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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.

39

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
missouri.edu/sites/default/files/2025-09/why-choose-mizzou.jpg86400.0 s984.6 KiB
missouri.edu/sites/default/files/2025-10/Academics2_1920x1080.jpg86400.0 s902.4 KiB
/sites/default/files/2025-07/468fd4aec367a956c9caa6cac6fb...86400.0 s745.4 KiB
missouri.edu/sites/default/files/2025-09/alumni-day-in-life.jpg86400.0 s550.0 KiB
/themes/contrib/miz_d8_theme_base/fonts/open-sans/open-sa...86401.0 s517.8 KiB
missouri.edu/sites/default/files/2025-09/move-dorm.jpg86400.0 s507.5 KiB
missouri.edu/sites/default/files/2025-09/AnthemCoverPhoto-800x800.jpg86400.0 s473.9 KiB
/sites/default/files/styles/homepage_hero_mobile/public/2...86400.0 s96.5 KiB
i.ytimg.com/vi_webp/EomciOHYyHI/maxresdefault.webp7200.0 s44.9 KiB
i.ytimg.com/vi_webp/SQ-vZLiSn9A/maxresdefault.webp7200.0 s34.1 KiB
i.ytimg.com/vi_webp/Udpgp3r3Kkg/maxresdefault.webp7200.0 s33.1 KiB
i.ytimg.com/vi_webp/uRNbNs3dWSg/maxresdefault.webp7200.0 s31.1 KiB
/themes/contrib/miz_d8_theme_base/fonts/martina-plantijn/...86401.0 s47.5 KiB
missouri.edu/core/assets/vendor/jquery/jquery.min.js?v=4.0.086401.0 s31.6 KiB
missouri.edu/themes/contrib/miz_d8_theme_base/fonts/manuka/manuka-bold.woff286401.0 s31.3 KiB
i.ytimg.com/vi_webp/3wF6CqwVsbY/maxresdefault.webp7200.0 s15.3 KiB
scripts.clarity.ms/0.8.60-beta/clarity.js86400.0 s25.0 KiB
tags.srv.stackadapt.com/events.js5.0 s7.7 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
/modules/contrib/miz_components/assets/images/brand/patte...86401.0 s11.6 KiB
missouri.edu/themes/contrib/miz_d8_theme_base/css/miz-slim.css?tdnnrx86401.0 s5.6 KiB
/themes/miz_missouri_edu_subtheme/images/MU_MizzouSig_rgb...86401.0 s3.3 KiB
/sites/default/files/css/css_IImKC5GPwxKKMIFQt3qLykq6uhM6...1209600.0 s9.8 KiB
/sites/default/files/js/js_VBjOLSWhC8LQfHYLwsJASAw0EgreKO...1209600.0 s9.8 KiB
static.addtoany.com/menu/page.js86400.0 s2.2 KiB
/sites/default/files/js/js_ZD5FJfCj1LiFYKrY8Ypvhdelk3NP6Y...1209600.0 s4.7 KiB
/config/edu/ab685265-39ef-4d0c-a71f-d442210a5ffe.js?v=3.5...0.0 ms470 B
/collect?v=2&fmt=js&pid=1616578&time=1776805483058&li_ads...0.0 ms452 B
/sites/default/files/css/css_2NsOD_5xT2C7GLP-pI86mwqxc0Ne...1209600.0 s4.3 KiB
/themes/miz_missouri_edu_subtheme/components/components/m...86401.0 s985 B
missouri.edu/modules/contrib/google_tag/js/gtag.js?tdnnrx86401.0 s868 B
missouri.edu/modules/contrib/google_tag/js/gtm.js?tdnnrx86401.0 s792 B
/themes/miz_missouri_edu_subtheme/components/components/m...86401.0 s708 B
/sites/default/files/css/css_23HH5PycdBVZ8veS9iSKMl3WeVuv...1209600.0 s2.6 KiB
missouri.edu/themes/contrib/miz_d8_theme_base/css/miz-fonts.css?tdnnrx86401.0 s516 B
/sites/default/files/js/js_zSYMFT4_Lys5YyOcuWyE_GP3TPQc38...1209600.0 s1013 B
/sites/default/files/js/js_bsqrMTIj6Ie_9J46qUNYCRWV3HfMPT...1209600.0 s487 B
/sites/default/files/css/css_5cEmsVzJybnGCmsHLIKOY0CElTjb...1209600.0 s279 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:0.117136] map[node:map[boundingRect:map[bottom:1817 height:871 left:16 right:396 top:946 width:380] lhId:page-7-DIV nodeLabel:We Know You’ve Got What It Takes Ready to chase your curiosity? At the Univers… path:1,HTML,1,BODY,3,DIV,0,DIV,2,MAIN,0,DIV,1,ARTICLE,0,DIV,2,DIV,0,DIV,1,DIV,0,DIV,0,DIV selector:div.miz-layout__body > div.miz-layout__body-item > div > div.miz-card snippet:<div data-component-id="miz_components:card" class="miz-card miz-card--light miz-card--special"> type:node] score:0.117136]]

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
/themes/contrib/miz_d8_theme_base/fonts/open-sans/open-sa...30 ms
missouri.edu/themes/contrib/miz_d8_theme_base/fonts/manuka/manuka-bold.woff25.0 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
A Mizzou tour guide asking a female student Why did you choose Mizzou div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/why-choose-mizzou.jpg983.7 KiB950.6 KiB
A Mizzou student looking at various water samples and writing notes in a notebo… div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-10/Academics2_1920x1080.jpg901.7 KiB886.1 KiB
Springtime on the quad with students biking and walking article > div > div > img.miz-image
/sites/default/files/2025-07/468fd4aec367a956c9caa6cac6fb...744.7 KiB726.3 KiB
Laptop screen from a young Mizzou alumni working at the Super Bowl div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/alumni-day-in-life.jpg549.4 KiB516.3 KiB
Move in with freshman Sophia Askinosie div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/move-dorm.jpg506.9 KiB473.9 KiB
Student sitting at the base of the columns on the Mizzou Quad div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/AnthemCoverPhoto-800x800.jpg473.3 KiB452.7 KiB
Jesse Hall div > div > picture > img.miz-image
/sites/default/files/styles/homepage_hero_mobile/public/2...96.2 KiB68.8 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-6-IMG
nodeLabel: Jesse Hall
path: 1,HTML,1,BODY,3,DIV,0,DIV,2,MAIN,0,DIV,1,ARTICLE,0,DIV,1,DIV,0,DIV,0,DIV,0,SECTION,1,DIV,0,ARTICLE,0,DIV,1,DIV,0,PICTURE,3,IMG
selector: div > div > picture > img.miz-image
snippet: <img loading="lazy" width="375" src="/sites/default/files/styles/homepage_hero_mobile/public/2025-10/HomepageHe…" alt="Jesse Hall" class="miz-image">

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_23HH5PycdBVZ8veS9iSKMl3WeVuv...2.6 KiB
missouri.edu/themes/contrib/miz_d8_theme_base/css/miz-fonts.css?tdnnrx516 B
missouri.edu/themes/contrib/miz_d8_theme_base/css/miz-slim.css?tdnnrx5.6 KiB
missouri.edu/modules/contrib/google_tag/js/gtm.js?tdnnrx792 B
missouri.edu/modules/contrib/google_tag/js/gtag.js?tdnnrx868 B
/sites/default/files/css/css_IImKC5GPwxKKMIFQt3qLykq6uhM6...9.8 KiB302 ms
/sites/default/files/css/css_2NsOD_5xT2C7GLP-pI86mwqxc0Ne...4.3 KiB
/sites/default/files/js/js_bsqrMTIj6Ie_9J46qUNYCRWV3HfMPT...487 B

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.

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

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
We Know You’ve Got What It Takes Ready to chase your curiosity? At the Univers… div.miz-layout__body > div.miz-layout__body-item > div > div.miz-card
0.117

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 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: 2.3 s 284.4 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-1R84ZFX37M&cx=c&gtm=4e64h1176.4 KiB71.5 KiB
www.googletagmanager.com/gtag/js?id=G-X5WTGNM3XF&cx=c&gtm=4e64h1156.5 KiB65.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-5XMXM62J117.0 KiB64.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-PB763WT131.3 KiB61.6 KiB
static.addtoany.com/menu/modules/core.ydpp7jcu.js25.7 KiB21.0 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
missouri.edu/564 ms8.2 ms1.1 ms
Unattributable504 ms25 ms0.0 ms
www.googletagmanager.com/gtag/js?id=G-1R84ZFX37M&cx=c&gtm=4e64h1363 ms284 ms76 ms
www.googletagmanager.com/gtag/js?id=G-X5WTGNM3XF&cx=c&gtm=4e64h1341 ms274 ms64 ms
scripts.clarity.ms/0.8.60-beta/clarity.js274 ms227 ms8.9 ms
www.googletagmanager.com/gtm.js?id=GTM-PB763WT263 ms198 ms50 ms
www.googletagmanager.com/gtm.js?id=GTM-5XMXM62J145 ms103 ms41 ms
sc-static.net/scevent.min.js128 ms110 ms7.8 ms
tags.srv.stackadapt.com/events.js86 ms29 ms3.3 ms
snap.licdn.com/li.lms-analytics/insight.min.js81 ms67 ms7.2 ms
missouri.edu/core/assets/vendor/jquery/jquery.min.js?v=4.0.073 ms35 ms9.9 ms
/sites/default/files/js/js_ZD5FJfCj1LiFYKrY8Ypvhdelk3NP6Y...62 ms52 ms1.9 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.

CategoryTime Spent
Script Evaluation1.6 s
Other574 ms
Style & Layout402 ms
Script Parsing & Compilation280 ms
Parse HTML & CSS193 ms
Garbage Collection51 ms
Rendering50 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
missouri.edu/sites/default/files/2025-09/why-choose-mizzou.jpg984.6 KiB
missouri.edu/sites/default/files/2025-10/Academics2_1920x1080.jpg902.4 KiB
/sites/default/files/2025-07/468fd4aec367a956c9caa6cac6fb...745.4 KiB
missouri.edu/sites/default/files/2025-09/alumni-day-in-life.jpg550.0 KiB
/themes/contrib/miz_d8_theme_base/fonts/open-sans/open-sa...517.8 KiB
missouri.edu/sites/default/files/2025-09/move-dorm.jpg507.5 KiB
missouri.edu/sites/default/files/2025-09/AnthemCoverPhoto-800x800.jpg473.9 KiB
www.googletagmanager.com/gtag/js?id=G-1R84ZFX37M&cx=c&gtm=4e64h1176.4 KiB
www.googletagmanager.com/gtag/js?id=G-X5WTGNM3XF&cx=c&gtm=4e64h1156.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-PB763WT131.6 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
Springtime on the quad with students biking and walking article > div > div > img.miz-image
/sites/default/files/2025-07/468fd4aec367a956c9caa6cac6fb...
A Mizzou student looking at various water samples and writing notes in a notebo… div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-10/Academics2_1920x1080.jpg
A Mizzou tour guide asking a female student Why did you choose Mizzou div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/why-choose-mizzou.jpg
Move in with freshman Sophia Askinosie div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/move-dorm.jpg
Laptop screen from a young Mizzou alumni working at the Super Bowl div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/alumni-day-in-life.jpg
Student sitting at the base of the columns on the Mizzou Quad div > article > div > img.miz-image
missouri.edu/sites/default/files/2025-09/AnthemCoverPhoto-800x800.jpg
Mizzou Signature Logo footer.mizzou-footer > div.mizzou-footer-sig > a > img
/themes/miz_missouri_edu_subtheme/images/MU_MizzouSig_rgb...
Memorial Stadium at night div > article > div > img.miz-image
Mizzou students standing in front of a stock ticker div > article > div > img.miz-image

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

●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Reduce unused CSS
●User Timing marks and measures 11 user timings
●Avoid long main-thread tasks 11 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 120 ms
●Server Backend Latencies 160 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 0 ms
○INP breakdown
○Avoid non-composited animations
89

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.

Tables and lists

When definition lists are not properly marked up, screen readers may produce confusing or inaccurate output. Learn how to structure definition lists correctly.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Address City, State, Zip Code City Columbia State MO Zip Code 65211 Telephone n… div.miz-card > div.miz-card__body > div.miz-link-container > dl.miz-contact-point

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.mizzou-header-content > div.mizzou-header__masthead > p.miz-masthead__title > a.miz-masthead__title-link div.mizzou-header-content > div.mizzou-header__masthead > p.miz-masthead__title > a.miz-masthead__title-link
div.miz-social-media > ul.miz-social-media-list > li.miz-social-media-list__item > a.miz-social-media-list__link div.miz-social-media > ul.miz-social-media-list > li.miz-social-media-list__item > a.miz-social-media-list__link
div.miz-social-media > ul.miz-social-media-list > li.miz-social-media-list__item > a.miz-social-media-list__link div.miz-social-media > ul.miz-social-media-list > li.miz-social-media-list__item > a.miz-social-media-list__link
div.miz-social-media > ul.miz-social-media-list > li.miz-social-media-list__item > a.miz-social-media-list__link div.miz-social-media > ul.miz-social-media-list > li.miz-social-media-list__item > a.miz-social-media-list__link

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.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a
div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a div.miz-card__body > ul.miz-link-list > li.miz-link-list__item > a

These items highlight common accessibility best practices.

○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
●Definition list items are wrapped in `<dl>` elements
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[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
○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.
○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.
○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
92

SEO

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

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Page has successful HTTP status code
●Links 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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