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.

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
www.instagram.com/embed.js	1200.0 s	33.8 KiB
static.hotjar.com/c/hotjar-3831866.js?sv=5	60.0 s	6.9 KiB
/v/t51.82787-15/669606766_18567732523002734_8365734126815...	1209600.0 s	63.4 KiB
/v/t51.82787-15/662344000_18573273703062086_5061505532015...	1209600.0 s	56.4 KiB
/v/t51.82787-15/660790862_18573273718062086_1195167372347...	1209600.0 s	43.8 KiB
/v/t51.82787-15/640596559_17905121700369826_3963556214610...	1209600.0 s	7.9 KiB
/v/t51.82787-15/670491793_18575395624062086_2739557069543...	1209600.0 s	6.8 KiB
/v/t51.2885-19/314772925_649510439966450_4105615469657109...	1209600.0 s	6.0 KiB
/v/t51.82787-15/670738363_18569239471002734_4621271509693...	1209600.0 s	5.9 KiB
/v/t51.71878-15/671119518_26336742349350639_4412270294756...	1209600.0 s	4.8 KiB
/v/t51.82787-19/625227618_17892439938411035_6809477430629...	1209600.0 s	4.7 KiB
cdn-cookieyes.com/assets/images/close.svg	36000.0 s	836 B
/v/t51.2885-19/497234874_18494351410002734_36202437591312...	1209600.0 s	3.2 KiB
/p.css?s=1&k=bfk1gyk&ht=tk&f=8482.8483.8484.8485.8486.848...	604800.0 s	172 B
/v/t51.82787-15/662344000_18573273703062086_5061505532015...	1209600.0 s	0 B
/v/t51.82787-15/660790862_18573273718062086_1195167372347...	1209600.0 s	0 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:48.391 source:map[column:7635 line:3 type:source-location url:https://usc.edu/wp-content/themes/usc-communications-2023/pattern_lab/source/js/vendor/lazysizes.min.js?ver=6dba6788621f5ccf5f56dd urlProvider:network]]]

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

items: [map[reflowTime:48.391 source:map[column:3790 line:2 type:source-location url:https://usc.edu/wp-content/themes/usc-communications-2023/pattern_lab/source/js/vendor/lazysizes.min.js?ver=6dba6788621f5ccf5f56dd urlProvider:network]] map[reflowTime:0.61 source:map[column:34240 line:9 type:source-location url:https://usc.edu/wp-content/themes/usc-communications-2023/pattern_lab/source/js/vendor/ScrollTrigger.min.js?ver=6dba6788621f5ccf5f56dd urlProvider:network]] map[reflowTime:19.518 source:map[column:13599 line:9 type:source-location url:https://usc.edu/wp-content/themes/usc-communications-2023/pattern_lab/source/js/vendor/ScrollTrigger.min.js?ver=6dba6788621f5ccf5f56dd urlProvider:network]] map[reflowTime:0.255 source:map[column:12848 line:9 type:source-location url:https://usc.edu/wp-content/themes/usc-communications-2023/pattern_lab/source/js/vendor/ScrollTrigger.min.js?ver=6dba6788621f5ccf5f56dd urlProvider:network]] map[reflowTime:0.378 source:map[column:16991 line:9 type:source-location url:https://usc.edu/wp-content/themes/usc-communications-2023/pattern_lab/source/js/vendor/ScrollTrigger.min.js?ver=6dba6788621f5ccf5f56dd urlProvider:network]] map[reflowTime:0.112 source:map[type:text value:[unattributed]]]]

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
Group of individuals pose in a formal room with U.S. flags behind them. `div.photos-container > div.photo > div.f--field > img`	usc.edu/wp-content/uploads/2026/04/CPC_group-photo_0-768x432.png	180.9 KiB	165.4 KiB
Festival of Books `div.featured-card > div.f--field > a > img.lazyloaded`	usc.edu/wp-content/uploads/2026/04/20260418_festival_of_books_3-768x432.jpg	130.3 KiB	117.6 KiB
Sarah Feakins, Professor of Earth Sciences in Dornsife, leads a team gathering … `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/16420620597_da47c8d8b6_b-Fire...	141.0 KiB	113.4 KiB
Two students stand on campus holding an academic award plaque. `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/1200-x-600-Firefly-Upscaler-2...	135.9 KiB	108.2 KiB
Students on laptops in a class in an auditorium at USC Annenberg. `div.image-title-container > div.image-container > div.f--field > img.ls-is-cached`	/wp-content/uploads/2023/03/USC_ASCJ_ANN_Auditorium_20190...	89.2 KiB	74.0 KiB
Geoffrey Garrett at USC Marshall and USC Leventhal scholarship celebration `div.card-inner > div.f--field > a > img`	/wp-content/uploads/2026/02/20260129_MarshallScholarship_...	78.5 KiB	72.3 KiB
Researchers in a lab examine samples and discuss their work. `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/2017103_Keck_Spring__2017_081...	82.6 KiB	58.9 KiB
body.has-emergency-banner `body.has-emergency-banner`	/v/t51.82787-15/669606766_18567732523002734_8365734126815...	63.4 KiB	47.1 KiB
APR 18, 2026 `div.cards-list > div.article-card > div.text-container > div.f--field`	/v/t51.82787-15/662344000_18573273703062086_5061505532015...	56.3 KiB	44.0 KiB
Academic Honors Convocation: David H. Peng, Beong-Soo Kim and Yannis C. Yortsos `div.card-inner > div.f--field > a > img`	usc.edu/wp-content/uploads/2026/04/FAHC_1838-768x432.jpg	47.2 KiB	41.8 KiB
Oliver Mayer `div.card-inner > div.f--field > a > img`	usc.edu/wp-content/uploads/2026/02/250424_USC_Ling-Luo_175_uscn-768x432.jpg	46.8 KiB	41.4 KiB
Students and a faculty member pose on stage holding PR awards. `div.photos-container > div.photo > div.f--field > img`	usc.edu/wp-content/uploads/2026/04/prweek-awards-2026-1-768x432.jpg	56.0 KiB	40.5 KiB
Students in business attire present at the front of a classroom. `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/usc_msb_global_case_comp_wo_2...	47.8 KiB	34.1 KiB
Tommy Trojan with sun in background `div.card-inner > div.f--field > a > img`	usc.edu/wp-content/uploads/2025/06/tommy_2400-768x432.jpg	37.7 KiB	33.4 KiB
Victoria Makanjuola `div.card-inner > div.f--field > a > img`	/wp-content/uploads/2026/04/victoria-makanjuola-online-ms...	35.6 KiB	31.5 KiB
BlockchainSC `div.card-inner > div.f--field > a > img`	/wp-content/uploads/2026/04/ChatGPT-Image-Apr-17-2026-11_...	32.4 KiB	25.2 KiB
USC Fisher Museum welcomes the National Archives’ Freedom Plane National Tour `div.article-card > div.text-container > div.f--field > h3`	static.cdninstagram.com/rsrc.php/v4/yP/r/9NgyF_R7b4t.png	41.8 KiB	13.8 KiB
span#alttext-container > img#alttext-image `span#alttext-container > img#alttext-image`	/v/t51.2885-19/314772925_649510439966450_4105615469657109...	5.9 KiB	5.8 KiB
span#alttext-container > img#alttext-image `span#alttext-container > img#alttext-image`	/v/t51.82787-19/625227618_17892439938411035_6809477430629...	4.7 KiB	4.6 KiB

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-4-IMG

nodeLabel: Students on laptops in a class in an auditorium at USC Annenberg.

path: 4,HTML,2,BODY,5,MAIN,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG

selector: div.image-title-container > div.image-container > div.f--field > img.ls-is-cached

snippet: <img data-src="https://usc.edu/wp-content/uploads/2023/03/USC_ASCJ_ANN_Auditorium_2019091…" data-srcset="https://usc.edu/wp-content/uploads/2023/03/USC_ASCJ_ANN_Auditorium_2019091…" data-sizes="(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw" class=" ls-is-cached lazyloaded" alt="Students on laptops in a class in an auditorium at USC Annenberg." sizes="(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw" srcset="https://usc.edu/wp-content/uploads/2023/03/USC_ASCJ_ANN_Auditorium_2019091…" src="https://usc.edu/wp-content/uploads/2023/03/USC_ASCJ_ANN_Auditorium_2019091…" …>

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.

URL	Transfer Size	Duration
use.typekit.net/bfk1gyk.css?ver=6dba6788621f5ccf5f56dd	1.0 KiB	1.1 s
/css2?family=Source+Sans+Pro%3Aital%2Cwght%400%2C300%3B0%...	1.6 KiB	969 ms
cdn-cookieyes.com/client_data/1b2030d678924bbc9332a40d/script.js	8.6 KiB	1.2 s
/wp-content/themes/usc-communications-2023/pattern_lab/so...	123.6 KiB	4.5 s
/wp-content/themes/usc-communications-2023/pattern_lab/so...	1.4 KiB
/wp-content/plugins/wp-rss-aggregator/core/css/jquery-col...	2.1 KiB
/wp-content/themes/usc-communications-2023/pattern_lab/so...	5.6 KiB
/p.css?s=1&k=bfk1gyk&ht=tk&f=8482.8483.8484.8485.8486.848...	172 B	752 ms

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
/af/3cbd9b/000000000000000000012d68/27/l?primer=7cdcb44be...	10 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.

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: 300 ms 30.8 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/usc-communications-2023/pattern_lab/so...	123.6 KiB	30.8 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: 1.2 s 117.4 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/usc-communications-2023/pattern_lab/so...	123.4 KiB	117.4 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: 1.2 s 188.4 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtm.js?id=GTM-5XS99H7	131.6 KiB	62.7 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	56.1 KiB	37.7 KiB
/wp-content/themes/usc-communications-2023/pattern_lab/so...	51.0 KiB	34.2 KiB
www.instagram.com/embed.js	33.7 KiB	27.7 KiB
www.instagram.com/embed.js	33.7 KiB	26.0 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
usc.edu/	630 ms	327 ms	30 ms
Unattributable	456 ms	22 ms	0.0 ms
/wp-content/themes/usc-communications-2023/pattern_lab/so...	335 ms	101 ms	6.4 ms
www.googletagmanager.com/gtm.js?id=GTM-5XS99H7	289 ms	234 ms	52 ms
/wp-content/themes/usc-communications-2023/pattern_lab/so...	257 ms	49 ms	1.4 ms
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	190 ms	156 ms	31 ms
cdn-cookieyes.com/client_data/1b2030d678924bbc9332a40d/script.js	188 ms	174 ms	3.3 ms
js-agent.newrelic.com/nr-spa-1.313.0.min.js	186 ms	149 ms	15 ms
/wp-content/themes/usc-communications-2023/pattern_lab/so...	151 ms	49 ms	8.9 ms
www.instagram.com/embed.js	116 ms	57 ms	46 ms
cdn-cookieyes.com/client_data/1b2030d678924bbc9332a40d/banner.js	104 ms	60 ms	3.1 ms
/wp-content/themes/usc-communications-2023/pattern_lab/so...	103 ms	71 ms	11 ms
/wp-content/themes/usc-communications-2023/pattern_lab/so...	54 ms	45 ms	9.4 ms
usc.edu/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4	51 ms	48 ms	2.9 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	1.6 s
Other	730 ms
Style & Layout	378 ms
Script Parsing & Compilation	261 ms
Parse HTML & CSS	194 ms
Rendering	86 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

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
usc.edu/wp-content/uploads/2026/04/CPC_group-photo_0-768x432.png	181.2 KiB
www.googletagmanager.com/gtag/js?id=GT-WRDGJJM	159.4 KiB
/wp-content/uploads/2026/04/16420620597_da47c8d8b6_b-Fire...	141.3 KiB
/wp-content/uploads/2026/04/1200-x-600-Firefly-Upscaler-2...	136.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-5XS99H7	131.6 KiB
usc.edu/wp-content/uploads/2026/04/20260418_festival_of_books_3-768x432.jpg	130.6 KiB
/wp-content/themes/usc-communications-2023/pattern_lab/so...	123.6 KiB
/af/3cbd9b/000000000000000000012d68/27/l?primer=7cdcb44be...	95.8 KiB
static.cdninstagram.com/rsrc.php/v4/y6/r/n80KC3B7ON5.js	92.9 KiB
static.cdninstagram.com/rsrc.php/v4/y6/r/U6632FpByU-.js	90.2 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
Researchers in a lab examine samples and discuss their work. `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/2017103_Keck_Spring__2017_081...
Sarah Feakins, Professor of Earth Sciences in Dornsife, leads a team gathering … `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/16420620597_da47c8d8b6_b-Fire...
Two students stand on campus holding an academic award plaque. `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/1200-x-600-Firefly-Upscaler-2...
Students and a faculty member pose on stage holding PR awards. `div.photos-container > div.photo > div.f--field > img`	usc.edu/wp-content/uploads/2026/04/prweek-awards-2026-1-768x432.jpg
Students in business attire present at the front of a classroom. `div.photos-container > div.photo > div.f--field > img`	/wp-content/uploads/2026/04/usc_msb_global_case_comp_wo_2...
Group of individuals pose in a formal room with U.S. flags behind them. `div.photos-container > div.photo > div.f--field > img`	usc.edu/wp-content/uploads/2026/04/CPC_group-photo_0-768x432.png
Festival of Books `div.featured-card > div.f--field > a > img.lazyloaded`	usc.edu/wp-content/uploads/2026/04/20260418_festival_of_books_3-768x432.jpg
Academic Honors Convocation: David H. Peng, Beong-Soo Kim and Yannis C. Yortsos `div.card-inner > div.f--field > a > img`	usc.edu/wp-content/uploads/2026/04/FAHC_1838-768x432.jpg
Victoria Makanjuola `div.card-inner > div.f--field > a > img`	/wp-content/uploads/2026/04/victoria-makanjuola-online-ms...
Geoffrey Garrett at USC Marshall and USC Leventhal scholarship celebration `div.card-inner > div.f--field > a > img`	/wp-content/uploads/2026/02/20260129_MarshallScholarship_...
Oliver Mayer `div.card-inner > div.f--field > a > img`	usc.edu/wp-content/uploads/2026/02/250424_USC_Ling-Luo_175_uscn-768x432.jpg
Tommy Trojan with sun in background `div.card-inner > div.f--field > a > img`	usc.edu/wp-content/uploads/2025/06/tommy_2400-768x432.jpg
USC women’s tennis Big Ten champions `div.article-card > div.f--field > a > img.lazyload`
Members of the USC Trojan Marching Band welcome the Freedom Plane `div.article-card > div.f--field > a > img.lazyload`
Trojan Talks, Episode 7: Beong-Soo Kim and Peter Mancall `div.article-card > div.f--field > a > img.lazyload`
Historic document featuring handwritten text, signatures and red wax seals. `div.text-image-container > div.image-container > div.f--field > img.lazyload`
USC students with hands raised at a spirit rally `div.c--component > div.image-container > div.f--field > img.lazyload`

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●Avoid long main-thread tasks 17 long tasks found

●Network Requests

●Network Round Trip Times 160 ms

●Server Backend Latencies 330 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

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

●Avoid large layout shifts 2 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

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.card-inner > div.text-container > div.f--field > iframe#instagram-embed-0 `div.card-inner > div.text-container > div.f--field > iframe#instagram-embed-0`
div.card-inner > div.text-container > div.f--field > iframe#instagram-embed-1 `div.card-inner > div.text-container > div.f--field > iframe#instagram-embed-1`

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

●Buttons have an accessible name

●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.

●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.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●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

○`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.

○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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

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

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
today.usc.edu/tag/academic-excellence/	LEARN MORE
today.usc.edu/tag/students/	LEARN 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

●Document has a meta description

●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`