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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.

14

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
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer.js0.0 ms5.2 MiB
www.eurekalert.org/build/app.73156b0e.js0.0 ms413.8 KiB
www.eurekalert.org/build/app.5767a7ce.css0.0 ms203.0 KiB
www.eurekalert.org/build/0.2d5a26c8.js0.0 ms146.0 KiB
www.eurekalert.org/build/1.fe6350c6.js0.0 ms91.8 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer-ui.css0.0 ms82.7 KiB
assets.adobedtm.com/a48c09ba9d50/1e36ca10b673/launch-ea90f2ac46ad.min.js3600.0 s98.1 KiB
www.eurekalert.org/images/uploads/square-logo-webp-61e9ce6638ed0279651159.webp0.0 ms70.5 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s73.1 KiB
/images/uploads/spj24-eurekalert-banner300x250-1-6810f105...0.0 ms49.9 KiB
/images/uploads/acs-18148-2026-spring-meeting-eureka-aler...0.0 ms40.3 KiB
www.eurekalert.org/images/uploads/300x250-66ec251bf0e1e972115578.webp0.0 ms37.6 KiB
/signals/config/2654080238088440?v=2.9.303&r=stable&domai...1200.0 s33.2 KiB
www.eurekalert.org/build/fonts/glyphicons-halflings-regular.e3cab037.woff0.0 ms23.1 KiB
www.eurekalert.org/images/uploads/climate_change_square_202412.webp0.0 ms14.3 KiB
www.eurekalert.org/images/uploads/marine_science_square_202412.webp0.0 ms14.2 KiB
/images/uploads/acs-chemistry-for-life-2color-rbg-logo-65...0.0 ms13.6 KiB
www.eurekalert.org/images/uploads/wpi-stacked-6597042621f41381516210.webp0.0 ms11.8 KiB
www.eurekalert.org/images/uploads/cancer_research_square_202412.webp0.0 ms11.6 KiB
www.eurekalert.org/images/logo-2x.png0.0 ms11.1 KiB
/images/uploads/features-and-articles-portal-6555178dbd3a...0.0 ms10.4 KiB
/images/uploads/parkinson-s-awareness-1-69cd11e5ad50d4264...0.0 ms7.9 KiB
www.eurekalert.org/images/bg.header-mobile.webp0.0 ms7.3 KiB
/images/uploads/nutrition-logo-square-69c2e13756cfb058065...0.0 ms7.3 KiB
www.eurekalert.org/images/brand.png0.0 ms7.3 KiB
www.eurekalert.org/images/uploads/nsf-homepage-6167beda9b896028132993.webp0.0 ms5.8 KiB
www.eurekalert.org/images/uploads/doe-616706ce1dcf5908761926.webp0.0 ms4.4 KiB
/images/uploads/nih-master-logo-mark-2color-61659fb9b6ba7...0.0 ms3.1 KiB
www.eurekalert.org/images/logo-footer.png0.0 ms3.0 KiB
www.eurekalert.org/build/runtime.7576e7bf.js0.0 ms1.7 KiB
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js1209600.0 s8.4 KiB
/a48c09ba9d50/1e36ca10b673/3fdd7eac0600/RC7cda37fed2cb4b9...3600.0 s864 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js1209600.0 s1.2 KiB
/tr/?id=2654080238088440&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms19 B
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s0 B
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js1209600.0 s0 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js1209600.0 s0 B

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:0.23291] map[node:map[boundingRect:map[bottom:757 height:81 left:5 right:407 top:676 width:402] lhId:page-14-HEADER nodeLabel:Mars rover detects never-before-seen organic compounds in new experiment UNIVE… path:5,HTML,2,BODY,0,DIV,1,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,ARTICLE,0,A,1,HEADER selector:div.col-sm-7 > article.trending > a > header snippet:<header> type:node] score:0.232373 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1692 height:142 left:19 right:189 top:1550 width:170] lhId:page-5-IMG nodeLabel:a > div.microsite-card__inner > div.microsite-card__image > img path:5,HTML,2,BODY,0,DIV,1,DIV,0,DIV,0,DIV,3,DIV,0,DIV,0,A,0,DIV,0,DIV,0,IMG selector:a > div.microsite-card__inner > div.microsite-card__image > img snippet:<img src="/images/uploads/acs-18148-2026-spring-meeting-eureka-alert-newsroom-graphi…"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:161 height:46 left:297 right:412 top:116 width:115] lhId:page-10-UL nodeLabel:LOGIN REGISTER path:5,HTML,2,BODY,0,DIV,0,HEADER,1,DIV,0,DIV,1,UL selector:header#navigation > div.navbar > div.container > ul.account snippet:<ul class="account nav nav-pills pull-right"> type:node] score:0.000516 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:5062 height:49 left:146 right:238 top:5013 width:92] lhId:page-19-IMG nodeLabel:AAAS - American Association for the Advancement of Science path:5,HTML,2,BODY,1,FOOTER,0,DIV,0,DIV,0,DIV,1,P,0,IMG selector:div.row > div.col-sm-5 > p.brand > img snippet:<img src="/images/brand.png" alt="AAAS - American Association for the Advancement of Science"> type:node]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:78 height:41 left:364 right:402 top:38 width:38] lhId:page-13-BUTTON nodeLabel:div.container > div.clearfix > div.search-wrapper > button.search-btn path:5,HTML,2,BODY,0,DIV,0,HEADER,0,DIV,0,DIV,1,DIV,2,DIV,0,BUTTON selector:div.container > div.clearfix > div.search-wrapper > button.search-btn snippet:<button type="button" data-toggle="collapse" data-target="#search" class="search-btn"> type:node] score:2.1e-05 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:5062 height:49 left:146 right:238 top:5013 width:92] lhId:page-19-IMG nodeLabel:AAAS - American Association for the Advancement of Science path:5,HTML,2,BODY,1,FOOTER,0,DIV,0,DIV,0,DIV,1,P,0,IMG selector:div.row > div.col-sm-5 > p.brand > img snippet:<img src="/images/brand.png" alt="AAAS - American Association for the Advancement of Science"> type:node]] map[cause:Web font extra:map[type:url value:https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0]]] type:subitems]]]

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
www.eurekalert.org/build/fonts/glyphicons-halflings-regular.e3cab037.woff260 ms
/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.070 ms
/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu...35 ms

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
body.jar > div#google_image_div > a#aw0 > img.img_ad body.jar > div#google_image_div > a#aw0 > img.img_ad
tpc.googlesyndication.com/simgad/11145741928525800709139.9 KiB127.6 KiB
IMAGE article.trending > a > div.thumb > img
/Api/v1/Multimedia/a32454cd-fe90-4d40-b851-03b8f55a9083/R...105.5 KiB103.7 KiB
body.jar > div#google_image_div > a#aw0 > img.img_ad body.jar > div#google_image_div > a#aw0 > img.img_ad
tpc.googlesyndication.com/simgad/1598895476931463042989.6 KiB77.3 KiB
IMAGE article.trending > a > div.thumb > img
/Api/v1/Multimedia/eb21929e-e749-4f51-8eab-3e05ae971012/R...63.3 KiB61.6 KiB
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/square-logo-webp-61e9ce6638ed0279651159.webp70.1 KiB58.4 KiB
IMAGE article.trending > a > div.thumb > img
/Api/v1/Multimedia/8b6edfc0-af40-4846-8ad4-565cde214be5/R...43.9 KiB42.3 KiB
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
/images/uploads/spj24-eurekalert-banner300x250-1-6810f105...49.6 KiB37.6 KiB
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
/images/uploads/acs-18148-2026-spring-meeting-eureka-aler...40.0 KiB28.0 KiB
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/300x250-66ec251bf0e1e972115578.webp37.3 KiB25.3 KiB
EurekAlert! Science News div.clearfix > div.col-md-6 > a.logo > img
www.eurekalert.org/images/logo-2x.png10.8 KiB6.1 KiB
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/wpi-stacked-6597042621f41381516210.webp11.5 KiB6.0 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:1244.6490009765625 label:Time to first byte subpart:timeToFirstByte] map[duration:342.2529990234375 label:Resource load delay subpart:resourceLoadDelay] map[duration:2064.295 label:Resource load duration subpart:resourceLoadDuration] map[duration:143.437 label:Element render delay subpart:elementRenderDelay]]
lhId: page-9-IMG
nodeLabel: IMAGE
path: 5,HTML,2,BODY,0,DIV,1,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,ARTICLE,0,A,0,IMG
selector: div.col-sm-7 > article.trending > a > img
snippet: <img src="https://mediasvc.eurekalert.org/Api/v1/Multimedia/0febe447-a559-473e-83bf-…" alt="IMAGE">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-9-IMG
nodeLabel: IMAGE
path: 5,HTML,2,BODY,0,DIV,1,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,ARTICLE,0,A,0,IMG
selector: div.col-sm-7 > article.trending > a > img
snippet: <img src="https://mediasvc.eurekalert.org/Api/v1/Multimedia/0febe447-a559-473e-83bf-…" alt="IMAGE">

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
value: no origins were preconnected
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

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
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer.js5.2 MiB26.1 s
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer-ui.css82.7 KiB615 ms
www.eurekalert.org/build/app.5767a7ce.css203.0 KiB1.8 s
maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css7.4 KiB912 ms
ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.css8.5 KiB816 ms
/css?family=Open+Sans:300italic,400italic,600italic,700it...2.8 KiB819 ms

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
/Api/v1/Multimedia/135edc95-2c3a-47ab-9b16-f1cb36df8de6/R...http/1.1
/Api/v1/Multimedia/46657ab8-4a30-43ad-812e-4537e0018693/R...http/1.1
/Api/v1/Multimedia/0febe447-a559-473e-83bf-ba6e356d7df5/R...http/1.1
/Api/v1/Multimedia/eb21929e-e749-4f51-8eab-3e05ae971012/R...http/1.1
/Api/v1/Multimedia/8b6edfc0-af40-4846-8ad4-565cde214be5/R...http/1.1
/Api/v1/Multimedia/a32454cd-fe90-4d40-b851-03b8f55a9083/R...http/1.1

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: 1.2 s
URLTime Spent
eurekalert.org/1.2 s
www.eurekalert.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
Mars rover detects never-before-seen organic compounds in new experiment UNIVE… div.col-sm-7 > article.trending > a > header
0.232
LOGIN REGISTER header#navigation > div.navbar > div.container > ul.account
0.001
div.container > div.clearfix > div.search-wrapper > button.search-btn div.container > div.clearfix > div.search-wrapper > button.search-btn
0.000

Diagnostics

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: 1.7 s 271.5 KiB
URLTransfer SizeEst Savings
www.eurekalert.org/build/app.5767a7ce.css202.5 KiB189.1 KiB
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer-ui.css82.4 KiB82.4 KiB

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: 20.8 s 4.7 MiB
URLTransfer SizeEst Savings
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer.js5.2 MiB3.7 MiB
www.eurekalert.org/build/app.73156b0e.js412.3 KiB358.7 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...187.4 KiB104.6 KiB
www.googletagmanager.com/gtag/js?id=G-KQG7WRFJWG&cx=c&gtm=4e64h1172.0 KiB68.2 KiB
www.eurekalert.org/build/0.2d5a26c8.js145.5 KiB67.8 KiB
www.eurekalert.org/build/1.fe6350c6.js91.4 KiB62.5 KiB
www.googletagmanager.com/gtag/js?id=AW-823154227&cx=c&gtm=4e64h1144.6 KiB62.4 KiB
www.googletagmanager.com/gtag/js?id=AW-975347983&cx=c&gtm=4e64h1137.7 KiB61.4 KiB
www.googletagmanager.com/gtag/js?id=AW-1070246774&l=dataLayer137.6 KiB57.0 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB34.7 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB31.8 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB31.8 KiB
assets.adobedtm.com/a48c09ba9d50/1e36ca10b673/launch-ea90f2ac46ad.min.js97.8 KiB30.3 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
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer.js2.2 s1.8 s439 ms
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...1.3 s1.2 s82 ms
www.eurekalert.org/1.2 s688 ms24 ms
Unattributable797 ms118 ms0.0 ms
/pagead/managed/js/activeview/current/ufs_web_display.js534 ms453 ms52 ms
assets.adobedtm.com/a48c09ba9d50/1e36ca10b673/launch-ea90f2ac46ad.min.js392 ms327 ms38 ms
www.googletagmanager.com/gtag/js?id=AW-823154227&cx=c&gtm=4e64h1348 ms297 ms49 ms
www.googletagmanager.com/gtag/js?id=G-KQG7WRFJWG&cx=c&gtm=4e64h1330 ms280 ms44 ms
www.googletagmanager.com/gtag/js?id=AW-1070246774&l=dataLayer275 ms232 ms41 ms
www.googletagmanager.com/gtag/js?id=AW-975347983&cx=c&gtm=4e64h1272 ms155 ms57 ms
www.eurekalert.org/build/app.73156b0e.js229 ms168 ms48 ms
connect.facebook.net/en_US/fbevents.js115 ms87 ms27 ms
js-agent.newrelic.com/nr-spa-1.313.0.min.js111 ms92 ms7.6 ms
/signals/config/2654080238088440?v=2.9.303&r=stable&domai...99 ms85 ms14 ms
www.googletagservices.com/tag/js/gpt.js76 ms66 ms8.5 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 Evaluation6.1 s
Script Parsing & Compilation973 ms
Other781 ms
Style & Layout315 ms
Garbage Collection149 ms
Parse HTML & CSS106 ms
Rendering72 ms

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
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer.js5.2 MiB
www.eurekalert.org/build/app.73156b0e.js413.8 KiB
www.eurekalert.org/build/app.5767a7ce.css203.0 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...187.4 KiB
www.googletagmanager.com/gtag/js?id=G-KQG7WRFJWG&cx=c&gtm=4e64h1172.0 KiB
www.eurekalert.org/build/0.2d5a26c8.js146.0 KiB
www.googletagmanager.com/gtag/js?id=AW-823154227&cx=c&gtm=4e64h1144.6 KiB
tpc.googlesyndication.com/simgad/11145741928525800709140.4 KiB
www.googletagmanager.com/gtag/js?id=AW-1070246774&l=dataLayer138.0 KiB
www.googletagmanager.com/gtag/js?id=AW-975347983&cx=c&gtm=4e64h1137.8 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/square-logo-webp-61e9ce6638ed0279651159.webp
IMAGE div.col-sm-7 > article.trending > a > img
/Api/v1/Multimedia/0febe447-a559-473e-83bf-ba6e356d7df5/R...
IMAGE article.trending > a > div.thumb > img
/Api/v1/Multimedia/eb21929e-e749-4f51-8eab-3e05ae971012/R...
IMAGE article.trending > a > div.thumb > img
/Api/v1/Multimedia/8b6edfc0-af40-4846-8ad4-565cde214be5/R...
IMAGE article.trending > a > div.thumb > img
/Api/v1/Multimedia/a32454cd-fe90-4d40-b851-03b8f55a9083/R...
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/wpi-stacked-6597042621f41381516210.webp
EurekAlert! Science News div.clearfix > div.col-md-6 > a.logo > img
www.eurekalert.org/images/logo-2x.png
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
/images/uploads/acs-18148-2026-spring-meeting-eureka-aler...
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
/images/uploads/nutrition-logo-square-69c2e13756cfb058065...
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
/images/uploads/acs-chemistry-for-life-2color-rbg-logo-65...
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/300x250-66ec251bf0e1e972115578.webp
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
/images/uploads/spj24-eurekalert-banner300x250-1-6810f105...
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
/images/uploads/parkinson-s-awareness-1-69cd11e5ad50d4264...
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/cancer_research_square_202412.webp
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/marine_science_square_202412.webp
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
www.eurekalert.org/images/uploads/climate_change_square_202412.webp
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
/images/uploads/nih-master-logo-mark-2color-61659fb9b6ba7...
A service of the American Association for the Advancement of Science div.clearfix > div.col-md-6 > a.brand > img
www.eurekalert.org/images/brand.png
AAAS - American Association for the Advancement of Science div.row > div.col-sm-5 > p.brand > img
www.eurekalert.org/images/brand.png
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
www.eurekalert.org/images/uploads/doe-616706ce1dcf5908761926.webp
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
www.eurekalert.org/images/uploads/nsf-homepage-6167beda9b896028132993.webp
EurekAlert! The Global Source for Science News div.row > div.col-sm-5 > p.logo > img
www.eurekalert.org/images/logo-footer.png

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

●Optimize DOM size
●Forced reflow
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 5 user timings
●Avoid long main-thread tasks 20 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 160 ms
●Server Backend Latencies 210 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 270 ms
○INP breakdown
○Avoid non-composited animations
83

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.container > div.clearfix > div.search-wrapper > button.search-btn div.container > div.clearfix > div.search-wrapper > button.search-btn

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
div.widget > a > div.image-box > img div.widget > a > div.image-box > img

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.card-body > div.row > div.col-xs-3 > a.list-group-item div.card-body > div.row > div.col-xs-3 > a.list-group-item
div.card > div.row > div.col-xs-3 > a.list-group-item div.card > div.row > div.col-xs-3 > a.list-group-item
div#accordionExample > div.row > div.col-xs-3 > a.list-group-item div#accordionExample > div.row > div.col-xs-3 > a.list-group-item
div.row > aside#sidebar-content > div.widget > a div.row > aside#sidebar-content > div.widget > a

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.

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
UNIVERSITY OF FLORIDA article.trending > a > header > p.meta_institute
UNIVERSITY OF MALTA article.trending > a > header > p.meta_institute
EDITORIAL OFFICE OF WEST CHINA SCHOOL OF STOMATOLOGY, SICHUAN UNIVERSITY article.trending > a > header > p.meta_institute
NYU LANGONE HEALTH / NYU GROSSMAN SCHOOL OF MEDICINE article.trending > a > header > p.meta_institute
UCI HEALTH article.trending > a > header > p.meta_institute
WASHINGTON STATE UNIVERSITY article.trending > a > header > p.meta_institute
UNIVERSITÉ DE GENÈVE article.trending > a > header > p.meta_institute
VIEW MORE NEWS  div#main-content > div.row > div.col-sm-7 > a.view-all
NUTRITION 2026 a > div.microsite-card__inner > div.microsite-card__body > div.microsite-card__title
Tsinghua University Press a > div.microsite-card__inner > div.microsite-card__body > div.microsite-card__title
#EurekAlertStaffPicks newsletter section.widget > div.thumbnail > div.caption > a

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]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●`[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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●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.
●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
○`[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.
○`[role]`s are contained by their required parent element
○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
○Form elements have associated labels
○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.
○Identical links have the same purpose.
○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.
81

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
AttributionReporting
connect.facebook.net/en_US/fbevents.js line 279, col 769

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
www.eurekalert.org/build/@mediakind/mkplayer/mkplayer.js
●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 browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
82

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.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
a > div.microsite-card__inner > div.microsite-card__image > img a > div.microsite-card__inner > div.microsite-card__image > img
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
div.row > div.col-xs-3 > a.list-group-item > img div.row > div.col-xs-3 > a.list-group-item > img
div.widget > a > div.image-box > img div.widget > a > div.image-box > img

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●Document has a valid `hreflang`
○robots.txt is valid
○Document has a valid `rel=canonical`

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