid landing page redirects
Enable compression
Reduce server response time
Minify CSS
Minify HTML
Minify JavaScript
Prioritize visible content
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