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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

40

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:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:27.989 source:map[column:27323 line:3 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM 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:76.29 source:map[type:text value:[unattributed]]] map[reflowTime:5.947 source:map[column:84992 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:19.166 source:map[column:83946 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:4.685 source:map[column:92537 line:7 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:0.308 source:map[column:50335 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:0.263 source:map[column:50393 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:0.28 source:map[column:50457 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:0.08 source:map[column:49637 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:0.414 source:map[column:49615 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:0.408 source:map[column:51395 line:2 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM urlProvider:network]] map[reflowTime:0.969 source:map[column:101477 line:7 type:source-location url:https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM 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-DIV
nodeLabel: Sunlight reflecting over the Van Wickle Gates at Brown University
path: 1,HTML,1,BODY,3,DIV,0,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,1,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV
selector: article.js-component > div.js-background > div.fs-background-container > div.fs-background-media
snippet: <div class="fs-background-media fs-background-responsive fs-background-native" aria-hidden="true" style="background-image: url(&quot;/sites/default/files/styles/portrait_full_sml/publi…&quot;);">

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
/sites/default/files/css/css_8vgz6odbIwqY9EZIoh6i9uF5Womf...168.0 KiB1.8 s
www.brown.edu/themes/custom/brown/static/css/fonts.css501 B
/sites/default/files/css/css_uSQVbcOcHjGtJVOJGoVIXL7pEEsl...2.7 KiB
/sites/default/files/css/css_iDcWWw2TWbrGS61l8WyrHSJnxyn8...1.4 KiB
use.typekit.net/lok3dnd.css938 B757 ms
/p.css?s=1&k=lok3dnd&ht=tk&f=6812.6814.6817&a=8517581&app...172 B753 ms

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
extend.vimeocdn.com/ga/2806066.js86400.0 s5.8 KiB
/p.css?s=1&k=lok3dnd&ht=tk&f=6812.6814.6817&a=8517581&app...604800.0 s172 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.

URLEst Savings
/af/5033af/0000000000000000000151d3/27/l?primer=7cdcb44be...5.0 ms
/af/1286c7/0000000000000000000151d6/27/l?primer=7cdcb44be...5.0 ms
/af/ea8d85/0000000000000000000151d1/27/l?primer=7cdcb44be...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.

URLResource SizeEst Savings
Sunlight reflecting over the Van Wickle Gates at Brown University article.js-component > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/portrait_full_sml/public/2026...154.7 KiB87.9 KiB
div.js-background > div.fs-background-container > div.fs-background-media > img div.js-background > div.fs-background-container > div.fs-background-media > img
/sites/default/files/styles/wide_sml/public/2026-01/20251...123.8 KiB76.2 KiB
Students on Main Green at Brown University a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2025-04/F...98.3 KiB71.2 KiB
div.social_campaign_body > div.social_campaign_images > div.social_campaign_image_group > img.social_campaign_image div.social_campaign_body > div.social_campaign_images > div.social_campaign_image_group > img.social_campaign_image
/sites/default/files/styles/square_sml/public/2026-01/607...131.2 KiB65.4 KiB
Quiet Green a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-03/2...84.6 KiB57.5 KiB
Providence skyline a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-02/2...82.6 KiB55.5 KiB
Commencement procession a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-02/2...81.1 KiB54.0 KiB
Main Green a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/0...80.4 KiB53.3 KiB
Students on green a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/1...78.5 KiB51.4 KiB
div.wysiwyg_block_inner > div.typography > section.brown-loves-providence > img div.wysiwyg_block_inner > div.typography > section.brown-loves-providence > img
/sites/default/files/brownlovespvd/BrownLovesProv_VI_Tool...60.7 KiB50.3 KiB
Campus aerial a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/2...75.8 KiB48.7 KiB
Students working in lab a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-03/2...73.0 KiB45.9 KiB
Students on campus a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/h...70.4 KiB43.3 KiB
Students perform a hula on stage in Sayles Hall a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2026-04/H...68.5 KiB41.4 KiB
Campus Map a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/c...67.9 KiB40.8 KiB
Waterfire a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-03/2...65.2 KiB38.1 KiB
a telescope image of distant galaxies a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2026-04/x...63.0 KiB35.9 KiB
Professor and students engaged in discussion a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2022-03/0...62.6 KiB35.5 KiB
Athletic Field a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/0...60.8 KiB33.7 KiB
Students eat at a standing table with a mini-flag centerpiece a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2026-04/2...60.1 KiB33.0 KiB
Students working with faculty member a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/2...59.7 KiB32.6 KiB
Downtown Providence a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/2...58.0 KiB30.8 KiB
Christina Paxson, Paul McCartney and Morgan Neville in conversation at the VETS article.js-component > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_sml/public/2026-04/20...90.1 KiB30.8 KiB
portraits people placed side-by-side a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2026-04/O...56.5 KiB29.4 KiB
Conceptual rendering of the ground floor of a proposed building for economics a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2026-04/w...51.2 KiB24.1 KiB
Collage of a photo of Ieva Jusionyte and a photo of Matthew Kraft a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2026-04/G...51.1 KiB24.0 KiB
Christina Paxson, Paul McCartney and Morgan Neville in conversation at the VETS a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2026-04/2...49.6 KiB22.5 KiB
Graduate and Professional a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/0...47.7 KiB20.6 KiB
Schools and Colleges a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/0...47.1 KiB20.0 KiB
Students in class a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/2...41.4 KiB14.3 KiB
Academics a.component_figure_link > div.js-background > div.fs-background-container > div.fs-background-media
/sites/default/files/styles/classic_xsml/public/2019-04/0...39.2 KiB12.1 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: 1.1 s
URLTime Spent
brown.edu/1.1 s
www.brown.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

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

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: 830 ms 159.0 KiB
URLTransfer SizeEst Savings
/sites/default/files/css/css_8vgz6odbIwqY9EZIoh6i9uF5Womf...167.7 KiB159.0 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: 1.9 s 309.7 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-QY13L4Q0C0&cx=c&gtm=4e64k0h2173.2 KiB72.7 KiB
www.googletagmanager.com/gtag/js?id=G-PCH3TG4K4L&cx=c&gtm=4e64k0h2173.0 KiB72.5 KiB
www.googletagmanager.com/gtag/js?id=G-S0MX9K9C18&cx=c&gtm=4e64k0h2152.1 KiB64.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-KX5NV9173.9 KiB56.8 KiB
/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj...82.3 KiB43.4 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
/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj...1.7 s715 ms21 ms
www.brown.edu/1.0 s8.6 ms2.1 ms
Unattributable414 ms8.8 ms0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-KX5NV9397 ms339 ms48 ms
www.googletagmanager.com/gtag/js?id=G-PCH3TG4K4L&cx=c&gtm=4e64k0h2273 ms217 ms55 ms
www.googletagmanager.com/gtag/js?id=G-S0MX9K9C18&cx=c&gtm=4e64k0h2241 ms200 ms39 ms
www.googletagmanager.com/gtag/js?id=G-QY13L4Q0C0&cx=c&gtm=4e64k0h2234 ms188 ms44 ms
/sites/default/files/css/css_8vgz6odbIwqY9EZIoh6i9uF5Womf...60 ms0.0 ms0.0 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 Evaluation1.7 s
Style & Layout1.1 s
Other991 ms
Script Parsing & Compilation210 ms
Rendering187 ms
Parse HTML & CSS150 ms
Garbage Collection16 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
/sites/default/files/styles/square_med/public/2026-01/202...496.5 KiB
/sites/default/files/styles/square_med/public/2025-06/202...358.0 KiB
/sites/default/files/styles/square_med/public/2019-03/Peo...336.3 KiB
/sites/default/files/styles/square_sml/public/2026-01/202...305.0 KiB
/sites/default/files/styles/square_med/public/2026-01/202...295.2 KiB
/sites/default/files/styles/square_med/public/2026-01/220...256.9 KiB
/sites/default/files/styles/square_sml/public/2019-03/Peo...222.7 KiB
/sites/default/files/styles/square_sml/public/2025-06/202...219.0 KiB
/sites/default/files/styles/square_med/public/2019-04/201...178.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-KX5NV9174.2 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
div.social_campaign_body > div.social_campaign_images > div.social_campaign_image_group > img.social_campaign_image div.social_campaign_body > div.social_campaign_images > div.social_campaign_image_group > img.social_campaign_image
/sites/default/files/styles/square_sml/public/2026-01/607...

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

●Layout shift culprits
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 15 user timings
●Avoid long main-thread tasks 12 long tasks found
●Avoid non-composited animations 6 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 40 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 70 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
96

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

Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
Featured Most Recent div.fs-row > div.fs-cell > div.news_selector_inner > header.news_selector_header
Learn About Brown Academic Offerings Campus & Community Visit Brown div.fs-row > div.fs-cell > div.news_selector_inner > header.news_selector_header

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.

○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>`
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[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 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
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Deprecated ARIA roles were not used
○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
○`[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
○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
○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.
○No element has a `[tabindex]` value greater than 0
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
96

Best Practices

General

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.

SourceDescription
www.brown.edu/themes/custom/brown/static/site.webmanifest line 9, col 0
Manifest: Line: 10, column: 5, Unexpected token.
www.brown.edu/themes/custom/brown/static/site.webmanifest line 9, col 0
Manifest: Line: 10, column: 5, Unexpected token.
●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 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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