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

Audit breakdown by category with detailed findings.

45

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.

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.003267] map[node:map[boundingRect:map[bottom:386 height:35 left:620 right:1119 top:351 width:498] lhId:page-2-UL nodeLabel:MAGAZINE MENU ABOUT SN EXPLORES OUR STORE path:1,HTML,1,BODY,1,DIV,3,DIV,5,HEADER,0,DIV,0,NAV,1,DIV,1,UL selector:div.site-header__inner___lI5fO > nav.nav-bar__wrapper___0b-CD > div.nav-bar__nav-bar___PdKD4 > ul#primary-menu snippet:<ul id="primary-menu" class="primary-menu__menu___YlL1y"> type:node] score:0.002776] map[node:map[boundingRect:map[bottom:386 height:35 left:620 right:1119 top:351 width:498] lhId:page-2-UL nodeLabel:MAGAZINE MENU ABOUT SN EXPLORES OUR STORE path:1,HTML,1,BODY,1,DIV,3,DIV,5,HEADER,0,DIV,0,NAV,1,DIV,1,UL selector:div.site-header__inner___lI5fO > nav.nav-bar__wrapper___0b-CD > div.nav-bar__nav-bar___PdKD4 > ul#primary-menu snippet:<ul id="primary-menu" class="primary-menu__menu___YlL1y"> type:node] score:0.000491]]
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.095888] map[node:map[boundingRect:map[bottom:287 height:272 left:190 right:1160 top:15 width:970] lhId:page-9-DIV nodeLabel:Advertisement path:1,HTML,1,BODY,1,DIV,3,DIV,1,SECTION,0,DIV selector:div.site-wrapper > div#page > section.ad-block__mq-wrapper > div.content snippet:<div class="content"> type:node] score:0.094114] map[node:map[boundingRect:map[bottom:5626 height:5102 left:0 right:1350 top:524 width:1350] lhId:page-6-MAIN nodeLabel:Science News INDEPENDENT JOURNALISM SINCE 1921 Featured Stories HEALTH & MEDICI… path:1,HTML,1,BODY,1,DIV,3,DIV,6,MAIN selector:body.home > div.site-wrapper > div#page > main#content snippet:<main id="content" class="site-main"> type:node] score:0.001774]]
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.23742400000000002] map[node:map[boundingRect:map[bottom:5626 height:5102 left:0 right:1350 top:524 width:1350] lhId:page-6-MAIN nodeLabel:Science News INDEPENDENT JOURNALISM SINCE 1921 Featured Stories HEALTH & MEDICI… path:1,HTML,1,BODY,1,DIV,3,DIV,6,MAIN selector:body.home > div.site-wrapper > div#page > main#content snippet:<main id="content" class="site-main"> type:node] score:0.13465] map[node:map[boundingRect:map[bottom:287 height:272 left:190 right:1160 top:15 width:970] lhId:page-9-DIV nodeLabel:Advertisement path:1,HTML,1,BODY,1,DIV,3,DIV,1,SECTION,0,DIV selector:div.site-wrapper > div#page > section.ad-block__mq-wrapper > div.content snippet:<div class="content"> type:node] score:0.074617] map[node:map[boundingRect:map[bottom:940 height:21 left:0 right:1350 top:919 width:1350] lhId:page-13-DIV nodeLabel:Advertisement path:1,HTML,1,BODY,29,DIV selector:body.home > div#fs-sticky-footer snippet:<div class="fs-sticky-footer" id="fs-sticky-footer" style="min-height: 21px; background-color: rgba(255, 255, 255, 0);"> type:node] score:0.025816] map[node:map[boundingRect:map[bottom:5626 height:5102 left:0 right:1350 top:524 width:1350] lhId:page-6-MAIN nodeLabel:Science News INDEPENDENT JOURNALISM SINCE 1921 Featured Stories HEALTH & MEDICI… path:1,HTML,1,BODY,1,DIV,3,DIV,6,MAIN selector:body.home > div.site-wrapper > div#page > main#content snippet:<main id="content" class="site-main"> type:node] score:0.001774] map[score:0.000567]]

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...20 ms
s0.2mdn.net/creatives/assets/4714589/_LufthansaHeadWeb-Bold.woff210 ms
s0.2mdn.net/creatives/assets/4714589/_LufthansaHeadWeb-Bold.woff210 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:0.125 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:0.125 source:map[column:376 line:867 type:source-location url:https://www.googletagmanager.com/gtag/js?id=G-087KQGPXT5&cx=c&gtm=4e64h1 urlProvider:network]] map[reflowTime:0.237 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
value: No additional origins are good candidates for preconnecting

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 s183.9 KiB
a.pub.network/sciencenews-org/pubfig.engine.js1800.0 s138.4 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.js?...3600.0 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 s30.6 KiB
s0.2mdn.net/creatives/assets/4703548/AWO_FI_helsinki_cathedral_2024_970x250.jpg900.0 s32.3 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 s59.5 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
/pagead/managed/js/adsense/m202604160101/show_ads_impl_fy...1209600.0 s177.5 KiB
s0.2mdn.net/879366/Enabler_01_262.js86400.0 s41.3 KiB
s0.2mdn.net/879366/express_html_inpage_rendering_lib_200_287.js86400.0 s40.9 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s14.4 KiB
www.googletagservices.com/dcm/dcmads.js3600.0 s7.3 KiB
config.aps.amazon-adsystem.com/configs/0ab198dd-b265-462a-ae36-74e163ad61593600.0 s6.8 KiB
eus.rubiconproject.com/usync.js56182.0 s11.5 KiB
tags.crwdcntrl.net/lt/c/16576/sync.min.js86400.0 s13.1 KiB
a.pub.network/core/prebid-universal-creative.js86400.0 s10.1 KiB
/feed/placement.js?id=fR7PdDEk8FXlPfMgXhQm&preview=0&tm_a...0.0 ms3.8 KiB
a.pub.network/core/puc/banner.js3600.0 s3.8 KiB
/ud/prod/ad_plugins/release/displayproxy-20231031.js?auct...86400.0 s6.3 KiB
/1945776/trc/3/json?tim=1776810064258&data=%7B%22id%22%3A...0.0 ms2.4 KiB
playtime.tubemogul.com/ud/prod/pullins/aac_viewability-ab8b7a.js86400.0 s5.1 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
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
tpc.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js1209600.0 s8.7 KiB
a.pub.network/core/imgs/1.png?x=2026-04-21T22%3A21%3A04.5843600.0 s643 B
/pagead/js/r20260420/r20110914/elements/html/omrhp.js1209600.0 s4.7 KiB
a.pub.network/core/puc/banner.js3600.0 s539 B
/px/?rand=1776810063056&plid=5925577a-af30-4509-8048-f37a...0.0 ms229 B
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
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s0 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
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s0 B
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js86400.0 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.js56182.0 s0 B
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s0 B
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s0 B
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s0 B
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite.js1209600.0 s0 B
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite.js1209600.0 s0 B
s0.2mdn.net/creatives/assets/4714589/_LufthansaHeadWeb-Bold.woff2900.0 s0 B
tpc.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js1209600.0 s0 B
tpc.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js1209600.0 s0 B
/pagead/js/r20260420/r20110914/elements/html/omrhp.js1209600.0 s0 B
/pagead/js/r20260420/r20110914/elements/html/omrhp.js1209600.0 s0 B
/pagead/js/r20260420/r20110914/elements/html/omrhp.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

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
Got pesky, invasive corals? Blast ‘em away with air guns 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 KiB40.6 KiB
ABOUT nav.nav-bar__wrapper___0b-CD > div.nav-bar__nav-bar___PdKD4 > ul#primary-menu > li#menu-item-951026
s0.2mdn.net/creatives/assets/4703548/AWO_FI_helsinki_cathedral_2024_970x250.jpg32.3 KiB24.2 KiB
May 2026 cover of Science News div.magazine-highlight__wrapper___18H0P > figure.magazine-highlight__figure___70-x6 > a.magazine-highlight__thumbnail___SCOib > img.attachment-issue
/wp-content/uploads/sites/2/2026/04/0526_cover_1000.jpg?r...27.9 KiB18.2 KiB
Why is math harder for some kids? Brain scans offer clues ol#swiper-wrapper-f42c4675a0df9b7b > li.carousel__wrapper___wIECZ > div.carousel__content___Lm9o8 > h3.carousel__title___1uDeB
/sadbundle/9715427952723875796/images/de6a66182cc6796e5c1...19.3 KiB8.6 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...35.9 KiB8.5 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...17.6 KiB7.6 KiB
s0.2mdn.net/simgad/74742163620577532318.0 KiB7.4 KiB
Numerous jars of preserved animals sit on a shelf. li.term-river-grid__wrapper___ceqo9 > figure.term-river-grid__figure___jC5X1 > a.term-river-grid__thumbnail___CSJfq > img.attachment-thumbnail
/wp-content/uploads/sites/2/2026/04/0526_Smithsonian_feat...15.4 KiB5.4 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...15.1 KiB5.2 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 KiB109 ms

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

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: 498 ms
URLTime Spent
sciencenews.org/498 ms
www.sciencenews.org/0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Science News INDEPENDENT JOURNALISM SINCE 1921 Featured Stories HEALTH & MEDICI… body.home > div.site-wrapper > div#page > main#content
0.135
Advertisement div.site-wrapper > div#page > section.ad-block__mq-wrapper > div.content
0.094
Advertisement div.site-wrapper > div#page > section.ad-block__mq-wrapper > div.content
0.075
Advertisement body.home > div#fs-sticky-footer
0.026
MAGAZINE MENU ABOUT SN EXPLORES OUR STORE div.site-header__inner___lI5fO > nav.nav-bar__wrapper___0b-CD > div.nav-bar__nav-bar___PdKD4 > ul#primary-menu
0.003
Science News INDEPENDENT JOURNALISM SINCE 1921 Featured Stories HEALTH & MEDICI… body.home > div.site-wrapper > div#page > main#content
0.002
Science News INDEPENDENT JOURNALISM SINCE 1921 Featured Stories HEALTH & MEDICI… body.home > div.site-wrapper > div#page > main#content
0.002
0.001
MAGAZINE MENU ABOUT SN EXPLORES OUR STORE div.site-header__inner___lI5fO > nav.nav-bar__wrapper___0b-CD > div.nav-bar__nav-bar___PdKD4 > ul#primary-menu
0.000

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.

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: 50 ms 981.9 KiB
URLTransfer SizeEst Savings
/pagead/managed/js/adsense/m202604160101/show_ads_impl_fy...177.5 KiB134.0 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js187.7 KiB94.9 KiB
www.googletagservices.com/tag/js/gpt.js107.6 KiB76.6 KiB
a.pub.network/sciencenews-org/prebid.js183.3 KiB73.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-KQBZ8HP169.5 KiB68.2 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.js137.9 KiB48.4 KiB
c.amazon-adsystem.com/aax2/apstag.js90.5 KiB31.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js?...73.1 KiB31.1 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.9 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.7 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.3 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.3 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.0 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.0 KiB
/pagead/js/adsbygoogle.js?client=ca-pub-487504955911494254.2 KiB28.7 KiB
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js59.4 KiB23.3 KiB
/wp-content/themes/sciencenews/client/build/js/home.bundl...45.4 KiB23.0 KiB
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js59.4 KiB22.9 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
Unattributable2.5 s339 ms0.0 ms
www.sciencenews.org/616 ms189 ms50 ms
/pagead/managed/js/activeview/current/ufs_web_display.js575 ms469 ms84 ms
a.pub.network/sciencenews-org/prebid.js523 ms438 ms19 ms
pagead2.googlesyndication.com/pagead/js/dv3.js491 ms409 ms21 ms
www.googletagmanager.com/gtm.js?id=GTM-KQBZ8HP405 ms365 ms19 ms
/pagead/managed/js/gpt/m202604160201/pubads_impl.js374 ms298 ms37 ms
s0.2mdn.net/879366/express_html_inpage_rendering_lib_200_287.js326 ms284 ms4.0 ms
a.pub.network/sciencenews-org/pubfig.engine.js256 ms183 ms16 ms
c.amazon-adsystem.com/aax2/apstag.js200 ms174 ms12 ms
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js168 ms128 ms23 ms
www.googletagmanager.com/gtag/js?id=G-087KQGPXT5&cx=c&gtm=4e64h1168 ms148 ms18 ms
/pagead/managed/js/adsense/m202604160101/show_ads_impl_fy...164 ms123 ms23 ms
/pagead/managed/js/activeview/current/ufs_web_display.js?...114 ms101 ms10 ms
/wp-content/themes/sciencenews/client/build/js/home.bundl...81 ms43 ms5.8 ms
cdn.parsely.com/keys/sciencenews.org/p.js?ver=3.23.180 ms61 ms1.6 ms
/pagead/js/adsbygoogle.js?client=ca-pub-487504955911494267 ms40 ms5.6 ms
ep2.adtrafficquality.google/sodar/VFc2VJAc.js65 ms49 ms8.3 ms
cdn.taboola.com/libtrc/unip/1945776/tfa.js63 ms51 ms3.2 ms
adsdkprod.azureedge.net/viewability/versions/v5.8.27/banner.js55 ms44 ms8.6 ms
btloader.com/tag?o=5714937848528896&upapi=true55 ms49 ms3.0 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 Evaluation4.3 s
Other2.4 s
Script Parsing & Compilation455 ms
Garbage Collection211 ms
Style & Layout201 ms
Rendering127 ms
Parse HTML & CSS116 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 10.5 KiB
URLTransfer SizeEst Savings
/wp-content/themes/sciencenews/client/build/css/home.min....19.1 KiB10.5 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...11.5 MiB
www.sciencenews.org/wp-content/uploads/sites/2/2026/04/041526_MJG_BigG_main.mp44.6 MiB
/wp-content/uploads/sites/2/2026/04/040126_NO_ArtemisII_R...1.6 MiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js187.7 KiB
a.pub.network/sciencenews-org/prebid.js183.9 KiB
/pagead/managed/js/adsense/m202604160101/show_ads_impl_fy...177.5 KiB
www.googletagmanager.com/gtag/js?id=G-087KQGPXT5&cx=c&gtm=4e64h1173.9 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.

●Optimize DOM size
●LCP breakdown
●LCP request discovery
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 61 user timings
●Avoid long main-thread tasks 20 long tasks found
●Image elements have explicit `width` and `height`
●Network Requests
●Network Round Trip Times 260 ms
●Server Backend Latencies 500 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 450 ms
○INP breakdown
○Avoid non-composited animations
93

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
DONATE nav.nav-bar__wrapper___0b-CD > div.nav-bar__nav-bar___PdKD4 > div.nav-bar__actions___afEUJ > a.nav-bar-donate-link
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.

○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
●Touch targets have sufficient size and spacing.
●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
SharedStorage
/pagead/managed/js/activeview/current/ufs_web_display.js line 252, col 234
Unload event listeners are deprecated and will be removed.
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js line 76, col 27
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%2254ea4cc3-608b-4e06-8e5d-952c2e52d394%22%2C%22sizes%22%3A%5B%5B970%2C90%5D%2C%5B728%2C90%5D%2C%5B468%2C60%5D%2C%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%22u9affc1fc-47a1-4262-992b-1632de651787%22%2C%22auctionId%22%3A%22uc174dee3-a0f3-4319-bb4c-222f3df6d118%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776810088210&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=1350&h=940&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*8f9df1d0-e62a-40d7-8fdd-5cd2a5d6bda1*721ddcde3086312e1b9c6a49c7c9f98a%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*BxCLEcw0eh9ythAjcIdEU0a8BIgVJT19r0UxllHsaOz__2nn-FJaAAEBCmnn-FIAojc12HJV9x6ND3Io6EPMPA%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22linkType%22%3A1%2C%22pba%22%3A%22gact8U1HW4be3exviJKRk8YZgyEeLrEH%2FN2NRwOhK2J4oBG9hABXG1%2BjT0ntWyPVORlFHtVBn53FZarAwDQj2w%3D%3D%22%7D%7D%5D%7D%2C%7B%22source%22%3A%22pubcid.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%229fe90b12-431e-406c-b8b7-952c9dd67d2d%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%2213ee4c51-45e7-4970-bfbe-f4df06f3324c%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%22cda58ba7-57a3-4e6c-aeb0-e99a7a55be9e%22%2C%22sizes%22%3A%5B%5B970%2C90%5D%2C%5B728%2C90%5D%2C%5B468%2C60%5D%2C%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%22u275f8089-bf53-4c10-a7c5-a07d86b724cf%22%2C%22auctionId%22%3A%22u459ffeec-6fd7-49dd-85a8-cec4e7260e40%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776810118205&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=1350&h=940&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*eb3e2980-e572-4f74-afdc-e4640435181f*721ddcde3086312e1b9c6a49c7c9f98a%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*yMWYfgPhaXC9YwNMv1JXPIlpF-fa8C4SYJAi-Z45e4P__2nn-GlaAAEBCmnn-FIAojfD5XD5euJf9EPFJVR0YQ%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22linkType%22%3A1%2C%22pba%22%3A%22aqqNM%2BRM1nkeE%2FLrPENF5zxEC8XfB7rp8uGPHererwQUqniiJ8xh%2FuM2AF9emy1q%2FVEPS5N%2FcFlLSAX6UU4Tzw%3D%3D%22%7D%7D%5D%7D%2C%7B%22source%22%3A%22pubcid.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%229fe90b12-431e-406c-b8b7-952c9dd67d2d%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%2213ee4c51-45e7-4970-bfbe-f4df06f3324c%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_leaderboard_atf%22%2C%22callback_id%22%3A%2208426e83-5973-4333-969e-15afe7cbd7ce%22%2C%22sizes%22%3A%5B%5B970%2C250%5D%5D%2C%22ym_placement_id%22%3A%222662464007037722661%22%2C%22gpid%22%3A%22%2F15184186%2Fsciencenews-org_leaderboard_atf%22%2C%22tid%22%3A%22uc48ba02f-7d08-406e-b9aa-2b14a1ca29d7%22%2C%22auctionId%22%3A%22u0384dad4-e448-452e-baf9-fd71158886dc%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776810118137&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=1350&h=940&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*eb3e2980-e572-4f74-afdc-e4640435181f*721ddcde3086312e1b9c6a49c7c9f98a%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*yMWYfgPhaXC9YwNMv1JXPIlpF-fa8C4SYJAi-Z45e4P__2nn-GlaAAEBCmnn-FIAojfD5XD5euJf9EPFJVR0YQ%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22linkType%22%3A1%2C%22pba%22%3A%22aqqNM%2BRM1nkeE%2FLrPENF5zxEC8XfB7rp8uGPHererwQUqniiJ8xh%2FuM2AF9emy1q%2FVEPS5N%2FcFlLSAX6UU4Tzw%3D%3D%22%7D%7D%5D%7D%2C%7B%22source%22%3A%22pubcid.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%229fe90b12-431e-406c-b8b7-952c9dd67d2d%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%2213ee4c51-45e7-4970-bfbe-f4df06f3324c%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_leaderboard_atf%22%2C%22callback_id%22%3A%22230fbf23-7545-409d-9efe-69747da2ef46%22%2C%22sizes%22%3A%5B%5B970%2C250%5D%5D%2C%22ym_placement_id%22%3A%222662464007037722661%22%2C%22gpid%22%3A%22%2F15184186%2Fsciencenews-org_leaderboard_atf%22%2C%22tid%22%3A%22u1e659db4-c50b-46a4-8f1c-31f53ef78945%22%2C%22auctionId%22%3A%22uf122c979-b3dd-4218-8a7e-e380c86c30d4%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776810088108&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=1350&h=940&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*8f9df1d0-e62a-40d7-8fdd-5cd2a5d6bda1*721ddcde3086312e1b9c6a49c7c9f98a%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*BxCLEcw0eh9ythAjcIdEU0a8BIgVJT19r0UxllHsaOz__2nn-FJaAAEBCmnn-FIAojc12HJV9x6ND3Io6EPMPA%22%2C%22atype%22%3A1%2C%22ext%22%3A%7B%22linkType%22%3A1%2C%22pba%22%3A%22gact8U1HW4be3exviJKRk8YZgyEeLrEH%2FN2NRwOhK2J4oBG9hABXG1%2BjT0ntWyPVORlFHtVBn53FZarAwDQj2w%3D%3D%22%7D%7D%5D%7D%2C%7B%22source%22%3A%22pubcid.org%22%2C%22uids%22%3A%5B%7B%22id%22%3A%229fe90b12-431e-406c-b8b7-952c9dd67d2d%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%2213ee4c51-45e7-4970-bfbe-f4df06f3324c%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_leaderboard_atf%22%2C%22callback_id%22%3A%2265e6bc39-d752-4d38-8890-a90bf95d526d%22%2C%22sizes%22%3A%5B%5B970%2C250%5D%5D%2C%22ym_placement_id%22%3A%222662464007037722661%22%2C%22gpid%22%3A%22%2F15184186%2Fsciencenews-org_leaderboard_atf%22%2C%22tid%22%3A%22ua96b51f3-b61c-487e-86ad-dfeb4983c56a%22%2C%22auctionId%22%3A%22u0bcab2d0-d0ce-49ae-a2ee-49486aaf4a47%22%7D%2C%7B%22placement_id%22%3A%22sciencenews-org_adhesion%22%2C%22callback_id%22%3A%22d27e4a85-b43c-4d8a-ba58-82132f2ebd4a%22%2C%22sizes%22%3A%5B%5B970%2C90%5D%2C%5B728%2C90%5D%2C%5B468%2C60%5D%2C%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%22ua77ffef1-5661-4555-8b90-d5658bbbe6be%22%2C%22auctionId%22%3A%22u0bcab2d0-d0ce-49ae-a2ee-49486aaf4a47%22%7D%5D&page_url=https%3A%2F%2Fwww.sciencenews.org%2F&bust=1776810065488&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=2800&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=1350&h=940&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*8f9df1d0-e62a-40d7-8fdd-5cd2a5d6bda1*721ddcde3086312e1b9c6a49c7c9f98a%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%229fe90b12-431e-406c-b8b7-952c9dd67d2d%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%2213ee4c51-45e7-4970-bfbe-f4df06f3324c%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
/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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