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Lighthouse Desktop

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

Audit breakdown by category with detailed findings.

62

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
indianapolis.iu.edu/images/homepage/home-hero_2400x1200_alt-374k.webp0.0 ms365.6 KiB
indianapolis.iu.edu/images/homepage/skyline-background-with-trident-216k.webp0.0 ms216.5 KiB
indianapolis.iu.edu/images/homepage/skyline-background-light-220k.webp0.0 ms215.7 KiB
indianapolis.iu.edu/images/homepage/skyline-indianapolis-light-215k.webp0.0 ms214.5 KiB
indianapolis.iu.edu/images/homepage/iu-indianapolis-regatta-rowing.webp0.0 ms127.8 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
indianapolis.iu.edu/images/homepage/iu-indianapolis-medical-student.webp0.0 ms70.4 KiB
indianapolis.iu.edu/images/homepage/iu-indianapolis-students-laughing.webp0.0 ms70.1 KiB
indianapolis.iu.edu/images/homepage/iu-indianapolis-student-vr.webp0.0 ms68.8 KiB
indianapolis.iu.edu/images/homepage/iu-trident-downtown-indianapolis.webp0.0 ms63.7 KiB
fonts.iu.edu/fonts/benton-sans-bold.woff0.0 ms41.6 KiB
/images/homepage/iu-indianapolis-students-studying-smilin...0.0 ms41.4 KiB
fonts.iu.edu/fonts/benton-sans-medium.woff0.0 ms41.3 KiB
fonts.iu.edu/fonts/benton-sans-regular.woff0.0 ms41.0 KiB
indianapolis.iu.edu/images/homepage/student-smiling-iu-indianapolis-library.webp0.0 ms40.2 KiB
/signals/config/521554415416662?v=2.9.303&r=stable&domain...1200.0 s44.8 KiB
fonts.iu.edu/fonts/benton-sans-cond-black.woff0.0 ms39.0 KiB
siteimproveanalytics.com/js/siteanalyze_11378.js86400.0 s92.9 KiB
fonts.iu.edu/fonts/georgia-pro-regular.woff0.0 ms35.0 KiB
fonts.iu.edu/fonts/georgia-pro-bold.woff0.0 ms34.6 KiB
indianapolis.iu.edu/images/homepage/iu-indianapolis-students-outside.webp0.0 ms31.2 KiB
/live/resource/js/\livewhale\thirdparty\jquery\jquery.no-...10800.0 s35.8 KiB
indianapolis.iu.edu/css/site.css?26130404060.0 ms13.0 KiB
js.adsrvr.org/up_loader.1.1.0.js0.0 ms12.3 KiB
indianapolis.iu.edu/images/homepage/skyline-iu-trident-8k.webp0.0 ms8.0 KiB
collector-45540.tvsquared.com/tv2track.js600.0 s8.7 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
s.yimg.com/wi/ytc.js0.0 ms7.1 KiB
indianapolis.iu.edu/js/home-20240815-2.js0.0 ms5.4 KiB
indianapolis.iu.edu/js/site.js?26020324230.0 ms2.4 KiB
js.adsrvr.org/universal_pixel.js0.0 ms958 B
/live/resource/css/\livewhale\theme\global\styles\widgets...10800.0 s1.3 KiB
process.indiana.edu/ping1785.0 s967 B
/collect?v=2&fmt=js&pid=7515041&time=1776900186752&url=ht...0.0 ms693 B
exdd-resources.webapps.iu.edu/js/rave/rave.js0.0 ms653 B
/config/edu/00b282dd-5eb1-4507-bd1e-81a362988c47.js?v=3.5...0.0 ms465 B
/tv2track.php?action_name=IU%20Indianapolis%20-%20Your%20...0.0 ms276 B
news.iu.edu/livewhale/theme/core/scripts/lwcw.js604800.0 s2.7 KiB
/config/edu/34ad7e6d-5b07-44a5-9916-024f47e2c48f.js?v=3.5...0.0 ms262 B
/config/edu/1e5d1155-4d00-4c7b-8d75-61aa162aa8a6.js?v=3.5...0.0 ms252 B
/tr/?id=521554415416662&ev=PageView&dl=https%3A%2F%2Findi...0.0 ms18 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.222581] map[node:map[boundingRect:map[bottom:2739 height:1698 left:105 right:1245 top:1041 width:1140] lhId:page-13-DIV nodeLabel:STEP INTO INDIANA'S RESEARCH FRONTIER IU Indianapolis is the hub for a new era… path:1,HTML,1,BODY,5,MAIN,5,DIV selector:body.rvt-layout > main#main-content > div.rvt-c-statement-home snippet:<div class="rvt-c-statement-home rvt-p-top-xxl rvt-c-p-top-96-md-up rvt-c-bg-dark rvt-…"> type:node] score:0.216198 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:5055 height:336 left:105 right:643 top:4719 width:538] lhId:page-8-IMG nodeLabel:link hub image path:1,HTML,1,BODY,5,MAIN,9,DIV,0,DIV,2,DIV,0,DIV,0,IMG selector:div.rvt-p-tb-xxl > div.rvt-flex-md-up > div.rvt-c-full-width > img snippet:<img alt="link hub image" loading="lazy" src="images/homepage/student-smiling-iu-indianapolis-library.webp"> type:node]]] type:subitems]] map[score:0.006383 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:4010 height:570 left:105 right:1245 top:3440 width:1140] lhId:page-6-IMG nodeLabel:A female student in a lab coat with “IU School of Medicine” logo, wearing blue … path:1,HTML,1,BODY,5,MAIN,8,DIV,0,DIV,0,IMG selector:main#main-content > div.rvt-c-container-xxl > div.rvt-c-animate--image-fade-in-start > img snippet:<img alt="A female student in a lab coat with “IU School of Medicine” logo, wearing …" src="images/homepage/iu-indianapolis-medical-student.webp"> type:node]] map[cause:Web font extra:map[type:url value:https://fonts.iu.edu/fonts/benton-sans-regular.woff]] map[cause:Web font extra:map[type:url value:https://fonts.iu.edu/fonts/benton-sans-medium.woff]] map[cause:Web font extra:map[type:url value:https://fonts.iu.edu/fonts/benton-sans-cond-black.woff]] map[cause:Web font extra:map[type:url value:https://fonts.iu.edu/fonts/benton-sans-bold.woff]] map[cause:Web font extra:map[type:url value:https://fonts.iu.edu/fonts/georgia-pro-regular.woff]] map[cause:Web font extra:map[type:url value:https://fonts.iu.edu/fonts/georgia-pro-bold.woff]]] type:subitems]]]

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
A group of students walk confidently through the IU Indianapolis Campus Center … div.rvt-m-top-xxl > div > div.simpleParallax > img.rvt-c-full-width
indianapolis.iu.edu/images/homepage/home-hero_2400x1200_alt-374k.webp365.3 KiB282.9 KiB
A vibrant cityscape at dusk featuring the Soldiers and Sailors Monument in Indi… main#main-content > div.rvt-c-statement-home > div.rvt-c-layered-parallax__skyline-background > img.rvt-c-full-width
indianapolis.iu.edu/images/homepage/skyline-background-with-trident-216k.webp216.3 KiB106.5 KiB
The sky is a gradient of pink and purple hues. main#main-content > div.rvt-c-statement-home > div.rvt-c-layered-parallax__skyline-background > img.rvt-c-full-width
indianapolis.iu.edu/images/homepage/skyline-background-light-220k.webp215.4 KiB106.1 KiB
The sky is a gradient of pink and purple hues. main#main-content > div.rvt-c-statement-home > div.rvt-c-layered-parallax__skyline > img.rvt-c-full-width
indianapolis.iu.edu/images/homepage/skyline-indianapolis-light-215k.webp214.2 KiB105.5 KiB
Two students paddling a canoe during the Regatta, wearing life vests, with the … div.rvt-border-bottom > div.rvt-billboard > div.rvt-billboard__image > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-regatta-rowing.webp127.6 KiB68.1 KiB
A male student wearing a VR headset and an “Indianapolis IU” sweatshirt interac… div.rvt-c-container-xxl > div.rvt-flex > div.rvt-m-left-sm > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-student-vr.webp68.6 KiB46.4 KiB
A female student in a lab coat with “IU School of Medicine” logo, wearing blue … main#main-content > div.rvt-c-container-xxl > div.rvt-c-animate--image-fade-in-start > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-medical-student.webp70.1 KiB34.5 KiB
Two students walking outside on a brick pathway, smiling and engaged in convers… div.rvt-border-bottom > div.rvt-billboard > div.rvt-billboard__image > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-students-laughing.webp69.8 KiB26.1 KiB
link hub image div.rvt-p-tb-xxl > div.rvt-flex-md-up > div.rvt-c-full-width > img
indianapolis.iu.edu/images/homepage/student-smiling-iu-indianapolis-library.webp39.9 KiB21.9 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
indianapolis.iu.edu/http/1.1
indianapolis.iu.edu/css/site.css?2613040406http/1.1
indianapolis.iu.edu/images/homepage/skyline-background-with-trident-216k.webphttp/1.1
indianapolis.iu.edu/images/homepage/iu-indianapolis-medical-student.webphttp/1.1
indianapolis.iu.edu/images/homepage/iu-trident-downtown-indianapolis.webphttp/1.1
indianapolis.iu.edu/js/site.js?2602032423http/1.1
indianapolis.iu.edu/js/home-20240815-2.jshttp/1.1
/images/homepage/iu-indianapolis-students-studying-smilin...http/1.1
indianapolis.iu.edu/images/homepage/iu-indianapolis-students-outside.webphttp/1.1
indianapolis.iu.edu/images/homepage/iu-indianapolis-student-vr.webphttp/1.1
indianapolis.iu.edu/images/homepage/student-smiling-iu-indianapolis-library.webphttp/1.1
indianapolis.iu.edu/images/homepage/iu-indianapolis-students-laughing.webphttp/1.1
indianapolis.iu.edu/images/homepage/iu-indianapolis-regatta-rowing.webphttp/1.1
indianapolis.iu.edu/images/homepage/home-hero_2400x1200_alt-374k.webphttp/1.1
indianapolis.iu.edu/images/homepage/skyline-iu-trident-8k.webphttp/1.1
indianapolis.iu.edu/images/homepage/skyline-indianapolis-light-215k.webphttp/1.1
indianapolis.iu.edu/images/homepage/skyline-background-light-220k.webphttp/1.1
indianapolis.iu.edu/favicon.icohttp/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
indianapolis.iu.edu/css/site.css?261304040613.0 KiB152 ms
unpkg.com/rivet-core@2.6.0/css/rivet.min.css24.5 KiB342 ms
unpkg.com/rivet-icons@2.0.0/dist/rivet-icons.css617 B241 ms
unpkg.com/rivet-core@2.6.0/tokens/css/variables.css1.8 KiB241 ms
unpkg.com/rivet-stickers@0.3.0/dist/rivet-sticker-element.css1.0 KiB241 ms
/css2?family=Azeret+Mono:ital,wght@0,100..900;1,100..900&...915 B209 ms

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: 506 ms
URLTime Spent
iupui.edu/506 ms
indianapolis.iu.edu/0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
STEP INTO INDIANA'S RESEARCH FRONTIER IU Indianapolis is the hub for a new era… body.rvt-layout > main#main-content > div.rvt-c-statement-home
0.216
0.006

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: 30 ms 32.3 KiB
URLTransfer SizeEst Savings
unpkg.com/rivet-core@2.6.0/css/rivet.min.css24.1 KiB21.6 KiB
indianapolis.iu.edu/css/site.css?261304040612.7 KiB10.8 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: 30 ms 621.2 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-NFLPFVV&gtm=4e64k1157.7 KiB77.0 KiB
siteimproveanalytics.com/js/siteanalyze_11378.js92.2 KiB70.8 KiB
www.googletagmanager.com/gtag/destination?id=AW-11294882779&cx=c&gtm=4e64k1145.5 KiB69.0 KiB
www.googletagmanager.com/gtag/js?id=G-61CH0D2DQW&cx=c&gtm=4e64k1173.8 KiB65.3 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js121.0 KiB63.3 KiB
www.googletagmanager.com/gtag/destination?id=DC-10777741&cx=c&gtm=4e64k1129.5 KiB63.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-WJFT899123.0 KiB62.8 KiB
www.googletagmanager.com/gtag/destination?id=DC-10346257&cx=c&gtm=4e64k1129.2 KiB62.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-KPRMDMJJ&gtm=4e64k1170.4 KiB54.0 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB34.0 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.

URLTotal CPU TimeScript EvaluationScript Parse
Unattributable304 ms7.6 ms0.0 ms
indianapolis.iu.edu/279 ms20 ms1.9 ms
indianapolis.iu.edu/js/home-20240815-2.js278 ms70 ms0.8 ms
www.googletagmanager.com/gtm.js?id=GTM-WJFT899220 ms199 ms14 ms
www.googletagmanager.com/gtag/js?id=G-61CH0D2DQW&cx=c&gtm=4e64k1134 ms110 ms22 ms
www.googletagmanager.com/gtm.js?id=GTM-NFLPFVV&gtm=4e64k1130 ms106 ms22 ms
www.googletagmanager.com/gtag/destination?id=AW-11294882779&cx=c&gtm=4e64k1126 ms100 ms26 ms
www.googletagmanager.com/gtm.js?id=GTM-KPRMDMJJ&gtm=4e64k1117 ms86 ms27 ms
www.googletagmanager.com/gtag/destination?id=DC-10346257&cx=c&gtm=4e64k1112 ms76 ms36 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js112 ms90 ms20 ms
www.googletagmanager.com/gtag/destination?id=DC-10777741&cx=c&gtm=4e64k177 ms62 ms14 ms
sc-static.net/scevent.min.js73 ms66 ms2.5 ms
/signals/config/521554415416662?v=2.9.303&r=stable&domain...63 ms53 ms9.7 ms
connect.facebook.net/en_US/fbevents.js56 ms43 ms12 ms
siteimproveanalytics.com/js/siteanalyze_11378.js51 ms34 ms16 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation1.3 s
Other475 ms
Script Parsing & Compilation252 ms
Style & Layout227 ms
Parse HTML & CSS50 ms
Rendering48 ms
Garbage Collection41 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
indianapolis.iu.edu/images/homepage/home-hero_2400x1200_alt-374k.webp365.6 KiB
indianapolis.iu.edu/images/homepage/skyline-background-with-trident-216k.webp216.5 KiB
indianapolis.iu.edu/images/homepage/skyline-background-light-220k.webp215.7 KiB
indianapolis.iu.edu/images/homepage/skyline-indianapolis-light-215k.webp214.5 KiB
www.googletagmanager.com/gtag/js?id=G-61CH0D2DQW&cx=c&gtm=4e64k1173.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-KPRMDMJJ&gtm=4e64k1170.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-NFLPFVV&gtm=4e64k1157.7 KiB
www.googletagmanager.com/gtag/destination?id=AW-11294882779&cx=c&gtm=4e64k1145.5 KiB
www.googletagmanager.com/gtag/destination?id=DC-10777741&cx=c&gtm=4e64k1129.5 KiB
www.googletagmanager.com/gtag/destination?id=DC-10346257&cx=c&gtm=4e64k1129.2 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
A group of students walk confidently through the IU Indianapolis Campus Center … div.rvt-m-top-xxl > div > div.simpleParallax > img.rvt-c-full-width
indianapolis.iu.edu/images/homepage/home-hero_2400x1200_alt-374k.webp
The sky is a gradient of pink and purple hues. main#main-content > div.rvt-c-statement-home > div.rvt-c-layered-parallax__skyline > img.rvt-c-full-width
indianapolis.iu.edu/images/homepage/skyline-indianapolis-light-215k.webp
The sky is a gradient of pink and purple hues. main#main-content > div.rvt-c-statement-home > div.rvt-c-layered-parallax__skyline-background > img.rvt-c-full-width
indianapolis.iu.edu/images/homepage/skyline-background-light-220k.webp
A female student in a lab coat with “IU School of Medicine” logo, wearing blue … main#main-content > div.rvt-c-container-xxl > div.rvt-c-animate--image-fade-in-start > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-medical-student.webp
Two students walking outside on a brick pathway, smiling and engaged in convers… div.rvt-border-bottom > div.rvt-billboard > div.rvt-billboard__image > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-students-laughing.webp
Two students paddling a canoe during the Regatta, wearing life vests, with the … div.rvt-border-bottom > div.rvt-billboard > div.rvt-billboard__image > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-regatta-rowing.webp
link hub image div.rvt-p-tb-xxl > div.rvt-flex-md-up > div.rvt-c-full-width > img
indianapolis.iu.edu/images/homepage/student-smiling-iu-indianapolis-library.webp
A view of the IU Campus Center tower featuring a prominent red Indiana Universi… div.rvt-cols-6-md > div.rvt-m-top-xxl > figure#image > img
indianapolis.iu.edu/images/homepage/iu-trident-downtown-indianapolis.webp
Three students working together on laptops at a table in a bright room with lar… div.rvt-c-container-xxl > div.rvt-flex > div.rvt-c-animate--image-fade-in-start > img
/images/homepage/iu-indianapolis-students-studying-smilin...
Two students, one wearing a red IU shirt, walk together in a courtyard outside … div.rvt-c-container-xxl > div.rvt-flex > div.rvt-m-left-sm > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-students-outside.webp
A male student wearing a VR headset and an “Indianapolis IU” sweatshirt interac… div.rvt-c-container-xxl > div.rvt-flex > div.rvt-m-left-sm > img
indianapolis.iu.edu/images/homepage/iu-indianapolis-student-vr.webp

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

●Max Potential First Input Delay 130 ms
●Optimize DOM size
●Font display
●Forced reflow
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 6 user timings
●Avoid long main-thread tasks 9 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 160 ms
●Server Backend Latencies 170 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 120 ms
○INP breakdown
○LCP request discovery
○Avoid non-composited animations
100

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.

○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
●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 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
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements 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
○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.
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
81

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
AttributionReporting
snap.licdn.com/li.lms-analytics/insight.min.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
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
100

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.

○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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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