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.

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
/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOS...	40 ms

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-0-SECTION

nodeLabel: 10 times the power at a fraction of the cost! The Future is Open! VIEW TEXTBO…

path: 1,HTML,1,BODY,3,DIV,1,DIV,0,DIV,0,DIV,3,DIV,0,DIV,0,MAIN,0,SECTION,1,DIV,0,DIV,0,ARTICLE,1,DIV,1,SECTION

selector: div.content > article.node > div.node__content > section.home-1-banner

snippet: <section class="home-1-banner dt-section d-flex align-items-center justify-content-center" style="">

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

value: No additional origins are good candidates for preconnecting

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.

URL	Transfer Size	Duration
libretexts.org/themes/contrib/bootstrap_barrio/css/components/field.css?sz83xb	742 B
/themes/contrib/bootstrap_barrio/css/components/tablesort...	243 B
/themes/contrib/bootstrap_barrio/css/components/tablesele...	270 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/views.css?sz83xb	435 B
/themes/contrib/bootstrap_barrio/css/components/ui-dialog...	448 B
/themes/contrib/bootstrap_barrio/css/components/vertical-...	575 B
libretexts.org/core/modules/system/css/components/clearfix.module.css?sz83xb	446 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/tabs.css?sz83xb	172 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/help.css?sz83xb	400 B
/themes/contrib/bootstrap_barrio/css/components/site-foot...	1.3 KiB
libretexts.org/themes/contrib/bootstrap_barrio/css/components/affix.css?sz83xb	202 B
/themes/contrib/bootstrap_barrio/css/components/tabledrag...	311 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/page.css?sz83xb	344 B
/themes/contrib/bootstrap_barrio/css/components/ui.widget...	225 B
/themes/contrib/bootstrap_barrio/css/components/skip-link...	336 B
/themes/contrib/bootstrap_barrio/css/components/item-list...	327 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/toolbar.css?sz83xb	248 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/sidebar.css?sz83xb	332 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/media.css?sz83xb	782 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/book.css?sz83xb	219 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/user.css?sz83xb	779 B
/themes/contrib/bootstrap_barrio/css/components/shortcut....	368 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/node.css?sz83xb	595 B
/themes/contrib/bootstrap_barrio/css/components/variables...	225 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/table.css?sz83xb	575 B
/themes/contrib/bootstrap_barrio/css/components/search-fo...	275 B
/themes/contrib/bootstrap_barrio/css/components/image-but...	217 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/header.css?sz83xb	320 B
libretexts.org/themes/contrib/bootstrap_barrio/fonts/dosis_opensans.css?sz83xb	224 B
/themes/contrib/bootstrap_barrio/css/components/progress....	156 B
libretexts.org/modules/contrib/addtoany/css/addtoany.css?sz83xb	474 B
/themes/contrib/bootstrap_barrio/css/components/feed-icon...	235 B
libretexts.org/core/modules/system/css/components/align.module.css?sz83xb	296 B
libretexts.org/core/modules/system/css/components/item-list.module.css?sz83xb	247 B
/core/modules/system/css/components/position-container.mo...	182 B
libretexts.org/core/modules/system/css/components/nowrap.module.css?sz83xb	192 B
/themes/contrib/bootstrap_barrio/css/components/contextua...	207 B
/themes/contrib/bootstrap_barrio/css/components/list-grou...	241 B
libretexts.org/themes/contrib/bootstrap_barrio/css/components/icons.css?sz83xb	567 B
libretexts.org/core/modules/system/css/components/hidden.module.css?sz83xb	722 B
libretexts.org/modules/contrib/paragraphs/css/paragraphs.unpublished.css?sz83xb	179 B
libretexts.org/core/modules/views/css/views.module.css?sz83xb	396 B
libretexts.org/core/modules/system/css/components/tablesort.module.css?sz83xb	285 B
/themes/custom/edu_care/assets/vendor/font-awesome/css/al...	22.9 KiB	302 ms
libretexts.org/core/modules/system/css/components/fieldgroup.module.css?sz83xb	168 B
libretexts.org/core/modules/system/css/components/resize.module.css?sz83xb	239 B
/core/modules/system/css/components/container-inline.modu...	256 B
libretexts.org/themes/custom/edu_care/css/style.css?sz83xb	27.5 KiB	302 ms
libretexts.org/core/modules/system/css/components/js.module.css?sz83xb	431 B
libretexts.org/libraries/bootstrap/dist/css/bootstrap.min.css?sz83xb	23.8 KiB	302 ms
/core/modules/system/css/components/reset-appearance.modu...	257 B
/core/modules/system/css/components/system-status-counter...	374 B
libretexts.org/core/modules/system/css/components/details.module.css?sz83xb	204 B
/themes/custom/edu_care/assets/vendor/css/owl-carousel/ow...	1.1 KiB
/core/modules/system/css/components/system-status-report-...	244 B
/themes/custom/edu_care/assets/vendor/css/swiper/swiper-b...	4.5 KiB
/themes/custom/edu_care/assets/vendor/css/fancy-box/fancy...	3.5 KiB
libretexts.org/themes/custom/edu_care/color/color-scheme.css?sz83xb	1.9 KiB	151 ms
/core/modules/system/css/components/system-status-report-...	430 B
/themes/custom/edu_care/assets/vendor/css/owl-carousel/ow...	500 B
fonts.googleapis.com/css?family=Open+Sans\|Dosis:400,800	2.1 KiB	758 ms
libretexts.org/themes/custom/edu_care/css/colors.css?sz83xb	666 B
libretexts.org/themes/custom/edu_care/css/custom.css?sz83xb	123 B
libretexts.org/themes/contrib/bootstrap_barrio/css/colors/colors.css?sz83xb	507 B

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
cdn.libretexts.net/Icons/libretexts.png	691200.0 s	56.0 KiB
cdn.libretexts.net/Icons/full_logo.png	691200.0 s	48.5 KiB
static.addtoany.com/menu/page.js	86400.0 s	2.2 KiB
libretexts.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	2871.0 s	733 B
cdn.libretexts.net/libreone-launchpad-widget.min.js	691200.0 s	2.8 KiB
cdn.libretexts.net/libretexts-support-widget.min.js	691200.0 s	2.7 KiB
cdn.libretexts.net/Icons/launchpad-rocket-icon.svg	691200.0 s	945 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.

	URL	Resource Size	Est Savings
Benny the Owl leaning against the LibreTexts logo `div.content-wrapper > div.img-wrapper > a > img`	libretexts.org/sites/default/files/2025-08/benny_leaning_lt_trans.png	1.6 MiB	1.6 MiB
div.row > div.col-12 > div.audio-video-block > div.video1 `div.row > div.col-12 > div.audio-video-block > div.video1`	libretexts.org/sites/default/files/2025-01/libretextsvideointro.png	1.4 MiB	885.8 KiB
Selfie of a woman and her golden retriever looking straight into the camera `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-02/img_2235.jpg	532.1 KiB	531.0 KiB
Diagram with four sections (Training, Content, Development, Technology) radiati… `div.col-12 > div.first-block > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-04/libretextscorevalues.png	496.3 KiB	461.6 KiB
Dr. Reitzel in front a customized LibreTexts backdrop `div.content-block > div.info-content > div.img-wrapper > img`	/sites/default/files/2025-01/armeda_reitzel_libretexts_oc...	325.0 KiB	324.7 KiB
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png	110.7 KiB	109.9 KiB
Professional headshot of a woman with blonde hair pulled back in a ponytail wea… `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/heather_evans_2a_0.jpg	100.2 KiB	99.2 KiB
Headshot of a woman in a black sweater against a neutral backdrop `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/ying_liu_0.jpg	90.8 KiB	89.9 KiB
Home `div.container-fluid > div#block-edu-care-site-branding > a.navbar-brand > img.img-fluid`	libretexts.org/sites/default/files/LibreTexts_logo_full_nobg.png	68.8 KiB	65.0 KiB
Headshot of a woman in a purple blazer smiling in front of a neutral backdrop `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/kim_profile_pic.jpg	43.5 KiB	43.0 KiB
LibreTexts News logo `div.content-wrapper > div.img-wrapper > a > img`	libretexts.org/sites/default/files/2025-06/libretexts_news_1055_x_400_px_1_0.png	41.0 KiB	24.0 KiB
Cristina Moon Portrait `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2024-10/cmoon.jpg	10.4 KiB	9.6 KiB

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 616 ms

URL	Time Spent
libretexts.org/	716 ms

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

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: 150 ms 9.6 KiB

URL	Transfer Size	Est Savings
libretexts.org/themes/custom/edu_care/css/style.css?sz83xb	27.5 KiB	5.0 KiB
/themes/custom/edu_care/assets/vendor/font-awesome/css/al...	22.9 KiB	4.7 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: 600 ms 70.1 KiB

URL	Transfer Size	Est Savings
libretexts.org/themes/custom/edu_care/css/style.css?sz83xb	27.4 KiB	24.7 KiB
/themes/custom/edu_care/assets/vendor/font-awesome/css/al...	22.8 KiB	22.7 KiB
libretexts.org/libraries/bootstrap/dist/css/bootstrap.min.css?sz83xb	23.7 KiB	22.7 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: 250 ms 79.2 KiB

URL	Transfer Size	Est Savings
/themes/custom/edu_care/assets/vendor/js/swiper/swiper-bu...	39.1 KiB	32.9 KiB
/themes/custom/edu_care/assets/vendor/js/fancy-box/fancyb...	29.5 KiB	25.2 KiB
static.addtoany.com/menu/modules/core.ydpp7jcu.js	25.8 KiB	21.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Other	2.5 s
Style & Layout	1.3 s
Script Evaluation	1.2 s
Rendering	476 ms
Parse HTML & CSS	319 ms
Script Parsing & Compilation	83 ms

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 4.9 KiB

URL	Transfer Size	Est Savings
libretexts.org/core/misc/drupal.js?v=10.4.6	6.3 KiB	4.9 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
libretexts.org/sites/default/files/2025-08/benny_leaning_lt_trans.png	1.6 MiB
libretexts.org/sites/default/files/2025-01/libretextsvideointro.png	1.4 MiB
libretexts.org/sites/default/files/featured_images/BennyLogoLeaningNoBG.png	826.8 KiB
libretexts.org/sites/default/files/2025-01/benny_blank_bricks_0.png	538.7 KiB
libretexts.org/sites/default/files/2025-02/img_2235.jpg	532.8 KiB
libretexts.org/sites/default/files/2025-04/libretextscorevalues.png	496.9 KiB
/sites/default/files/2025-01/armeda_reitzel_libretexts_oc...	325.5 KiB
libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png	110.9 KiB
libretexts.org/sites/default/files/2025-01/heather_evans_2a_0.jpg	100.4 KiB
libretexts.org/sites/default/files/2025-01/ying_liu_0.jpg	91.0 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
Benny the Owl leaning against the LibreTexts logo `div.content-wrapper > div.img-wrapper > a > img`	libretexts.org/sites/default/files/2025-08/benny_leaning_lt_trans.png
Selfie of a woman and her golden retriever looking straight into the camera `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-02/img_2235.jpg
Selfie of a woman and her golden retriever looking straight into the camera `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-02/img_2235.jpg
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
div.content-block > div.info-content > div.img-wrapper > img `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/default_images/Benny%20Mascot%20White_0.png
Home `div.bottom-content > div#block-edu-care-site-branding > a.navbar-brand > img.img-fluid`	libretexts.org/sites/default/files/LibreTexts_logo_full_nobg.png
LibreTexts News logo `div.content-wrapper > div.img-wrapper > a > img`	libretexts.org/sites/default/files/2025-06/libretexts_news_1055_x_400_px_1_0.png
LibreTexts News logo `div.content-wrapper > div.img-wrapper > a > img`	libretexts.org/sites/default/files/2025-06/libretexts_news_1055_x_400_px_1_0.png
Headshot of a woman in a black sweater against a neutral backdrop `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/ying_liu_0.jpg
Headshot of a woman in a black sweater against a neutral backdrop `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/ying_liu_0.jpg
Professional headshot of a woman with blonde hair pulled back in a ponytail wea… `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/heather_evans_2a_0.jpg
Professional headshot of a woman with blonde hair pulled back in a ponytail wea… `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/heather_evans_2a_0.jpg
Dr. Reitzel in front a customized LibreTexts backdrop `div.content-block > div.info-content > div.img-wrapper > img`	/sites/default/files/2025-01/armeda_reitzel_libretexts_oc...
Dr. Reitzel in front a customized LibreTexts backdrop `div.content-block > div.info-content > div.img-wrapper > img`	/sites/default/files/2025-01/armeda_reitzel_libretexts_oc...
Headshot of a woman in a purple blazer smiling in front of a neutral backdrop `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/kim_profile_pic.jpg
Headshot of a woman in a purple blazer smiling in front of a neutral backdrop `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2025-01/kim_profile_pic.jpg
Cristina Moon Portrait `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2024-10/cmoon.jpg
headshot of a woman `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2024-10/cmoon.jpg
Cristina Moon Portrait `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2024-10/cmoon.jpg
headshot of a woman `div.content-block > div.info-content > div.img-wrapper > img`	libretexts.org/sites/default/files/2024-10/cmoon.jpg

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

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●JavaScript execution time 1.1 s

●Avoid long main-thread tasks 12 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 10 ms

●Server Backend Latencies 50 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Avoid large layout shifts 8 layout shifts found

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

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.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`
div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot `div.carousel1 > div.owl-carousel > div.owl-dots > button.owl-dot`

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.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
500+ `div.row > div.col-12 > div.counter-content > h3`
Content `div.body-content > div.elementor-element > div.elementor-widget-container > h4`
Textbook Libraries `div.content > div.main-content > a.icon > h5`
LibreTexts March 2026 Newsletter `div.col-lg-4 > div.content-wrapper > div.content-wrapper > h4`
Brian Lindshield `div.content-block > div.info-content > div.details > h6`
Quick Links `div.row > div.col-12 > nav#block-quicklinks > h4#block-quicklinks-menu`
Faculty Information: `div.col-12 > nav#block-contactus > div.footer-info > h6`

These are opportunities to improve keyboard navigation in your application.

○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

●Image elements have `[alt]` attributes

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●`button`, `link`, and `menuitem` elements have accessible names

●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

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<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.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○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

○`<frame>` or `<iframe>` elements have a title

○`<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>`.

○Image elements do not have `[alt]` attributes that are redundant text.

○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.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●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

●Page has valid source maps

○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

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.

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
libretexts.org/blog/libretexts-march-2026-newsletter	Read More
libretexts.org/blog/libretexts-february-2026-newsletter	Read More
libretexts.org/blog/opened-week-2026-right-around-corner	Read More

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 are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`