Lighthouse Desktop

· 0 checks — Desktop 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:47.129 source:map[type:text value:[unattributed]]] map[reflowTime:13.512 source:map[column:52083 line:1 type:source-location url:https://www.du.edu/core/assets/vendor/jquery/jquery.min.js?v=3.6.3 urlProvider:network]] map[reflowTime:0.251 source:map[column:52780 line:1 type:source-location url:https://www.du.edu/core/assets/vendor/jquery/jquery.min.js?v=3.6.3 urlProvider:network]] map[reflowTime:0.145 source:map[column:52838 line:1 type:source-location url:https://www.du.edu/core/assets/vendor/jquery/jquery.min.js?v=3.6.3 urlProvider:network]] map[reflowTime:0.143 source:map[column:52902 line:1 type:source-location url:https://www.du.edu/core/assets/vendor/jquery/jquery.min.js?v=3.6.3 urlProvider:network]]]

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-IMG

nodeLabel: DU hockey team celebrating Frozen 4

path: 1,HTML,1,BODY,2,DIV,1,DIV,2,DIV,1,HEADER,2,DIV,1,PICTURE,5,IMG

selector: header.header > div.hero-media > picture > img

snippet: <img src="https://www.du.edu/sites/default/files/styles/hero_image_1356_x_538/public…" alt="DU hockey team celebrating Frozen 4">

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/tir4vjc.css	1.7 KiB	207 ms
/p.css?s=1&k=tir4vjc&ht=tk&f=39510.39511.39512.39513.3951...	172 B	234 ms
/sites/default/files/css/css_qY9eAhzcCUdbqhvSNuVzoM9lSINf...	180.2 KiB	360 ms
/sites/default/files/css/css_sl7QUD1H8m-3-HmAxYnsPVDgLlc-...	2.5 KiB

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
app.termly.io/resource-blocker/7ba1b5fc-00c7-40fb-b9cb-ebbd46725653?autoBlock=on	14400.0 s	143.4 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
/signals/config/587955852232025?v=2.9.303&r=stable&domain...	1200.0 s	46.9 KiB
/signals/config/424272042164780?v=2.9.303&r=stable&domain...	1200.0 s	17.2 KiB
/signals/config/846899537469881?v=2.9.303&r=stable&domain...	1200.0 s	16.8 KiB
/signals/config/393220310237778?v=2.9.303&r=stable&domain...	1200.0 s	16.7 KiB
js.adsrvr.org/up_loader.1.1.0.js	0.0 ms	12.3 KiB
pixel.byspotify.com/ping.min.js	3600.0 s	10.3 KiB
cdn.pdst.fm/ping.min.js	3600.0 s	10.3 KiB
tags.srv.stackadapt.com/events.js	5.0 s	7.7 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
app.termly.io/resource-blocker/support/894-6156b36a131577c56e7e.min.js	14400.0 s	8.4 KiB
/embed/199549536ad032ec6265355bdabb45e4/19c9aeec7ce005972...	0.0 ms	3.0 KiB
script.crazyegg.com/pages/scripts/0091/9541.js	300.0 s	2.7 KiB
app.termly.io/resource-blocker/support/808-26e9c6c7a3bd048ed656.min.js	14400.0 s	3.2 KiB
app.termly.io/resource-blocker/support/524-7d36cb122791702e3df2.min.js	14400.0 s	2.7 KiB
munchkin.marketo.net/munchkin.js	0.0 ms	1.2 KiB
/st?ga_tracking_id=G-CMGRJVENZ2%3BG-DQFNGEDDVS&ga_client_...	0.0 ms	1.2 KiB
/st?ga_tracking_id=G-CMGRJVENZ2%3BG-DQFNGEDDVS&ga_client_...	0.0 ms	1.1 KiB
js.adsrvr.org/universal_pixel.js	0.0 ms	958 B
gradadmissions.du.edu/ping	1786.0 s	967 B
admission.du.edu/ping	1786.0 s	965 B
/collect?v=2&fmt=js&pid=1731722%2C4027436%2C6138106&time=...	0.0 ms	693 B
app.termly.io/resource-blocker/support/377-e518d8a5c599aa1c5977.min.js	14400.0 s	873 B
/collect?v=2&fmt=js&pid=1731722%2C4027436%2C6138106&time=...	0.0 ms	567 B
/st?ga_tracking_id=G-CMGRJVENZ2%3BG-DQFNGEDDVS&ga_client_...	0.0 ms	469 B
/st?ga_tracking_id=G-CMGRJVENZ2%3BG-DQFNGEDDVS&ga_client_...	0.0 ms	467 B
js.adsrvr.org/universal_pixel.js	0.0 ms	465 B
/pixel/?ad_log=referer&action=lead&pixid=43958d36-4f9f-45...	0.0 ms	131 B
/tr/?id=587955852232025&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	19 B
/p.css?s=1&k=tir4vjc&ht=tk&f=39510.39511.39512.39513.3951...	604800.0 s	172 B
/tr/?id=846899537469881&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
/tr/?id=393220310237778&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
/tr/?id=424272042164780&ev=PageView&dl=https%3A%2F%2Fwww....	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
www.du.edu/themes/custom/pl_drupal/dest/fonts/fontello-icons/fontello.woff2	20 ms
use.typekit.net/af/deedd5/00000000000000007735bb07/31/l?subset_id=2&fvd=n6&v=3	15 ms
/af/404934/00000000000000007735bb2a/31/l?primer=7cdcb44be...	15 ms
/af/98fb6b/00000000000000007735bb14/31/l?primer=7cdcb44be...	10 ms
use.typekit.net/af/2a851a/00000000000000007735bb24/31/l?subset_id=2&fvd=n5&v=3	5.0 ms
use.typekit.net/af/53408e/00000000000000007735bb1e/31/l?subset_id=2&fvd=n3&v=3	5.0 ms
use.typekit.net/af/3adf0f/00000000000000007735bb0e/31/l?subset_id=2&fvd=n9&v=3	5.0 ms
use.typekit.net/af/4a8091/00000000000000007735bb02/31/l?subset_id=2&fvd=n8&v=3	5.0 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.

	URL	Resource Size	Est Savings
Students walking and laughing on Pearl Street `div.slick-slide > div.paragraph > div.slide-media > img`	/sites/default/files/styles/experiential_slide_xlarge/pub...	235.9 KiB	72.7 KiB
two students look at a laptop at senior design symposium `div.cards-module__content > div.card-img-wrapper > div > img`	/sites/default/files/du-Ritchie-SeniorDesignSymposium-202...	56.7 KiB	43.7 KiB
DU hockey team celebrating Frozen 4 `header.header > div.hero-media > picture > img`	/sites/default/files/styles/hero_image_1356_x_538/public/...	84.2 KiB	42.6 KiB
a group of students discuss and study `div.cards-module__content > div.card-img-wrapper > div > img`	www.du.edu/sites/default/files/Migrahack-00174_800x533.jpg	52.1 KiB	40.3 KiB
women soccer team cheering `div.slick-slide > div.paragraph > div.slide-media > img`	/sites/default/files/styles/experiential_slide_xlarge/pub...	90.9 KiB	28.1 KiB
two students in Korbel classroom `div.cards-module__content > div.card-img-wrapper > div > img`	www.du.edu/sites/default/files/du-korbel-classroom-2025-091.jpg	31.3 KiB	24.2 KiB
three students drink coffee in Denver downtown `div.du-tabs > div.du-tabs__panels > section#panel-life-in-denver > img`	www.du.edu/sites/default/files/du-ftd-denver-marketplace-2022-7445_995x560.jpg	74.0 KiB	20.8 KiB
a student at velotta lab `div.slick-slide > div.paragraph > div.slide-media > img`	/sites/default/files/styles/experiential_slide_xlarge/pub...	114.9 KiB	18.4 KiB
three 4D mentors greet people on move in day `article#main-content > div.row > div.columns > img`	/sites/default/files/styles/homepage_swapping_image_featu...	42.7 KiB	10.1 KiB
a student rock climbing and another person supporting `article#main-content > div.row > div.columns > img`	/sites/default/files/styles/homepage_swapping_image_featu...	36.4 KiB	8.6 KiB
a student presents to two people at a fair `article#main-content > div.row > div.columns > img`	/sites/default/files/styles/homepage_swapping_image_featu...	31.1 KiB	7.4 KiB

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 311 ms

URL	Time Spent
du.edu/	311 ms
www.du.edu/	0.0 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

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: 120 ms 190.1 KiB

URL	Transfer Size	Est Savings
/sites/default/files/css/css_qY9eAhzcCUdbqhvSNuVzoM9lSINf...	180.0 KiB	166.9 KiB
.flockler-carousel_v2-items{background:var(--fl-background,transparent);box-sizing:border-box; … } …	23.2 KiB	23.1 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
Script Evaluation	1.1 s
Other	414 ms
Style & Layout	252 ms
Script Parsing & Compilation	185 ms
Parse HTML & CSS	41 ms
Rendering	34 ms
Garbage Collection	32 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 13.3 KiB

URL	Transfer Size	Est Savings
www.du.edu/themes/custom/pl_drupal/js/app.js?v=1.1.0	28.7 KiB	13.3 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: 0.0 ms 761.5 KiB

URL	Transfer Size	Est Savings
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	105.3 KiB	81.6 KiB
/gtag/destination?id=G-CMGRJVENZ2%3BG-DQFNGEDDVS&cx=c&gtm...	136.6 KiB	72.5 KiB
www.googletagmanager.com/gtag/destination?id=AW-693795717&cx=c&gtm=4e64k0	133.9 KiB	68.9 KiB
www.googletagmanager.com/gtag/js?id=G-CMGRJVENZ2&cx=c&gtm=4e64k0	172.9 KiB	66.6 KiB
www.googletagmanager.com/gtag/destination?id=AW-16851547752&cx=c&gtm=4e64k0	137.4 KiB	65.6 KiB
www.googletagmanager.com/gtag/js?id=AW-16737007750&cx=c&gtm=4e64k0	143.4 KiB	64.8 KiB
www.googletagmanager.com/gtag/js?id=AW-944397613	138.9 KiB	63.5 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js	109.0 KiB	56.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-PC9LRS	184.8 KiB	55.7 KiB
app.termly.io/resource-blocker/7ba1b5fc-00c7-40fb-b9cb-ebbd46725653?autoBlock=on	143.2 KiB	53.1 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	30.5 KiB
www.du.edu/libraries/foundation-sites/dist/js/foundation.min.js?v=1.1.0	50.8 KiB	29.7 KiB
plugins.flockler.com/embed/v3/embed-carousel_v2.js	62.2 KiB	29.5 KiB
/pages/versioned/common-scripts/4ce8c7df8d425cc5046457682...	55.1 KiB	23.2 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.du.edu/sites/default/files/DUHockeyHomeHero.mp4	20.8 MiB
www.du.edu/sites/default/files/DUHockeyHomeHero.mp4	16.8 MiB
/sites/default/files/styles/experiential_slide_xlarge/pub...	236.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-PC9LRS	185.1 KiB
/sites/default/files/css/css_qY9eAhzcCUdbqhvSNuVzoM9lSINf...	180.2 KiB
www.googletagmanager.com/gtag/js?id=G-CMGRJVENZ2&cx=c&gtm=4e64k0	173.0 KiB
www.du.edu/sites/default/files/du-study-abroad_995x560.jpg	154.2 KiB
www.googletagmanager.com/gtag/js?id=AW-16737007750&cx=c&gtm=4e64k0	143.5 KiB
app.termly.io/resource-blocker/7ba1b5fc-00c7-40fb-b9cb-ebbd46725653?autoBlock=on	143.4 KiB
www.googletagmanager.com/gtag/js?id=AW-944397613	139.0 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
three students drink coffee in Denver downtown `div.du-tabs > div.du-tabs__panels > section#panel-life-in-denver > img`	www.du.edu/sites/default/files/du-ftd-denver-marketplace-2022-7445_995x560.jpg
a student presents to two people at a fair `article#main-content > div.row > div.columns > img`	/sites/default/files/styles/homepage_swapping_image_featu...
three 4D mentors greet people on move in day `article#main-content > div.row > div.columns > img`	/sites/default/files/styles/homepage_swapping_image_featu...
a student rock climbing and another person supporting `article#main-content > div.row > div.columns > img`	/sites/default/files/styles/homepage_swapping_image_featu...
Current Students `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/info-for-current-students-button.jpg
Alumni `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/info-for-alumni-button.jpg
Families `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/info-for-families-button.jpg
Neighbors `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/info-for-neighboors-button.jpg
Faculty `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/info-for-faculty-button.jpg
Staff `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/info-for-staff-button.jpg
Individuals talking in a hallway `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/Businesses-ResourcesFor.jpg
table settings for banquet `div.row > div.columns > a.bg-img-btn > img`	www.du.edu/sites/default/files/du-event-portal-audience-nav.jpg

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

●Max Potential First Input Delay 90 ms

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 10 user timings

●JavaScript execution time 0.6 s

●Avoid long main-thread tasks 5 long tasks found

●Avoid non-composited animations 34 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 180 ms

●Server Backend Latencies 160 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

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

●Avoid large layout shifts 4 layout shifts found

○INP breakdown

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

When a `progressbar` element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to label `progressbar` elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#off-canvas-content > article#main-content > div.experiential-wrapper > div.progress `div#off-canvas-content > article#main-content > div.experiential-wrapper > div.progress`
div#off-canvas-content > article#main-content > div.experiential-wrapper > div.progress `div#off-canvas-content > article#main-content > div.experiential-wrapper > div.progress`
div#off-canvas-content > article#main-content > div.experiential-wrapper > div.progress `div#off-canvas-content > article#main-content > div.experiential-wrapper > div.progress`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

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
UNDERGRADUATE PROGRAMS `div.columns > div > div.cards-module__content > h4`

These are opportunities to improve keyboard navigation in your application.

Names and labels

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
body.du-home > img `body.du-home > img`

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.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
DIRECTORY REQUEST INFO GIVE VISIT APPLY REPORT AN INCIDENT RESOURCES FOR `header.header > div#utility-menu > nav#block-utilitymenu > ul.menu`

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
DIRECTORY `nav#block-utilitymenu > ul.menu > div.menu-toggle-utility > li`
REQUEST INFO `nav#block-utilitymenu > ul.menu > div.menu-toggle-utility > li`
GIVE `nav#block-utilitymenu > ul.menu > div.menu-toggle-utility > li`
VISIT `nav#block-utilitymenu > ul.menu > div.menu-toggle-utility > li`
APPLY `nav#block-utilitymenu > ul.menu > div.menu-toggle-utility > li`
REPORT AN INCIDENT `nav#block-utilitymenu > ul.menu > div.menu-toggle-utility > li`

These are opportunities to improve the experience of reading tabular or list data using 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

●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

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●`[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

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

●`[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

●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

●`<video>` elements contain a `<track>` element with `[kind="captions"]`

●All heading elements contain content.

●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.

○`[accesskey]` values are unique

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○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

○Tables have different content in the summary attribute and `<caption>`.

○Uses ARIA roles only on compatible elements

○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	snap.licdn.com/li.lms-analytics/insight.min.js

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
www.du.edu/core/assets/vendor/jquery/jquery.min.js?v=3.6.3 line 1, col 31974	`TypeError: Cannot read properties of undefined (reading 'clear') at HTMLDocument.<anonymous> (https://www.du.edu/themes/custom/pl_drupal/js/app.js?v=1.1.0:2271:38) at e (https://www.du.edu/core/assets/vendor/jquery/jquery.min.js?v=3.6.3:2:30310) at t (https://www.du.edu/core/assets/vendor/jquery/jquery.min.js?v=3.6.3:2:30612)`

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Crawling and Indexing

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

To appear in search results, crawlers need access to your app.

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
body.du-home > img `body.du-home > 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

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`