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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

31

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
a.pub.network/sciencenews-org/prebid.js1800.0 s183.8 KiB
a.pub.network/sciencenews-org/pubfig.engine.mobile.js1800.0 s138.5 KiB
c.amazon-adsystem.com/aax2/apstag.js3600.0 s91.0 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s73.1 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s73.1 KiB
s0.2mdn.net/creatives/assets/4703548/AWO_DE_munich_folklore_2024_970x250.jpg900.0 s54.1 KiB
btloader.com/tag?o=5714937848528896&upapi=true300.0 s30.7 KiB
cdn.id5-sync.com/api/1.0/id5-api.js3600.0 s34.5 KiB
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js86400.0 s59.8 KiB
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js86400.0 s59.4 KiB
a.pub.network/sciencenews-org/pubfig.min.js1800.0 s26.3 KiB
s0.2mdn.net/creatives/assets/4703545/970x250_lh_en-sg_brand.js900.0 s21.9 KiB
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js900.0 s21.7 KiB
s0.2mdn.net/creatives/assets/4714589/_LufthansaHeadWeb-Bold.woff2900.0 s21.4 KiB
s0.2mdn.net/creatives/assets/4703548/AWO_Default_A350_2024_970x250.jpg900.0 s19.9 KiB
/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy...1209600.0 s177.5 KiB
s0.2mdn.net/879366/Enabler_01_262.js86400.0 s41.2 KiB
s0.2mdn.net/879366/express_html_inpage_rendering_lib_200_287.js86400.0 s40.5 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s14.4 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s14.0 KiB
config.aps.amazon-adsystem.com/configs/0ab198dd-b265-462a-ae36-74e163ad61593600.0 s6.8 KiB
eus.rubiconproject.com/usync.js56265.0 s11.5 KiB
tags.crwdcntrl.net/lt/c/16576/sync.min.js86400.0 s13.1 KiB
s0.2mdn.net/879366/DcmEnabler_01_262.js86400.0 s11.5 KiB
a.pub.network/core/prebid-universal-creative.js86400.0 s10.1 KiB
/1945776/trc/3/json?tim=1776809981460&data=%7B%22id%22%3A...0.0 ms2.4 KiB
s0.2mdn.net/creatives/assets/4703545/main.js900.0 s1.2 KiB
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite.js1209600.0 s10.5 KiB
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite.js1209600.0 s10.5 KiB
a.pub.network/core/imgs/fslogo-green.svg3600.0 s1.3 KiB
id5-sync.com/c/882/0/8/1.gif?gdpr=0&gdpr_consent=&us_privacy=0.0 ms1.0 KiB
a.pub.network/core/imgs/freestar_close_button.svg3600.0 s1.1 KiB
/pagead/js/r20260420/r20110914/client/qs_click_protection...1209600.0 s8.9 KiB
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js1209600.0 s8.4 KiB
a.pub.network/core/imgs/1.png?x=2026-04-21T22%3A19%3A41.4163600.0 s643 B
/pagead/js/r20260420/r20110914/elements/html/omrhp.js1209600.0 s4.7 KiB
/pagead/js/r20260420/r20110914/elements/html/omrhp.js1209600.0 s4.7 KiB
/pagead/js/r20260420/r20110914/elements/html/omrhp_fy2021.js1209600.0 s3.3 KiB
/px/?rand=1776809980409&plid=54eeafd2-cbe2-4010-85c2-f954...0.0 ms229 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js1209600.0 s1.3 KiB
cdn.indexww.com/ht/htw-pixel.gif?086400.0 s246 B
/hadron.js?url=https%3A%2F%2Fwww.sciencenews.org%2F&ref=&...432000.0 s186 B
cdn.hadronid.net/hadron.js?partner_id=474&_it=prebid432000.0 s90 B
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s0 B
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s0 B
s0.2mdn.net/879366/Enabler_01_262.js86400.0 s0 B
s0.2mdn.net/creatives/assets/4703545/970x250_lh_en-sg_brand.js900.0 s0 B
eus.rubiconproject.com/usync.js56265.0 s0 B
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s0 B
s0.2mdn.net/creatives/assets/4714589/_LufthansaHeadWeb-Bold.woff2900.0 s0 B
/pagead/js/r20260420/r20110914/client/qs_click_protection...1209600.0 s0 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js1209600.0 s0 B
s0.2mdn.net/creatives/assets/4703545/main.js900.0 s0 B
cdn.indexww.com/ht/htw-pixel.gif?086400.0 s0 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
/wp-content/themes/sciencenews/client/src/fonts/wulkan-te...40 ms
/wp-content/themes/sciencenews/client/src/fonts/GT-Americ...25 ms
/wp-content/themes/sciencenews/client/src/fonts/GT-Americ...25 ms
s0.2mdn.net/creatives/assets/4714589/_LufthansaHeadWeb-Bold.woff220 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:0.107 source:map[column:129 line:858 type:source-location url:https://www.googletagmanager.com/gtm.js?id=GTM-KQBZ8HP urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:0.513 source:map[column:374786 line:0 type:source-location url:https://a.pub.network/sciencenews-org/pubfig.engine.mobile.js urlProvider:network]] map[reflowTime:0.107 source:map[column:55 line:902 type:source-location url:https://www.googletagmanager.com/gtag/js?id=G-087KQGPXT5&cx=c&gtm=4e64h1 urlProvider:network]] map[reflowTime:0.444 source:map[type:text value:[unattributed]]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
By Bethany Brookshire3 hours ago div.featured-articles__list___1zYro > article.featured-primary-three-column__wrapper___qlFJC > div.featured-primary-three-column__content___ayIEb > div.featured-primary-three-column__meta___s4d2v
/sadbundle/4456263283913649702/Int_20A_2026Q2_Prospecting...66.7 KiB61.9 KiB
Several sharks swim through shallow, clear water. li.carousel__wrapper___wIECZ > figure.carousel__figure___kTYKK > a.carousel__thumbnail___qpV-2 > img.attachment-thumbnail
/wp-content/uploads/sites/2/2026/03/030926_JPR_cocainesha...55.1 KiB39.5 KiB
Beyond Inheritance offers a new view of mutations article.featured-primary-three-column__wrapper___qlFJC > div.featured-primary-three-column__content___ayIEb > h3.featured-primary-three-column__title___l6a96 > a
/sadbundle/4456263283913649702/Int_20A_2026Q2_Prospecting...40.1 KiB37.5 KiB
Old, plastic fishing nets being collected into a pile on a trailer. li.carousel__wrapper___wIECZ > figure.carousel__figure___kTYKK > a.carousel__thumbnail___qpV-2 > img.attachment-thumbnail
/wp-content/uploads/sites/2/2026/03/033126_SN_pavement_ma...65.0 KiB22.6 KiB
Illustration of a child with a brain full of numbers and surrounded by numbers.… li.carousel__wrapper___wIECZ > figure.carousel__figure___kTYKK > a.carousel__thumbnail___qpV-2 > img.attachment-thumbnail
/wp-content/uploads/sites/2/2026/02/022426_LB_math_main.j...30.8 KiB19.4 KiB
main#content > div.follow-us__wrapper___N8NzF > picture > img.follow-us__background___WNsfy main#content > div.follow-us__wrapper___N8NzF > picture > img.follow-us__background___WNsfy
/wp-content/themes/sciencenews/client/src/images/cta-modu...29.5 KiB14.3 KiB
The Proof in the Code traces efforts to digitally verify mathematical truths div.featured-articles__secondary___9DM9Y > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > h3.featured-secondary__title___mb8GK
s0.2mdn.net/creatives/assets/4703548/AWO_DE_munich_folklore_2024_970x250.jpg54.1 KiB12.7 KiB
The Proof in the Code traces efforts to digitally verify mathematical truths article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > h3.featured-secondary__title___mb8GK > a
/sadbundle/4456263283913649702/Int_20A_2026Q2_Prospecting...12.9 KiB10.3 KiB
MATH The Proof in the Code traces efforts to digitally verify mathematical trut… div.featured-articles__list___1zYro > div.featured-articles__secondary___9DM9Y > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp
/sadbundle/4456263283913649702/Int_20A_2026Q2_Prospecting...9.7 KiB7.1 KiB
div.featured-primary-three-column__content___ayIEb > div.featured-primary-three-column__meta___s4d2v > time.featured-primary-three-column__date___2bHIj > ::before div.featured-primary-three-column__content___ayIEb > div.featured-primary-three-column__meta___s4d2v > time.featured-primary-three-column__date___2bHIj > ::before
/sadbundle/4456263283913649702/Int_20A_2026Q2_Prospecting...8.7 KiB6.1 KiB
MORE STORIES div#page > main#content > section.trending-stories__wrapper___-7tOu > a.trending-stories__archive-link___e25Wo
/sadbundle/4456263283913649702/Int_20A_2026Q2_Prospecting...7.9 KiB5.3 KiB
s0.2mdn.net/creatives/assets/4703548/AWO_Default_A350_2024_970x250.jpg19.9 KiB4.7 KiB

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
/wp-content/themes/sciencenews/client/build/css/home.min....19.4 KiB172 ms

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 959 ms
URLTime Spent
sciencenews.org/959 ms
www.sciencenews.org/0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 651 ms
URLTime Spent
www.sciencenews.org/751 ms

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.1 s 699.2 KiB
URLTransfer SizeEst Savings
/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy...177.5 KiB135.0 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...187.4 KiB91.9 KiB
www.googletagservices.com/tag/js/gpt.js107.6 KiB76.6 KiB
a.pub.network/sciencenews-org/prebid.js183.3 KiB75.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-KQBZ8HP169.5 KiB68.8 KiB
www.googletagmanager.com/gtag/js?id=G-087KQGPXT5&cx=c&gtm=4e64h1173.8 KiB58.8 KiB
www.sciencenews.org/72.0 KiB54.2 KiB
a.pub.network/sciencenews-org/pubfig.engine.mobile.js138.0 KiB50.5 KiB
c.amazon-adsystem.com/aax2/apstag.js90.5 KiB35.5 KiB
/pagead/js/adsbygoogle.js?client=ca-pub-487504955911494254.1 KiB28.6 KiB
/wp-content/themes/sciencenews/client/build/js/home.bundl...45.4 KiB23.6 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
Unattributable6.7 s934 ms0.0 ms
www.sciencenews.org/2.6 s967 ms189 ms
a.pub.network/sciencenews-org/prebid.js1.8 s1.5 s80 ms
c.amazon-adsystem.com/aax2/apstag.js1.5 s1.3 s49 ms
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...1.1 s885 ms79 ms
www.googletagmanager.com/gtm.js?id=GTM-KQBZ8HP1.0 s860 ms81 ms
www.googletagmanager.com/gtag/js?id=G-087KQGPXT5&cx=c&gtm=4e64h1693 ms609 ms75 ms
a.pub.network/sciencenews-org/pubfig.engine.mobile.js590 ms445 ms64 ms
/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy...470 ms358 ms77 ms
btloader.com/tag?o=5714937848528896&upapi=true454 ms408 ms19 ms
cdn.parsely.com/keys/sciencenews.org/p.js?ver=3.23.1383 ms273 ms6.5 ms
cdn.taboola.com/libtrc/unip/1945776/tfa.js253 ms197 ms15 ms
/wp-content/themes/sciencenews/client/build/js/home.bundl...238 ms145 ms22 ms
/pagead/js/adsbygoogle.js?client=ca-pub-4875049559114942184 ms121 ms24 ms
cdn.id5-sync.com/api/1.0/id5-api.js176 ms143 ms16 ms
ep2.adtrafficquality.google/sodar/sodar2.js148 ms132 ms7.8 ms
a.pub.network/sciencenews-org/pubfig.min.js139 ms127 ms11 ms
securepubads.g.doubleclick.net/tag/js/gpt.js136 ms112 ms23 ms
config.aps.amazon-adsystem.com/configs/0ab198dd-b265-462a-ae36-74e163ad6159109 ms73 ms17 ms
tags.crwdcntrl.net/lt/c/16576/sync.min.js108 ms80 ms10 ms
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js76 ms66 ms10 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation9.9 s
Other6.7 s
Script Parsing & Compilation917 ms
Style & Layout638 ms
Garbage Collection334 ms
Parse HTML & CSS249 ms
Rendering245 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not actionable

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 13.3 KiB
URLTransfer SizeEst Savings
/wp-content/themes/sciencenews/client/build/css/home.min....19.1 KiB13.3 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/wp-content/uploads/sites/2/2026/04/040126_NO_ArtemisII_R...12.7 MiB
/wp-content/uploads/sites/2/2026/04/040126_NO_ArtemisII_R...12.1 MiB
www.sciencenews.org/wp-content/uploads/sites/2/2026/04/041526_MJG_BigG_main.mp44.4 MiB
/wp-content/uploads/sites/2/2026/04/040126_NO_ArtemisII_R...828.4 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...187.4 KiB
a.pub.network/sciencenews-org/prebid.js183.8 KiB
/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy...177.5 KiB
www.googletagmanager.com/gtag/js?id=G-087KQGPXT5&cx=c&gtm=4e64h1173.8 KiB
www.sciencenews.org/170.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-KQBZ8HP169.9 KiB

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits
●Optimize DOM size
●LCP breakdown
●LCP request discovery
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 52 user timings
●Avoid long main-thread tasks 20 long tasks found
●Image elements have explicit `width` and `height`
●Network Requests
●Network Round Trip Times 250 ms
●Server Backend Latencies 560 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid large layout shifts 5 layout shifts found
○INP breakdown
○Avoid non-composited animations
90

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
▶ div.featured-media__pull___xKxud > article.featured-media-secondary__wrapper___h9di9 > figure.figure > a.featured-media-secondary__thumbnail___lwApK
▶ div.grouping > article.featured-media-secondary__wrapper___h9di9 > figure.figure > a.featured-media-secondary__thumbnail___lwApK

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
SUBSCRIBE NOW div.site-wrapper > div#page > div.newsletter-global-subscribe__container___fVkwE > a.newsletter-global-subscribe__link___XvwhK
SUBSCRIBE div.magazine-feature__issue-container___hXrMk > div.magazine-highlight__wrapper___18H0P > div.magazine-highlight__list-wrapper___HMj-P > a.magazine-highlight__subscribe___xYsG3

These are opportunities to improve the legibility of your content.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
OCEANS div.featured-articles__secondary___9DM9Y > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > a.featured-secondary__eyebrow___QtjXw
MATH div.featured-articles__secondary___9DM9Y > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > a.featured-secondary__eyebrow___QtjXw
HEALTH & MEDICINE div.featured-articles__ternary___jra8W > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > a.featured-secondary__eyebrow___QtjXw
ANIMALS div.featured-articles__ternary___jra8W > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > a.featured-secondary__eyebrow___QtjXw
HEALTH & MEDICINE div.featured-articles__ternary___jra8W > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > a.featured-secondary__eyebrow___QtjXw
ANIMALS div.featured-articles__ternary___jra8W > article.featured-secondary__wrapper___6uFWZ > div.featured-secondary__content___aGbcp > a.featured-secondary__eyebrow___QtjXw
202.785.2255 footer.site-footer__container___2d5EZ > div.site-footer__legal___kX-Or > address.site-footer__address___4unOl > a.site-footer__phone___J4dMi
Terms of Service div.site-footer__wrapper___-h1gI > footer.site-footer__container___2d5EZ > div.site-footer__legal___kX-Or > a.site-footer__page___4E9r6
Privacy Policy div.site-footer__wrapper___-h1gI > footer.site-footer__container___2d5EZ > div.site-footer__legal___kX-Or > a.site-footer__page___4E9r6

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]`s are contained by their required parent element
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<frame>` or `<iframe>` elements have a title
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
77

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
Topics
a.pub.network/sciencenews-org/prebid.js line 86, col 1157
AttributionReporting
cdn.taboola.com/libtrc/unip/1945776/tfa.js line 2, col 82636

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
www.sciencenews.org/
Access to fetch at 'https://ads.yieldmo.com/exchange/prebid?pbav=11.5.0&p=%5B%7B%22placement_id%22%3A%22sciencenews-org_adhesion%22%2C%22callback_id%22%3A%228e62c572-ad87-476d-9927-30eee9613873%22%2C%22sizes%22%3A%5B%5B320%2C100%5D%2C%5B300%2C100%5D%2C%5B320%2C50%5D%2C%5B300%2C50%5D%2C%5B1%2C1%5D%5D%2C%22ym_placement_id%22%3A%223656750946743951882%22%2C%22gpid%22%3A%22%2F15184186%2Fsciencenews-org_adhesion%22%2C%22tid%22%3A%22ubf525b9a-da2f-487d-9b6f-832fe846a5c9%22%2C%22auctionId%22%3A%22u16d2f0b2-ae2f-4623-950f-feb007720388%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776809982652&dnt=false&description=Science%20News%20features%20news%20articles%2C%20videos%20and%20more%20about%20the%20latest%20scientific%20advances.%20Independent%2C%20accurate%20nonprofit%20news%20since%201921.&tmax=2700&userConsent=%7B%22gdprApplies%22%3A%22%22%2C%22cmp%22%3A%22%22%2C%22gpp%22%3A%22%22%2C%22gpp_sid%22%3A%5B%5D%7D&us_privacy=&pr=&title=Science%20News%20%7C%20The%20latest%20news%20from%20all%20areas%20of%20science&w=412&h=823&mtp=1&schain=%7B%22ver%22%3A%221.0%22%2C%22complete%22%3A1%2C%22nodes%22%3A%5B%7B%22asi%22%3A%22freestar.com%22%2C%22sid%22%3A%221124%22%2C%22hp%22%3A1%7D%5D%7D&eids=%5B%7B%22source%22%3A%22amxdt.net%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22amx*3*d60271b1-d59a-43b7-98a4-03c43a8d1522*84e1f6b7de2e18e914d63c1f336c51dd%22%2C%22atype%22%3A1%7D%5D%7D%2C%7B%22source%22%3A%22pubcid.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22de5b1aac-e2da-4573-acc0-7a399b44ed73%22%2C%22atype%22%3A1%7D%5D%7D%2C%7B%22source%22%3A%22adserver.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22298d1d15-b12b-4eda-baf9-3f0584c2ff0c%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22rtiPartner%22%3A%22TDID%22%7D%7D%5D%2C%22inserter%22%3A%22adserver.org%22%2C%22matcher%22%3A%22adserver.org%22%2C%22mm%22%3A4%7D%5D' from origin 'https://www.sciencenews.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
www.sciencenews.org/
Access to fetch at 'https://ads.yieldmo.com/exchange/prebid?pbav=11.5.0&p=%5B%7B%22placement_id%22%3A%22sciencenews-org_adhesion%22%2C%22callback_id%22%3A%22b05b8540-8551-469c-a919-68eda91df8ff%22%2C%22sizes%22%3A%5B%5B320%2C100%5D%2C%5B300%2C100%5D%2C%5B320%2C50%5D%2C%5B300%2C50%5D%2C%5B1%2C1%5D%5D%2C%22ym_placement_id%22%3A%223656750946743951882%22%2C%22gpid%22%3A%22%2F15184186%2Fsciencenews-org_adhesion%22%2C%22tid%22%3A%22u45e154a0-4e97-4387-9f8b-3693657335e9%22%2C%22auctionId%22%3A%22u5fe0de9d-d1d6-491e-8d5e-65dd9a3651f6%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776810005291&dnt=false&description=Science%20News%20features%20news%20articles%2C%20videos%20and%20more%20about%20the%20latest%20scientific%20advances.%20Independent%2C%20accurate%20nonprofit%20news%20since%201921.&tmax=3000&userConsent=%7B%22gdprApplies%22%3A%22%22%2C%22cmp%22%3A%22%22%2C%22gpp%22%3A%22%22%2C%22gpp_sid%22%3A%5B%5D%7D&us_privacy=&pr=&title=Science%20News%20%7C%20The%20latest%20news%20from%20all%20areas%20of%20science&w=412&h=823&mtp=1&schain=%7B%22ver%22%3A%221.0%22%2C%22complete%22%3A1%2C%22nodes%22%3A%5B%7B%22asi%22%3A%22freestar.com%22%2C%22sid%22%3A%221124%22%2C%22hp%22%3A1%7D%5D%7D&eids=%5B%7B%22source%22%3A%22amxdt.net%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22amx*3*d60271b1-d59a-43b7-98a4-03c43a8d1522*84e1f6b7de2e18e914d63c1f336c51dd%22%2C%22atype%22%3A1%7D%5D%7D%2C%7B%22source%22%3A%22id5-sync.com%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22ID5*Zra0RmhPDXrGgCLBCHRo1IaTYA3CH7gBJfEJhZyVnMD__2nn9_9aAAEBCmnn9_8AojfKqpehgB8deZCOfXSN2A%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22linkType%22%3A1%2C%22pba%22%3A%22Omvv8kNNkYaWGqJ65CKpkB6Muy4Ls3pSbqVrWwXRF5ks9hfCyLVPjbR9m838jefshiz2xHUa6ljyDK4AWgeNfA%3D%3D%22%7D%7D%5D%7D%2C%7B%22source%22%3A%22pubcid.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22de5b1aac-e2da-4573-acc0-7a399b44ed73%22%2C%22atype%22%3A1%7D%5D%7D%2C%7B%22source%22%3A%22adserver.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22298d1d15-b12b-4eda-baf9-3f0584c2ff0c%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22rtiPartner%22%3A%22TDID%22%7D%7D%5D%2C%22inserter%22%3A%22adserver.org%22%2C%22matcher%22%3A%22adserver.org%22%2C%22mm%22%3A4%7D%5D' from origin 'https://www.sciencenews.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
www.sciencenews.org/
Access to fetch at 'https://ads.yieldmo.com/exchange/prebid?pbav=11.5.0&p=%5B%7B%22placement_id%22%3A%22sciencenews-org_adhesion%22%2C%22callback_id%22%3A%22f435454b-3268-4a64-90ee-a7f010772617%22%2C%22sizes%22%3A%5B%5B320%2C100%5D%2C%5B300%2C100%5D%2C%5B320%2C50%5D%2C%5B300%2C50%5D%2C%5B1%2C1%5D%5D%2C%22ym_placement_id%22%3A%223656750946743951882%22%2C%22gpid%22%3A%22%2F15184186%2Fsciencenews-org_adhesion%22%2C%22tid%22%3A%22ue90c0f0c-f13e-44b2-811e-2d90a868cd9f%22%2C%22auctionId%22%3A%22udd1df26c-fc48-421e-9420-e7fb5b38a24f%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776810035167&dnt=false&description=Science%20News%20features%20news%20articles%2C%20videos%20and%20more%20about%20the%20latest%20scientific%20advances.%20Independent%2C%20accurate%20nonprofit%20news%20since%201921.&tmax=3000&userConsent=%7B%22gdprApplies%22%3A%22%22%2C%22cmp%22%3A%22%22%2C%22gpp%22%3A%22%22%2C%22gpp_sid%22%3A%5B%5D%7D&us_privacy=&pr=&title=Science%20News%20%7C%20The%20latest%20news%20from%20all%20areas%20of%20science&w=412&h=823&mtp=1&schain=%7B%22ver%22%3A%221.0%22%2C%22complete%22%3A1%2C%22nodes%22%3A%5B%7B%22asi%22%3A%22freestar.com%22%2C%22sid%22%3A%221124%22%2C%22hp%22%3A1%7D%5D%7D&eids=%5B%7B%22source%22%3A%22amxdt.net%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22amx*3*00b4cee8-155d-4802-8fbd-84dc423f58d2*84e1f6b7de2e18e914d63c1f336c51dd%22%2C%22atype%22%3A1%7D%5D%7D%2C%7B%22source%22%3A%22id5-sync.com%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22ID5*6mB18uSZzM5KVuN1hKKpYApFoblOyXm1qSfIMRBDXXT__2nn-BZaAAEBCmnn9_8AojdibPXFDMT5XjwmRDB3ZQ%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22linkType%22%3A1%2C%22pba%22%3A%22mUYzDihqCqFh5IuinuRoiJMtXIK39EGww1TQF7TkV%2FYTjKAU5PAgKOnfsyfQjmz8c4CCpIh%2B2Hzf8nYZnH6lfw%3D%3D%22%7D%7D%5D%7D%2C%7B%22source%22%3A%22pubcid.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22de5b1aac-e2da-4573-acc0-7a399b44ed73%22%2C%22atype%22%3A1%7D%5D%7D%2C%7B%22source%22%3A%22adserver.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%22298d1d15-b12b-4eda-baf9-3f0584c2ff0c%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22rtiPartner%22%3A%22TDID%22%7D%7D%5D%2C%22inserter%22%3A%22adserver.org%22%2C%22matcher%22%3A%22adserver.org%22%2C%22mm%22%3A4%7D%5D' from origin 'https://www.sciencenews.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
www.sciencenews.org/
Access to fetch at 'https://api.rlcdn.com/api/identity/envelope?pid=106' from origin 'https://www.sciencenews.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
api.rlcdn.com/api/identity/envelope?pid=106
Failed to load resource: net::ERR_FAILED
/exchange/prebid?pbav=11.5.0&p=%5B%7B%22placement_id%22%3...
Failed to load resource: net::ERR_FAILED
/exchange/prebid?pbav=11.5.0&p=%5B%7B%22placement_id%22%3...
Failed to load resource: net::ERR_FAILED
/exchange/prebid?pbav=11.5.0&p=%5B%7B%22placement_id%22%3...
Failed to load resource: net::ERR_FAILED
www.sciencenews.org/blaize/account
Failed to load resource: the server responded with a status of 401 ()
●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
Freestar div#fs-sticky-footer > div#fs-slot-footer-wrapper > div.__fs-branding > a

To appear in search results, crawlers need access to your app.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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