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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.

37

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
www.chicago.gov/content/dam/city/homepage/images/land-acknowledgement-final.png0.0 ms382.4 KiB
www.chicago.gov/content/dam/city/homepage/HomepageBanners/2019/2019August.jpg0.0 ms165.5 KiB
/content/dam/city/depts/mayor/Office of New Americans/ico...0.0 ms142.2 KiB
/content/dam/city/depts/mayor/MayorBrandonJohnson/Mayor-B...0.0 ms81.7 KiB
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-solid-900.woff20.0 ms78.6 KiB
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-brands-400.woff20.0 ms75.8 KiB
i.ytimg.com/vi/8jAmu-ooQUA/sddefault.jpg300.0 s50.4 KiB
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/main.min.css0.0 ms45.9 KiB
/content/dam/city/depts/mayor/ProtectingChicago/Protectin...0.0 ms42.4 KiB
/content/dam/city/homepage/feature_images/2021/CAP-2022-B...0.0 ms35.3 KiB
www.chicago.gov/content/dam/city/homepage/feature_images/2018/CHI311website.jpg0.0 ms34.5 KiB
www.chicago.gov/content/dam/city/homepage/feature_images/2018/Retiree-Health.jpg0.0 ms27.8 KiB
www.chicago.gov/content/dam/city/cds/chicago.gov-logo.png0.0 ms23.7 KiB
www.chicago.gov/content/dam/city/homepage/feature_images/2024/CRTRP-WEB_263.png0.0 ms22.9 KiB
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/css/all.min.css0.0 ms19.4 KiB
www.google-analytics.com/analytics.js7200.0 s20.8 KiB
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-regular-400.woff20.0 ms14.2 KiB
/content/dam/city/homepage/feature_images/2020/publicsafe...0.0 ms12.5 KiB
i.ytimg.com/vi/rNLEekZ9XzY/mqdefault.jpg300.0 s13.1 KiB
i.ytimg.com/vi/-bV0D0R0tEA/mqdefault.jpg300.0 s12.6 KiB
/content/dam/city/homepage/feature_images/2019/seesomethi...0.0 ms11.0 KiB
i.ytimg.com/vi/Fd8lr-DJoWk/mqdefault.jpg300.0 s11.2 KiB
webapps1.chicago.gov/cdn/chiwds/0.9.1/js/uswds.min.js0.0 ms10.1 KiB
www.chicago.gov/content/dam/city/cds/elastic-search/search.js0.0 ms9.5 KiB
siteimproveanalytics.com/js/siteanalyze_6451.js86400.0 s19.0 KiB
/content/dam/city/homepage/feature_images/2021/senior-saf...0.0 ms7.0 KiB
www.chicago.gov/content/dam/city/depts/dhr/FeatureServicesIcons/Jobs-Icon.png0.0 ms5.5 KiB
/content/dam/city/depts/fin/FeaturedServicesIcons/payutil...0.0 ms4.5 KiB
www.chicago.gov/content/dam/city/sites/cannabis/cannabis-200x200-1.png0.0 ms4.2 KiB
www.chicago.gov/content/dam/city/depts/fin/FeaturedServicesIcons/paytickets.png0.0 ms4.2 KiB
www.chicago.gov/content/dam/city/cds/translate/translate.js0.0 ms4.0 KiB
www.chicago.gov/content/dam/city/cds/chicago-star.png0.0 ms3.3 KiB
/content/dam/city/depts/streets/FeaturedServicesIcons/Str...0.0 ms3.3 KiB
www.chicago.gov/content/dam/city/cds/css/cds.css?v10.0 ms2.7 KiB
www.chicago.gov/content/dam/city/cds/translate/translate.css0.0 ms2.6 KiB
/l5jGDiF5MFFGFnilcbBnf0jxXSqnuw-X_lZwO-HI0gjrf6NjBEYE7fOb...86400.0 s4.0 KiB
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/img/plus-alt.svg0.0 ms1.4 KiB
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/img/angle-arrow-down-primary.svg0.0 ms1.2 KiB
www.chicago.gov/content/dam/city/cds/elastic-search/search.css0.0 ms1.1 KiB
www.chicago.gov/content/dam/city/cds/safari-pinned-tab.svg0.0 ms967 B
www.chicago.gov/content/dam/city/cds/close.svg0.0 ms789 B
www.chicago.gov/content/dam/city/cds/icon-dot-gov.svg0.0 ms446 B
static.doubleclick.net/instream/ad_status.js900.0 s494 B
www.chicago.gov/content/dam/city/cds/icon-https.svg0.0 ms410 B
www.chicago.gov/content/dam/city/cds/css/coc-cds.css0.0 ms209 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.

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
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-brands-400.woff2125 ms
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-solid-900.woff2105 ms
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-regular-400.woff275 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff220 ms
fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMwr7I_FMl_E.woff215 ms
/s/bigshoulderstext/v28/55xxezRtP9G3CGPIf49hxc8P0eytUxBcm...15 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.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
City of Chicago div.col > div.container-fluid > div.row > div#cds-img-block-148586522-img
www.chicago.gov/content/dam/city/homepage/images/land-acknowledgement-final.png382.3 KiB355.5 KiB
Chicago is a welcoming City! div.row > div.pb-2 > div.card > img.card-img-top
/content/dam/city/depts/mayor/Office of New Americans/ico...142.2 KiB118.7 KiB
DIVERSE, INNOVATIVE, WORLD CLASS WELCOME TO CHICAGO body.page-homepage > div#homepage-banner
www.chicago.gov/content/dam/city/homepage/HomepageBanners/2019/2019August.jpg165.5 KiB87.4 KiB
Mayor Brandon Johnson div.row > div.pb-2 > div.card > img.card-img-top
/content/dam/city/depts/mayor/MayorBrandonJohnson/Mayor-B...81.7 KiB75.1 KiB
Protecting Chicago div.row > div.pb-2 > div.card > img.card-img-top
/content/dam/city/depts/mayor/ProtectingChicago/Protectin...42.4 KiB35.9 KiB
Chicago Climate Action Plan div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2021/CAP-2022-B...35.3 KiB32.9 KiB
Chicago 311 div.carousel-cell > div.card > a.stretched-link > img.card-img-top
www.chicago.gov/content/dam/city/homepage/feature_images/2018/CHI311website.jpg34.5 KiB32.1 KiB
Uncashed Healthcare Premium Refund Checks div.carousel-cell > div.card > a.stretched-link > img.card-img-top
www.chicago.gov/content/dam/city/homepage/feature_images/2018/Retiree-Health.jpg27.8 KiB25.5 KiB
Logo of the City of Chicago div#logo > em.cds-logo-text > a > img
www.chicago.gov/content/dam/city/cds/chicago.gov-logo.png23.7 KiB23.4 KiB
Chicago Recovery Plan div.carousel-cell > div.card > a.stretched-link > img.card-img-top
www.chicago.gov/content/dam/city/homepage/feature_images/2024/CRTRP-WEB_263.png22.9 KiB20.5 KiB
Public Building Commission's Construction Season Kickoff 4.22.26 div.col-12 > div#video-1 > div.col-4 > img.img-fluid
i.ytimg.com/vi/rNLEekZ9XzY/mqdefault.jpg13.0 KiB12.1 KiB
Chicago Transit Authority's Construction Season Kickoff 4.21.26 div.col-12 > div#video-3 > div.col-4 > img.img-fluid
i.ytimg.com/vi/-bV0D0R0tEA/mqdefault.jpg12.2 KiB11.2 KiB
Department of Streets & Sanitation's Construction Season Kickoff 4.22.26 div.col-12 > div#video-2 > div.col-4 > img.img-fluid
i.ytimg.com/vi/Fd8lr-DJoWk/mqdefault.jpg11.1 KiB10.2 KiB
Public Safety Reform div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2020/publicsafe...12.5 KiB10.1 KiB
Protect Your Every Day div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2019/seesomethi...11.0 KiB8.6 KiB
Senior Safety Ordinance div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2021/senior-saf...6.9 KiB5.3 KiB
Work for the City div.flickity-slider > div.carousel-cell > div.card > img.card-img-top
www.chicago.gov/content/dam/city/depts/dhr/FeatureServicesIcons/Jobs-Icon.png5.4 KiB4.5 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-2-DIV
nodeLabel: DIVERSE, INNOVATIVE, WORLD CLASS WELCOME TO CHICAGO
path: 1,HTML,1,BODY,12,DIV
selector: body.page-homepage > div#homepage-banner
snippet: <div id="homepage-banner" class="jumbotron jumbotron-bg-cover w-100 d-flex align-items-center ">

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
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/main.min.csshttp/1.1
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/css/all.min.csshttp/1.1
webapps1.chicago.gov/cdn/chiwds/0.9.1/js/uswds.min.jshttp/1.1
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/img/angle-arrow-down-primary.svghttp/1.1
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/img/plus-alt.svghttp/1.1
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-solid-900.woff2http/1.1
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-brands-400.woff2http/1.1
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-regular-400.woff2http/1.1
webapps1.chicago.gov/cdn/YouTubeAPI/UC_D8Pvo7pWx3H_rie9XB-tg.jsonhttp/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
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
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/main.min.css45.9 KiB2.2 s
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/css/all.min.css19.4 KiB1.2 s
fonts.googleapis.com/css?family=Lora:400,700,400i,700i1.7 KiB
fonts.googleapis.com/css?family=Roboto:100,300,500,700,100i,300i,500i,700i2.2 KiB785 ms
/css?family=Big+Shoulders+Text:100,200,300,400,500,600,70...1.1 KiB152 ms
www.chicago.gov/content/dam/city/cds/elastic-search/search.js9.5 KiB303 ms
www.chicago.gov/content/dam/city/cds/css/coc-cds.css209 B
www.chicago.gov/content/dam/city/cds/elastic-search/search.css1.1 KiB
cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js27.8 KiB1.7 s
www.chicago.gov/content/dam/city/cds/css/cds.css?v12.7 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: 1.6 s
URLTime Spent
chicago.gov/763 ms
www.chicago.gov/812 ms
www.chicago.gov/city/en.html0.0 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: 450 ms 58.0 KiB
URLTransfer SizeEst Savings
webapps1.chicago.gov/cdn/chiwds/0.9.1/css/main.min.css44.7 KiB40.0 KiB
webapps1.chicago.gov/cdn/FontAwesome-5.13.0/css/all.min.css18.2 KiB18.0 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: 1.4 s 285.4 KiB
URLTransfer SizeEst Savings
/_/translate_http/_/js/k=translate_http.tr.en_US.VRmZKspy...118.2 KiB92.5 KiB
www.googletagmanager.com/gtag/js?id=UA-2412440-18&cx=c&gtm=4e64k1124.7 KiB65.0 KiB
www.googletagmanager.com/gtag/js?id=G-S6KEDJQPEW156.9 KiB64.6 KiB
www.googletagmanager.com/gtag/js?id=G-M8487EJXRJ&cx=c&gtm=4e64k1145.7 KiB63.3 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
www.chicago.gov/city/en.html1.1 s13 ms8.0 ms
Unattributable492 ms12 ms0.0 ms
/_/translate_http/_/js/k=translate_http.tr.en_US.VRmZKspy...426 ms275 ms60 ms
www.googletagmanager.com/gtag/js?id=G-S6KEDJQPEW420 ms310 ms58 ms
www.googletagmanager.com/gtag/js?id=G-M8487EJXRJ&cx=c&gtm=4e64k1292 ms236 ms54 ms
cdnjs.cloudflare.com/ajax/libs/elasticsearch/16.7.1/elasticsearch.min.js287 ms213 ms72 ms
cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js238 ms162 ms11 ms
www.googletagmanager.com/gtag/js?id=UA-2412440-18&cx=c&gtm=4e64k1234 ms166 ms49 ms
cdnjs.cloudflare.com/ajax/libs/flickity/2.2.2/flickity.pkgd.min.js102 ms46 ms22 ms
siteimproveanalytics.com/js/siteanalyze_6451.js83 ms71 ms9.2 ms
www.google-analytics.com/analytics.js53 ms45 ms8.0 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 Evaluation1.6 s
Other829 ms
Style & Layout650 ms
Script Parsing & Compilation381 ms
Rendering237 ms
Parse HTML & CSS162 ms
Garbage Collection32 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 5.8 KiB
URLTransfer SizeEst Savings
www.chicago.gov/content/dam/city/cds/elastic-search/search.js9.5 KiB5.8 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.

URLTransfer Size
www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436.0 KiB
www.chicago.gov/content/dam/city/homepage/images/land-acknowledgement-final.png382.4 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021...183.1 KiB
www.chicago.gov/content/dam/city/homepage/HomepageBanners/2019/2019August.jpg165.5 KiB
www.googletagmanager.com/gtag/js?id=G-S6KEDJQPEW157.2 KiB
www.googletagmanager.com/gtag/js?id=G-M8487EJXRJ&cx=c&gtm=4e64k1145.7 KiB
/content/dam/city/depts/mayor/Office of New Americans/ico...142.2 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021...140.1 KiB
www.googletagmanager.com/gtag/js?id=UA-2412440-18&cx=c&gtm=4e64k1124.8 KiB
/_/translate_http/_/js/k=translate_http.tr.en_US.VRmZKspy...118.7 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
Chicago is a welcoming City! div.row > div.pb-2 > div.card > img.card-img-top
/content/dam/city/depts/mayor/Office of New Americans/ico...
Pay Utility Bill div.flickity-slider > div.carousel-cell > div.card > img.card-img-top
/content/dam/city/depts/fin/FeaturedServicesIcons/payutil...
Work for the City div.flickity-slider > div.carousel-cell > div.card > img.card-img-top
www.chicago.gov/content/dam/city/depts/dhr/FeatureServicesIcons/Jobs-Icon.png
Parking div.flickity-slider > div.carousel-cell > div.card > img.card-img-top
www.chicago.gov/content/dam/city/depts/fin/FeaturedServicesIcons/paytickets.png
Street Operations div.flickity-slider > div.carousel-cell > div.card > img.card-img-top
/content/dam/city/depts/streets/FeaturedServicesIcons/Str...
Logo of the City of Chicago div#logo > em.cds-logo-text > a > img
www.chicago.gov/content/dam/city/cds/chicago.gov-logo.png
Flag div.trust-seal-link > div.row > div.col > img.trust-seal-flag
www.chicago.gov/content/dam/city/cds/safari-pinned-tab.svg
Chicago Recovery Plan div.carousel-cell > div.card > a.stretched-link > img.card-img-top
www.chicago.gov/content/dam/city/homepage/feature_images/2024/CRTRP-WEB_263.png
Senior Safety Ordinance div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2021/senior-saf...
Public Building Commission&#39;s Construction Season Kickoff 4.22.26 div.col-12 > div#video-1 > div.col-4 > img.img-fluid
i.ytimg.com/vi/rNLEekZ9XzY/mqdefault.jpg
Department of Streets &amp; Sanitation&#39;s Construction Season Kickoff 4.22.26 div.col-12 > div#video-2 > div.col-4 > img.img-fluid
i.ytimg.com/vi/Fd8lr-DJoWk/mqdefault.jpg
Chicago Transit Authority&#39;s Construction Season Kickoff 4.21.26 div.col-12 > div#video-3 > div.col-4 > img.img-fluid
i.ytimg.com/vi/-bV0D0R0tEA/mqdefault.jpg
Mayor Brandon Johnson div.row > div.pb-2 > div.card > img.card-img-top
/content/dam/city/depts/mayor/MayorBrandonJohnson/Mayor-B...
Protecting Chicago div.row > div.pb-2 > div.card > img.card-img-top
/content/dam/city/depts/mayor/ProtectingChicago/Protectin...
Chicago 311 div.carousel-cell > div.card > a.stretched-link > img.card-img-top
www.chicago.gov/content/dam/city/homepage/feature_images/2018/CHI311website.jpg
Public Safety Reform div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2020/publicsafe...
Uncashed Healthcare Premium Refund Checks div.carousel-cell > div.card > a.stretched-link > img.card-img-top
www.chicago.gov/content/dam/city/homepage/feature_images/2018/Retiree-Health.jpg
Cannabis Information Center div.carousel-cell > div.card > a.stretched-link > img.card-img-top
www.chicago.gov/content/dam/city/sites/cannabis/cannabis-200x200-1.png
Protect Your Every Day div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2019/seesomethi...
Chicago Climate Action Plan div.carousel-cell > div.card > a.stretched-link > img.card-img-top
/content/dam/city/homepage/feature_images/2021/CAP-2022-B...
close nav.cds-nav > div.cds-nav-inner > button.cds-nav-close > img
www.chicago.gov/content/dam/city/cds/close.svg

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

●Layout shift culprits
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 12 user timings
●Avoid long main-thread tasks 14 long tasks found
●Avoid non-composited animations 1 animated element found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 20 ms
●Server Backend Latencies 60 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 40 ms
○INP breakdown
○Avoid large layout shifts
97

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
Work for the City div#cds-cardsSlider-53244564 > div.flickity-viewport > div.flickity-slider > div.carousel-cell
Parking Tickets div#cds-cardsSlider-53244564 > div.flickity-viewport > div.flickity-slider > div.carousel-cell
Street Operations div#cds-cardsSlider-53244564 > div.flickity-viewport > div.flickity-slider > div.carousel-cell
Chicago 311 div#cds-cardsSlider-625815377 > div.flickity-viewport > div.flickity-slider > div.carousel-cell
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Chicago Climate Action Plan div#cds-cardsSlider-625815377 > div.flickity-viewport > div.flickity-slider > div.carousel-cell
Chicago Recovery Plan div#cds-cardsSlider-625815377 > div.flickity-viewport > div.flickity-slider > div.carousel-cell

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>`
●`[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
●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
●`<frame>` or `<iframe>` elements have a title
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
○`[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 the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○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.
100

Best Practices

●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
○robots.txt is valid
○Document has a valid `rel=canonical`

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