Lighthouse Desktop

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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:0.132219] map[node:map[boundingRect:map[bottom:1268 height:343 left:0 right:1350 top:925 width:1350] lhId:page-7-DIV nodeLabel:PyData is an educational program of NumFOCUS, a 501(c)(3) nonprofit charity. B… path:1,HTML,1,BODY,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,2,DIV selector:div.entry-content > div.et-l > div.et_builder_inner_content > div.et_pb_section snippet:<div class="et_pb_section et_pb_section_2 et_pb_with_background et_section_regular"> type:node] score:0.096986 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:3199 height:57 left:990 right:1190 top:3142 width:200] lhId:page-16-IMG nodeLabel:div.textwidget > p > a > img.alignnone path:1,HTML,1,BODY,1,DIV,2,DIV,2,FOOTER,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,P,0,A,0,IMG selector:div.textwidget > p > a > img.alignnone snippet:<img loading="lazy" decoding="async" class="alignnone wp-image-3699 size-full" src="https://pydata.org/wp-content/uploads/2019/03/numfocus.png" alt="" width="200" height="57"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1268 height:343 left:0 right:1350 top:925 width:1350] lhId:page-7-DIV nodeLabel:PyData is an educational program of NumFOCUS, a 501(c)(3) nonprofit charity. B… path:1,HTML,1,BODY,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,2,DIV selector:div.entry-content > div.et-l > div.et_builder_inner_content > div.et_pb_section snippet:<div class="et_pb_section et_pb_section_2 et_pb_with_background et_section_regular"> type:node] score:0.024157 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:3199 height:57 left:990 right:1190 top:3142 width:200] lhId:page-16-IMG nodeLabel:div.textwidget > p > a > img.alignnone path:1,HTML,1,BODY,1,DIV,2,DIV,2,FOOTER,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,P,0,A,0,IMG selector:div.textwidget > p > a > img.alignnone snippet:<img loading="lazy" decoding="async" class="alignnone wp-image-3699 size-full" src="https://pydata.org/wp-content/uploads/2019/03/numfocus.png" alt="" width="200" height="57"> type:node]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2]] map[cause:Web font extra:map[type:url value:https://pydata.org/wp-content/themes/Divi/core/admin/fonts/modules/all/modules.woff]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/ptsans/v18/jizfRExUiTo99u79B_mh0OCtLQ.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwaPGQ.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/lato/v25/S6u8w4BMUTPHjxsAUi-q.woff2]] map[cause:Web font extra:map[type:url value:https://pydata.org/wp-content/plugins/easy-social-icons/css/font-awesome/webfonts/fa-brands-400.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:1268 height:343 left:0 right:1350 top:925 width:1350] lhId:page-7-DIV nodeLabel:PyData is an educational program of NumFOCUS, a 501(c)(3) nonprofit charity. B… path:1,HTML,1,BODY,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,2,DIV selector:div.entry-content > div.et-l > div.et_builder_inner_content > div.et_pb_section snippet:<div class="et_pb_section et_pb_section_2 et_pb_with_background et_section_regular"> type:node] score:0.011045 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:3199 height:57 left:990 right:1190 top:3142 width:200] lhId:page-16-IMG nodeLabel:div.textwidget > p > a > img.alignnone path:1,HTML,1,BODY,1,DIV,2,DIV,2,FOOTER,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,P,0,A,0,IMG selector:div.textwidget > p > a > img.alignnone snippet:<img loading="lazy" decoding="async" class="alignnone wp-image-3699 size-full" src="https://pydata.org/wp-content/uploads/2019/03/numfocus.png" alt="" width="200" height="57"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:738 height:74 left:1183 right:1264 top:664 width:81] lhId:page-14-BUTTON nodeLabel:div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-next path:1,HTML,1,BODY,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,BUTTON selector:div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-next snippet:<button type="button" role="presentation" class="owl-next"> type:node] score:3.1e-05 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:3199 height:57 left:990 right:1190 top:3142 width:200] lhId:page-16-IMG nodeLabel:div.textwidget > p > a > img.alignnone path:1,HTML,1,BODY,1,DIV,2,DIV,2,FOOTER,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,P,0,A,0,IMG selector:div.textwidget > p > a > img.alignnone snippet:<img loading="lazy" decoding="async" class="alignnone wp-image-3699 size-full" src="https://pydata.org/wp-content/uploads/2019/03/numfocus.png" alt="" width="200" height="57"> type:node]] map[cause:Web font extra:map[type:url value:https://pydata.org/wp-content/plugins/modern-events-calendar/assets/fonts/Simple-Line-Icons.woff2?v=2.3.1]]] type:subitems]]]

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
pydata.org/wp-content/themes/Divi/core/admin/fonts/modules/all/modules.woff	45 ms
/wp-content/plugins/easy-social-icons/css/font-awesome/we...	45 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	20 ms
fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2	10 ms
/wp-content/plugins/modern-events-calendar/assets/fonts/S...	10 ms

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:4.737 source:map[column:86743 line:2 type:source-location url:https://pydata.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 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:112.194 source:map[type:text value:[unattributed]]] map[reflowTime:1.012 source:map[column:86058 line:19 type:source-location url:https://js.hs-analytics.net/analytics/1776892800000/39929437.js urlProvider:network]] map[reflowTime:5.137 source:map[column:79427 line:1 type:source-location url:https://pydata.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:3.884 source:map[column:49615 line:1 type:source-location url:https://pydata.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:0.405 source:map[column:85575 line:1 type:source-location url:https://pydata.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:0.667 source:map[column:84992 line:1 type:source-location url:https://pydata.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]]]

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.et_builder_inner_content > div#home-hero > span.et_parallax_bg_wrap > span.et_parallax_bg `div.et_builder_inner_content > div#home-hero > span.et_parallax_bg_wrap > span.et_parallax_bg`	pydata.org/wp-content/uploads/2019/07/Hero-Image-2-v1.jpg	739.7 KiB	553.3 KiB
Email admin@pydata.org to sign up as a sponsor. Become a Sponsor `div.entry-content > div.et-l > div.et_builder_inner_content > div.et_pb_section`	pydata.org/wp-content/uploads/2019/05/pydata-london-audience.jpg	358.2 KiB	100.4 KiB
div.et_pb_column > div.et_pb_module > span.et_pb_image_wrap > img.wp-image-4313 `div.et_pb_column > div.et_pb_module > span.et_pb_image_wrap > img.wp-image-4313`	pydata.org/wp-content/uploads/2019/10/meetupmap.png	143.7 KiB	38.6 KiB
div.et_pb_text_inner > p > a > img.alignnone `div.et_pb_text_inner > p > a > img.alignnone`	pydata.org/wp-content/uploads/2017/07/NumFocus_LRG-300x100.png	12.5 KiB	7.7 KiB
PyData `li.centered-inline-logo-wrap > div.logo_container > a > img#logo`	pydata.org/wp-content/uploads/2019/06/pydata-logo-final.png	6.1 KiB	5.6 KiB
Eventbrite `ul#social-cta > li.cn-fa-eventbrite > a > img`	pydata.org/wp-content/uploads/2019/05/social-eventbrite-dark.png	4.1 KiB	4.0 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-SECTION

nodeLabel: A community for developers and users of open source data tools

path: 1,HTML,1,BODY,1,DIV,2,DIV,0,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,1,SECTION

selector: div.et-l > div.et_builder_inner_content > div#home-hero > section.et_pb_module

snippet: <section class="et_pb_module et_pb_fullwidth_header et_pb_fullwidth_header_0 et_pb_text_al…">

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

value: No additional origins are good candidates for preconnecting

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/css?family=Lato%3A100%2C+100italic%2C+300%2C+300italic%2...	538 B
/css?family=Montserrat%3A400%2C700%7CRoboto%3A100%2C300%2...	2.3 KiB	289 ms
/wp-content/plugins/modern-events-calendar/assets/js/mec-...	73.5 KiB	81 ms
/wp-content/plugins/modern-events-calendar/assets/css/fro...	64.8 KiB	243 ms
/wp-content/plugins/modern-events-calendar/app/addons/div...	1.2 KiB
pydata.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	30.2 KiB
pydata.org/wp-content/plugins/divi-footer-editor/css/custom.css?ver=1.1	508 B
/wp-content/plugins/modern-events-calendar/assets/js/fron...	28.7 KiB
/wp-content/plugins/dwd-custom-fullwidth-header-extended/...	4.8 KiB
/wp-content/plugins/modern-events-calendar/assets/js/even...	4.7 KiB
/wp-content/plugins/modern-events-calendar/assets/package...	1.3 KiB
pydata.org/wp-content/themes/Divi/style.css?v=1.0.5&ver=6.9.4	551 B
/wp-content/plugins/modern-events-calendar/assets/package...	635 B
pydata.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1	5.1 KiB
/wp-content/plugins/modern-events-calendar/assets/css/mec...	6.1 KiB
/wp-content/plugins/modern-events-calendar/assets/package...	1.7 KiB
pydata.org/wp-content/themes/Divi-child/style.css?ver=4.27.6	7.0 KiB
/wp-content/plugins/dwd-custom-fullwidth-header-extended/...	10.5 KiB
pydata.org/wp-content/plugins/easy-social-icons/js/cnss.js?ver=1.0	555 B
pydata.org/wp-content/uploads/wtfdivi/wp_head.css?ver=1532846104	302 B
/wp-content/plugins/modern-events-calendar/assets/package...	1.3 KiB
/wp-content/plugins/easy-social-icons/css/font-awesome/cs...	20.5 KiB	122 ms
pydata.org/wp-content/plugins/easy-social-icons/js/share.js?ver=1.0	597 B
/wp-content/plugins/modern-events-calendar/assets/package...	1.5 KiB
/wp-content/plugins/modern-events-calendar/assets/package...	693 B
/wp-content/plugins/modern-events-calendar/assets/package...	2.3 KiB
/wp-content/plugins/modern-events-calendar/assets/css/ico...	7.7 KiB
pydata.org/wp-content/plugins/add-to-any/addtoany.min.css?ver=1.16	852 B
pydata.org/wp-content/plugins/easy-social-icons/css/share.css?ver=1.0	836 B
/wp-content/plugins/easy-social-icons/css/font-awesome/cs...	4.4 KiB
pydata.org/wp-content/plugins/easy-social-icons/css/cnss.css?ver=1.0	3.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
i.ytimg.com/vi/J8cVPXnafos/maxresdefault.jpg	7200.0 s	141.2 KiB
js.hs-analytics.net/analytics/1776892800000/39929437.js	300.0 s	42.3 KiB
i.ytimg.com/vi_webp/J8cVPXnafos/sddefault.webp	7200.0 s	36.3 KiB
js.hubspot.com/web-interactives-embed.js	600.0 s	28.5 KiB
js.hs-banner.com/v2/39929437/banner.js	300.0 s	24.6 KiB
js.hsadspixel.net/pixels.js	600.0 s	3.9 KiB
js.hs-scripts.com/39929437.js	90.0 s	1.1 KiB
static.addtoany.com/menu/page.js	86400.0 s	2.2 KiB
pydata.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	2872.0 s	978 B
static.doubleclick.net/instream/ad_status.js	900.0 s	494 B

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

Diagnostics

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: 80 ms 26.7 KiB

URL	Transfer Size	Est Savings
/wp-content/plugins/modern-events-calendar/assets/js/fron...	28.5 KiB	11.6 KiB
/wp-content/plugins/modern-events-calendar/assets/package...	21.1 KiB	10.3 KiB
/wp-content/plugins/modern-events-calendar/assets/package...	8.3 KiB	4.9 KiB

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: 80 ms 105.1 KiB

URL	Transfer Size	Est Savings
/wp-content/plugins/modern-events-calendar/assets/css/fro...	64.5 KiB	64.0 KiB
/wp-content/plugins/easy-social-icons/css/font-awesome/cs...	20.2 KiB	19.9 KiB
@font-face{font-family:ETmodules;font-display:block;src:url(//pydata.org/wp-content/themes/Divi/cor…	13.3 KiB	11.0 KiB
/wp-content/plugins/dwd-custom-fullwidth-header-extended/...	10.2 KiB	10.2 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: 150 ms 380.2 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=AW-10863026222&cx=c&gtm=4e64k0	145.5 KiB	104.9 KiB
www.googletagmanager.com/gtag/js?id=G-TQ07LZCNVD	156.9 KiB	64.6 KiB
/wp-content/plugins/modern-events-calendar/assets/js/mec-...	73.2 KiB	62.2 KiB
www.googletagmanager.com/gtag/js?id=AW-10863026222	145.5 KiB	56.0 KiB
pydata.org/wp-content/themes/Divi/js/scripts.min.js?ver=4.27.6	70.0 KiB	45.2 KiB
/wp-content/plugins/modern-events-calendar/assets/js/fron...	28.5 KiB	26.2 KiB
static.addtoany.com/menu/modules/core.ydpp7jcu.js	25.8 KiB	21.1 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.3 KiB

URL	Transfer Size	Est Savings
pydata.org/wp-content/themes/Divi-child/style.css?ver=4.27.6	7.0 KiB	2.3 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
pydata.org/wp-content/uploads/2019/07/Hero-Image-2-v1.jpg	740.9 KiB
www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js	436.0 KiB
pydata.org/wp-content/uploads/2019/05/pydata-london-audience.jpg	359.0 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021...	183.1 KiB
www.googletagmanager.com/gtag/js?id=G-TQ07LZCNVD	157.2 KiB
www.googletagmanager.com/gtag/js?id=AW-10863026222	145.6 KiB
www.googletagmanager.com/gtag/js?id=AW-10863026222&cx=c&gtm=4e64k0	145.6 KiB
pydata.org/wp-content/uploads/2019/10/meetupmap.png	144.3 KiB
i.ytimg.com/vi/J8cVPXnafos/maxresdefault.jpg	141.2 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021...	140.1 KiB

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

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.

Element	Layout shift score
PyData is an educational program of NumFOCUS, a 501(c)(3) nonprofit charity. B… `div.entry-content > div.et-l > div.et_builder_inner_content > div.et_pb_section`	0.097
PyData is an educational program of NumFOCUS, a 501(c)(3) nonprofit charity. B… `div.entry-content > div.et-l > div.et_builder_inner_content > div.et_pb_section`	0.024
PyData is an educational program of NumFOCUS, a 501(c)(3) nonprofit charity. B… `div.entry-content > div.et-l > div.et_builder_inner_content > div.et_pb_section`	0.011
div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-next `div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-next`	0.000

●Time to Interactive 2.1 s

●Max Potential First Input Delay 80 ms

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●User Timing marks and measures 10 user timings

●JavaScript execution time 0.5 s

●Minimizes main-thread work 1.3 s

●Avoid long main-thread tasks 2 long tasks found

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 70 ms

●Server Backend Latencies 180 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 370 ms

○INP breakdown

○Avoid non-composited animations

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-prev `div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-prev`
div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-next `div.mec-event-carousel-type2 > div.mec-owl-crousel-skin-type2 > div.owl-nav > button.owl-next`

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.header-content-container > div.header-content > div.et_pb_header_content_wrapper > a `div.header-content-container > div.header-content > div.et_pb_header_content_wrapper > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-image > a`
div.et_pb_module > div.et_pb_text_inner > p > a `div.et_pb_module > div.et_pb_text_inner > p > a`
div.et_pb_module > div.et_pb_video_overlay > div.et_pb_video_overlay_hover > a.et_pb_video_play `div.et_pb_module > div.et_pb_video_overlay > div.et_pb_video_overlay_hover > a.et_pb_video_play`
div#text-6 > div.textwidget > p > a `div#text-6 > div.textwidget > p > a`

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
SPONSOR PYDATA `nav#top-menu-nav > ul#top-menu > li#menu-item-3758 > a`
Jul 13 - 19, 2026 `div.event-carousel-type2-head > div.mec-event-carousel-content-type2 > span.mec-event-date-info > span.mec-start-date-label`
Jul 24 - 25, 2026 `div.event-carousel-type2-head > div.mec-event-carousel-content-type2 > span.mec-event-date-info > span.mec-start-date-label`
Aug 10 - 15, 2026 `div.event-carousel-type2-head > div.mec-event-carousel-content-type2 > span.mec-event-date-info > span.mec-start-date-label`
Become a Member `div.et_pb_row > div.et_pb_column > div.et_pb_button_module_wrapper > a.et_pb_button`
View All Meetups `div.et_pb_row > div.et_pb_column > div.et_pb_button_module_wrapper > a.et_pb_button`
Start a Meetup `div.et_pb_row > div.et_pb_column > div.et_pb_button_module_wrapper > a.et_pb_button`
Become a Sponsor `div.header-content > div.et_pb_header_content_wrapper > p > a.et_pb_button`
Subscribe `div.et_pb_row > div.et_pb_column > div.et_pb_button_module_wrapper > a#subscribe-btn`
2026 — Design by Skytemple `div.container > p#footer-info > div#footer-editor-info > p`
Skytemple `p#footer-info > div#footer-editor-info > p > a`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Privacy Policy `div#text-5 > div.textwidget > p > a`
admin@pydata.org `div#text-4 > div.textwidget > p > a`

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
PYDATA PYCON YEREVAN `article.mec-event-article > div.event-carousel-type2-head > div.mec-event-carousel-content-type2 > h4.mec-event-carousel-title`
CONTACT US `div#footer-widgets > div.footer-widget > div#text-4 > h4.title`

These are opportunities to improve keyboard navigation in your application.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.js `html.js`

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-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●Image elements have `[alt]` attributes

●`[aria-hidden="true"]` elements do not contain focusable descendents

●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

●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.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA attributes are used as specified for the element's role

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted 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

○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

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

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

○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

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○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.

○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.

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.

Source	Description
pydata.org/wp-admin/js/color-picker.min.js?ver=6.9.4 line 1, col 21	`ReferenceError: wp is not defined at https://pydata.org/wp-admin/js/color-picker.min.js?ver=6.9.4:2:22 at https://pydata.org/wp-admin/js/color-picker.min.js?ver=6.9.4:2:3443`

●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 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

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`