Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

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.

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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:159.658 source:map[column:7928 line:0 type:source-location url:https://www.sciencefocus.com/2922.c9d808ae11053d2b.js urlProvider:network]]]

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.

	URL	Resource Size	Est Savings
storefront-element > storefront-html.home-banner > a > img `storefront-element > storefront-html.home-banner > a > img`	/uploads/sites/41/2026/03/Brandsite-MidPage-ScienceFocus-...	142.1 KiB	121.7 KiB
© Skydio `storefront-content > a.content-image > storefront-image.loaded > img.loaded`	/uploads/sites/41/2022/06/Cool-gadgets-large-1a076f1.jpg?...	126.3 KiB	83.2 KiB
Woman doing breathing exercises `storefront-content > a.content-image > storefront-image.loaded > img.loaded`	c02.purpledshub.com/uploads/sites/41/2023/07/anxiety-edd512f.jpg?w=900&webp=1	93.5 KiB	50.5 KiB
Computer code for malicious hacking, phishing, or spam. `storefront-content > a.content-image > storefront-image.loaded > img.loaded`	c02.purpledshub.com/uploads/sites/41/2026/04/hack.jpg?w=900&webp=1	70.2 KiB	29.4 KiB
Macaque monkey in Gibraltar eating a biscuit `storefront-content > a.content-image > storefront-image.loaded > img.loaded`	c02.purpledshub.com/uploads/sites/41/2026/04/Monkey-soil.jpg?w=900&webp=1	56.5 KiB	28.8 KiB
Man with beard looking surprised by fun facts. `storefront-content > a.content-image > storefront-image.loaded > img.loaded`	c02.purpledshub.com/uploads/sites/41/2023/07/Surprised-man.jpg?w=900&webp=1	54.2 KiB	27.6 KiB
Small electric white buggy being driven. `storefront-content.post-format-gallery > a.content-image > storefront-image.loaded > img.loaded`	c02.purpledshub.com/uploads/sites/41/2024/01/Sinclair-C5-Clive.jpg?w=900&webp=1	65.0 KiB	27.2 KiB
head > meta `head > meta`	/dynamic/2/11256269/s3-bridge-prd-doubleclick.hogarth.ai/...	18.1 KiB	17.7 KiB
The Instant Genius logo `storefront-content.post-format-audio > a.content-image > storefront-image.loaded > img.loaded`	/uploads/sites/41/2023/08/instant-genius-thumbnail.jpg?w=...	38.5 KiB	17.5 KiB
storefront-content.sponsor-type-native-advertorial > a.content-image > storefront-image.loaded > img.loaded `storefront-content.sponsor-type-native-advertorial > a.content-image > storefront-image.loaded > img.loaded`	/uploads/sites/41/2025/12/GettyImages-1442157422-1-scaled...	39.9 KiB	16.7 KiB

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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.

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.

Request	Cache TTL	Transfer Size
prebid.the-ozone-project.com/hw2/builds/ozwrap_pbjs.js	14400.0 s	187.4 KiB
/signals/config/770882284503070?v=2.9.303&r=stable&domain...	1200.0 s	125.6 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
cdn.privacy-mgmt.com/Notice.8f529.js	3600.0 s	91.2 KiB
silo90.p7cloud.net/as1.js?uri=https://www.sciencefocus.com	3600.0 s	51.0 KiB
cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js	3600.0 s	42.5 KiB
cdn-magiclinks.trackonomics.net/client/static/v2/ourmedia_8b595_sciencefocus.js	0.0 ms	30.5 KiB
s0.2mdn.net/879366/html_inpage_rendering_lib_200_287.js	86400.0 s	59.8 KiB
s0.2mdn.net/879366/Enabler_01_262.js	86400.0 s	41.2 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.0 KiB
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
prebid.the-ozone-project.com/hw2/OZONEOM00001/1500000109/current/ozpb.min.js	14400.0 s	8.2 KiB
cdn.privacy-mgmt.com/Notice.30929.css	3600.0 s	6.7 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
prebid.the-ozone-project.com/hw2/builds/default-plugin.js	14400.0 s	4.1 KiB
cdn.privacy-mgmt.com/polyfills.01516.js	3600.0 s	2.3 KiB
pagead2.googlesyndication.com/pagead/js/r20260421/r20110914/abg_lite.js	1209600.0 s	10.5 KiB
/pagead/js/r20260421/r20110914/client/qs_click_protection...	1209600.0 s	8.6 KiB
prebid.the-ozone-project.com/hw2/OZONEOM00001/1500000109/current/adUnits.min.js	14400.0 s	926 B
/p.png?visit=page&arcid=8f5f3188-b7fa-4ea5-9fbd-3db0ed7bf...	0.0 ms	534 B
/p.png?visit=custom&arcid=8f5f3188-b7fa-4ea5-9fbd-3db0ed7...	0.0 ms	534 B
/cookie?redirect_url=https%3A%2F%2Felb.the-ozone-project....	0.0 ms	484 B
/pagead/js/r20260421/r20110914/elements/html/omrhp.js	1209600.0 s	4.7 KiB
/i/m/i.png?q=N4IghgLhBOD6BmB7aB3M0AmBLAdgcxAC5gBfAGhAFsBT...	0.0 ms	464 B
ua.p7cloud.net/asp?aspan=YXJjc3Bhbi11c2VyOmFyY3NwYW4tZHJvd3NzYXA	0.0 ms	322 B
/13333?uri=8f5f3188-b7fa-4ea5-9fbd-3db0ed7bf390&region=eu	0.0 ms	285 B
/track/cmb/generic?ttd_pid=tapad&ttd_tpi=1&ttd_puid=c1039...	0.0 ms	254 B
/track/cmb/generic?ttd_pid=u40cpuw&ttd_tpi=1&gdpr=0&gdpr_...	0.0 ms	254 B
/pagead/js/r20260421/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.6 KiB
/tr/?id=770882284503070&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
www.facebook.com/tr?id=770882284503070&ev=PageView&noscript=1	0.0 ms	16 B
/tr/?id=770882284503070&ev=ArcSpanCohort_J34KZnN4&dl=http...	0.0 ms	16 B
/tr/?id=770882284503070&ev=ArcSpanCohort_mMaSBf7K&dl=http...	0.0 ms	16 B
/tr/?id=770882284503070&ev=ArcSpanCohort_Eh9nVqEa&dl=http...	0.0 ms	16 B
/tr/?id=770882284503070&ev=ArcSpanCohort_UJot6EzP&dl=http...	0.0 ms	16 B
/tr/?id=770882284503070&ev=ArcSpanCohort_TetobwRC&dl=http...	0.0 ms	16 B
/tr/?id=770882284503070&ev=ArcSpanCohort_CacpYodP&dl=http...	0.0 ms	16 B
/tr/?id=770882284503070&ev=ArcSpanCohort_SmMwYJcQ&dl=http...	0.0 ms	16 B

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.

URL	Est Savings
/delivery/web/dynamicResources/6ab86ca8-b028-4715-93c8-27...	15 ms
/delivery/web/dynamicResources/6ab86ca8-b028-4715-93c8-27...	10 ms
/delivery/web/dynamicResources/6ab86ca8-b028-4715-93c8-27...	10 ms
/delivery/web/dynamicResources/6ab86ca8-b028-4715-93c8-27...	10 ms
/sadbundle/4352893413389935958/fonts/googlesanstext-mediu...	10 ms
/sadbundle/4352893413389935958/fonts/GoogleSans-latin-sub...	10 ms
/delivery/web/dynamicResources/6ab86ca8-b028-4715-93c8-27...	5.0 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: 1.0 s

URL	Time Spent
sciencefocus.com/	1.0 s
www.sciencefocus.com/	0.0 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: 1.2 s 697.7 KiB

URL	Transfer Size	Est Savings
www.sciencefocus.com/main.11dfe4fa53342d3f.js	413.6 KiB	204.4 KiB
prebid.the-ozone-project.com/hw2/builds/ozwrap_pbjs.js	187.2 KiB	122.3 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	187.7 KiB	93.6 KiB
www.googletagmanager.com/gtag/js?id=G-M63EGSJJX8&cx=c&gtm=4e64k0	158.5 KiB	65.5 KiB
www.googletagmanager.com/gtag/js?id=G-TELB6ZBBE3&cx=c&gtm=4e64k0	157.3 KiB	64.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-TN65JF9	135.1 KiB	58.5 KiB
/signals/config/770882284503070?v=2.9.303&r=stable&domain...	125.5 KiB	34.6 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	32.5 KiB
	28.0 KiB	22.1 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.

URL	Total CPU Time	Script Evaluation	Script Parse
www.sciencefocus.com/main.11dfe4fa53342d3f.js	11.3 s	9.5 s	19 ms
Unattributable	2.1 s	584 ms	0.0 ms
www.sciencefocus.com/	2.0 s	13 ms	1.2 ms
www.sciencefocus.com/polyfills.11b6e68fc4d48357.js	1.5 s	1.3 s	0.6 ms
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	1.0 s	864 ms	115 ms
www.sciencefocus.com/2922.c9d808ae11053d2b.js	691 ms	0.0 ms	0.1 ms
prebid.the-ozone-project.com/hw2/builds/ozwrap_pbjs.js	471 ms	392 ms	66 ms
www.googletagmanager.com/gtag/js?id=G-M63EGSJJX8&cx=c&gtm=4e64k0	442 ms	375 ms	62 ms
/signals/config/770882284503070?v=2.9.303&r=stable&domain...	364 ms	305 ms	58 ms
www.googletagmanager.com/gtm.js?id=GTM-TN65JF9	320 ms	253 ms	54 ms
scripts.clarity.ms/0.8.59/clarity.js	269 ms	251 ms	9.6 ms
www.googletagmanager.com/gtag/js?id=G-TELB6ZBBE3&cx=c&gtm=4e64k0	263 ms	192 ms	68 ms
ep2.adtrafficquality.google/sodar/sodar2.js	228 ms	221 ms	2.9 ms
cdn-magiclinks.trackonomics.net/client/static/v2/ourmedia_8b595_sciencefocus.js	162 ms	147 ms	13 ms
connect.facebook.net/en_US/fbevents.js	160 ms	116 ms	42 ms
cdn.privacy-mgmt.com/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.js	133 ms	107 ms	23 ms
silo90.p7cloud.net/as1.js?uri=https://www.sciencefocus.com	121 ms	77 ms	36 ms
cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js	119 ms	100 ms	17 ms
www.sciencefocus.com/9207.47ce71424b5c9934.js	114 ms	104 ms	0.2 ms
securepubads.g.doubleclick.net/tag/js/gpt.js?network-code=22879518088	96 ms	82 ms	12 ms
fundingchoicesmessages.google.com/i/22879518088?ers=3	75 ms	71 ms	2.8 ms
www.sciencefocus.com/9131.781ef980885d6fe4.js	68 ms	66 ms	0.2 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.

Category	Time Spent
Script Evaluation	15.8 s
Other	2.5 s
Parse HTML & CSS	1.8 s
Style & Layout	1.5 s
Script Parsing & Compilation	629 ms
Rendering	351 ms
Garbage Collection	294 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 reason	Failure type
The page has an unload handler in a sub frame.	Actionable

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 6.5 KiB

URL	Transfer Size	Est Savings
/* === WARNING, DO NOT CHANGE FILE === This file is auto-generated using post processing pipelines …	54.2 KiB	6.5 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 13.7 KiB

URL	Transfer Size	Est Savings
	28.0 KiB	13.7 KiB

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 47.7 KiB

URL	Transfer Size	Est Savings
/* === WARNING, DO NOT CHANGE FILE === This file is auto-generated using post processing pipelines …	54.0 KiB	47.7 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.

URL	Transfer Size
www.sciencefocus.com/main.11dfe4fa53342d3f.js	414.1 KiB
/uploads/sites/41/2026/03/Brandsite-Footer-ScienceFocus-1...	218.6 KiB
www.sciencefocus.com/	205.8 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	187.7 KiB
prebid.the-ozone-project.com/hw2/builds/ozwrap_pbjs.js	187.4 KiB
/uploads/sites/41/2024/08/rock-with-face-in-it.jpg?w=900&...	186.7 KiB
www.googletagmanager.com/gtag/js?id=G-M63EGSJJX8&cx=c&gtm=4e64k0	158.5 KiB
www.googletagmanager.com/gtag/js?id=G-TELB6ZBBE3&cx=c&gtm=4e64k0	157.4 KiB
/uploads/sites/41/2026/03/Brandsite-MidPage-ScienceFocus-...	142.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-TN65JF9	135.4 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
Footer banner `storefront-element > storefront-html.footer-banner > a > img`	/uploads/sites/41/2026/03/Brandsite-Footer-ScienceFocus-1...
storefront-element > storefront-html.home-banner > a > img `storefront-element > storefront-html.home-banner > a > img`	/uploads/sites/41/2026/03/Brandsite-MidPage-ScienceFocus-...
storefront-section > storefront-element > storefront-html.home-banner > img `storefront-section > storefront-element > storefront-html.home-banner > img`

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

●Render blocking requests

●Optimize viewport for mobile

●User Timing marks and measures 54 user timings

●Avoid long main-thread tasks 20 long tasks found

●Network Requests

●Network Round Trip Times 80 ms

●Server Backend Latencies 520 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 10 ms

○INP breakdown

○Avoid non-composited animations

○Avoid large layout shifts

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
storefront-section.header-mobile-left-elements > storefront-element > storefront-button.menu-icon-button > button.mat-ripple `storefront-section.header-mobile-left-elements > storefront-element > storefront-button.menu-icon-button > button.mat-ripple`
storefront-section.header-mobile-right-elements > storefront-element > storefront-button.user > button `storefront-section.header-mobile-right-elements > storefront-element > storefront-button.user > button`
storefront-section.header-mobile-right-elements > storefront-element > storefront-button.search > button `storefront-section.header-mobile-right-elements > storefront-element > storefront-button.search > button`
ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text `ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text`
ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text `ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text`
ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text `ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text`
ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text `ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text`
ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text `ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text`
ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text `ul.menu-content > li.menu-item > storefront-button.menu-button > button.has-text`

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
storefront-element > storefront-html.home-banner > a > img `storefront-element > storefront-html.home-banner > a > img`
storefront-section > storefront-element > storefront-html.home-banner > img `storefront-section > storefront-element > storefront-html.home-banner > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > 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
storefront-section.header-mobile > storefront-element > storefront-html.header-mobile-logo > a `storefront-section.header-mobile > storefront-element > storefront-html.header-mobile-logo > a`
storefront-section > storefront-element > storefront-html.home-banner > a `storefront-section > storefront-element > storefront-html.home-banner > a`
storefront-section.footer-top-elements > storefront-element > storefront-html.footer-top-logo > a `storefront-section.footer-top-elements > storefront-element > storefront-html.footer-top-logo > a`
li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon `li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon`
li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon `li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon`
li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon `li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon`
li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon `li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon`
li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon `li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon`
li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon `li.menu-item > storefront-button.menu-button > button.has-text > a.button-icon`

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.

○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

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●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

●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

○`[aria-hidden="true"]` elements do not contain focusable descendents

○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

○Links are distinguishable without relying on color.

○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.

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 / Warning	Source
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 279, col 769
Topics	prebid.the-ozone-project.com/hw2/builds/ozwrap_pbjs.js line 94, col 1186

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.sciencefocus.com/main.11dfe4fa53342d3f.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

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

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

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
storefront-element > storefront-html.home-banner > a > img `storefront-element > storefront-html.home-banner > a > img`
storefront-section > storefront-element > storefront-html.home-banner > img `storefront-section > storefront-element > storefront-html.home-banner > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > img`
storefront-button.menu-button > button.has-text > a.button-icon > img `storefront-button.menu-button > button.has-text > a.button-icon > 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

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`