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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.

35

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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:62.973 source:map[type:text value:[unattributed]]] map[reflowTime:4.818 source:map[column:49477 line:1 type:source-location url:https://www.dal.ca/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011ee1c126a6c1fd9fcd645daa97f89a.min.js urlProvider:network]] map[reflowTime:0.352 source:map[column:50173 line:1 type:source-location url:https://www.dal.ca/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011ee1c126a6c1fd9fcd645daa97f89a.min.js urlProvider:network]] map[reflowTime:0.263 source:map[column:50231 line:1 type:source-location url:https://www.dal.ca/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011ee1c126a6c1fd9fcd645daa97f89a.min.js urlProvider:network]] map[reflowTime:0.227 source:map[column:50295 line:1 type:source-location url:https://www.dal.ca/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011ee1c126a6c1fd9fcd645daa97f89a.min.js urlProvider:network]] map[reflowTime:0.772 source:map[column:49455 line:1 type:source-location url:https://www.dal.ca/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011ee1c126a6c1fd9fcd645daa97f89a.min.js urlProvider:network]] map[reflowTime:0.43 source:map[column:429908 line:1 type:source-location url:https://www.dal.ca/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011ee1c126a6c1fd9fcd645daa97f89a.min.js 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.

URLResource SizeEst Savings
two researchers examining plants div#teaser-82d97423f4 > div.cmp-teaser__image > div#teaser-82d97423f4-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container_433277233/t...138.9 KiB98.5 KiB
Dalhousie Studley Campus div.image > div#image-0c99fff8f5 > a.cmp-image__link > img.cmp-image__image
/_jcr_content/root/maincontent/main/container_433277233_/...139.0 KiB93.7 KiB
Dal Students on campus div#teaser-a0c49d2871 > div.cmp-teaser__image > div#teaser-a0c49d2871-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container_433277233/t...118.2 KiB77.7 KiB
Eight students are dancing on stage in costumes showcasing fashion from 1897. a.cmp-teaser__link > div.cmp-teaser__image > div#teaser-93729a85da-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container/container_c...78.5 KiB45.5 KiB
Posed shots of four recipients. a.cmp-teaser__link > div.cmp-teaser__image > div#teaser-6bfd9a2d46-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container/container_c...72.5 KiB39.5 KiB
a.cmp-teaser__link > div.cmp-teaser__image > div#teaser-34a5cc8aea-image > img.cmp-image__image a.cmp-teaser__link > div.cmp-teaser__image > div#teaser-34a5cc8aea-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container/container_c...59.6 KiB26.6 KiB
Three students sit on an orange sofa working on laptops. Behind them, windows o… div#hero-7fe1e4dd23 > div.cmp-teaser__image > div#hero-7fe1e4dd23-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/hero_816095912_copy.c...78.0 KiB25.1 KiB
Overhead shot of a brightly coloured street mural. a.cmp-teaser__link > div.cmp-teaser__image > div#teaser-a6088fefd3-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container_541149697_/...51.2 KiB19.7 KiB
A person in scuba gear underwater. a.cmp-teaser__link > div.cmp-teaser__image > div#teaser-947481e57e-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container_541149697_/...51.6 KiB15.9 KiB
A headshot of Dr. Blaine Fiss in a blue lab jacket. a.cmp-teaser__link > div.cmp-teaser__image > div#teaser-36c78f9730-image > img.cmp-image__image
/_jcr_content/root/maincontent/main/container/container_c...43.4 KiB10.4 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: Three students sit on an orange sofa working on laptops. Behind them, windows o…
path: 1,HTML,1,BODY,2,DIV,2,DIV,0,DIV,0,DIV,2,MAIN,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,IMG
selector: div#hero-7fe1e4dd23 > div.cmp-teaser__image > div#hero-7fe1e4dd23-image > img.cmp-image__image
snippet: <img src="https://www.dal.ca/_jcr_content/root/maincontent/main/hero_816095912_copy.…" srcset="https://www.dal.ca/_jcr_content/root/maincontent/main/hero_816095912_copy.…" class="cmp-image__image" itemprop="contentUrl" width="6240" height="4160" alt="Three students sit on an orange sofa working on laptops. Behind them, wind…">

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
/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_257...22.5 KiB
/css2?family=Public+Sans:ital,wght@0,100;0,200;0,300;0,40...1.3 KiB759 ms
/etc.clientlibs/core/wcm/components/page/v2/page/clientli...324 B
/etc.clientlibs/core/wcm/components/accordion/v1/accordio...219 B

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
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
/signals/config/1165669311003126?v=2.9.303&r=stable&domai...1200.0 s44.9 KiB
scripts.clarity.ms/0.8.59-beta/clarity.js0.0 ms26.1 KiB
/signals/config/117970075559907?v=2.9.303&r=stable&domain...1200.0 s18.4 KiB
/signals/config/329309355875603?v=2.9.303&r=stable&domain...1200.0 s16.4 KiB
/signals/config/965573722171828?v=2.9.303&r=stable&domain...1200.0 s16.4 KiB
/signals/config/1322335958189833?v=2.9.303&r=stable&domai...1200.0 s16.4 KiB
/signals/config/3322336551373660?v=2.9.303&r=stable&domai...1200.0 s16.3 KiB
/signals/config/902260850395912?v=2.9.303&r=stable&domain...1200.0 s16.3 KiB
/signals/config/687563759257831?v=2.9.303&r=stable&domain...1200.0 s16.3 KiB
/signals/config/1136035060711876?v=2.9.303&r=stable&domai...1200.0 s16.3 KiB
/signals/config/901595522693840?v=2.9.303&r=stable&domain...1200.0 s16.3 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
/collect?v=2&fmt=js&pid=4295716&time=1776889108041&li_ads...0.0 ms271 B
/tr/?id=901595522693840&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms20 B
/tr/?id=1165669311003126&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms16 B
/tr/?id=1322335958189833&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms16 B
/tr/?id=1136035060711876&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms16 B
/tr/?id=117970075559907&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B
/tr/?id=687563759257831&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B
/tr/?id=329309355875603&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B
/tr/?id=3322336551373660&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms16 B
/tr/?id=965573722171828&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B
/tr/?id=902260850395912&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 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
/etc.clientlibs/dal-main/clientlibs/clientlib-site/resour...15 ms

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

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

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: 1.4 s
URLTime Spent
dal.ca/1.4 s
www.dal.ca/0.0 ms

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: 300 ms 1012.0 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/destination?id=AW-976202791&cx=c&gtm=4e64k0144.4 KiB105.4 KiB
/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011...127.7 KiB68.2 KiB
www.googletagmanager.com/gtag/js?id=G-03M7E9DG13&cx=c&gtm=4e64k0155.4 KiB66.8 KiB
www.googletagmanager.com/gtag/js?id=G-10ZKDM5ZR2&cx=c&gtm=4e64k0153.4 KiB63.8 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js120.8 KiB63.0 KiB
www.googletagmanager.com/gtag/destination?id=AW-17976873880&cx=c&gtm=4e64k0144.2 KiB62.1 KiB
www.googletagmanager.com/gtag/destination?id=AW-16797833085&cx=c&gtm=4e64k0144.3 KiB62.0 KiB
www.googletagmanager.com/gtag/destination?id=AW-10884959375&cx=c&gtm=4e64k0144.3 KiB62.0 KiB
www.googletagmanager.com/gtag/destination?id=AW-11440401892&cx=c&gtm=4e64k0146.2 KiB61.9 KiB
www.googletagmanager.com/gtag/destination?id=AW-441325732&cx=c&gtm=4e64k0146.1 KiB61.9 KiB
www.googletagmanager.com/gtag/destination?id=AW-826908640&cx=c&gtm=4e64k0144.4 KiB61.8 KiB
www.googletagmanager.com/gtag/destination?id=AW-10854878465&cx=c&gtm=4e64k0144.3 KiB61.3 KiB
www.googletagmanager.com/gtag/destination?id=AW-11009127209&cx=c&gtm=4e64k0146.2 KiB61.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-MKVXFCZH153.7 KiB60.5 KiB
www.googletagmanager.com/gtag/destination?id=AW-11007919099&cx=c&gtm=4e64k0136.3 KiB58.9 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB31.5 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
Unattributable1.2 s99 ms0.0 ms
/etc.clientlibs/dal-main/clientlibs/clientlib-site.lt_011...760 ms350 ms60 ms
www.googletagmanager.com/gtm.js?id=GTM-MKVXFCZH508 ms416 ms74 ms
www.dal.ca/490 ms7.2 ms1.5 ms
www.googletagmanager.com/gtag/js?id=G-03M7E9DG13&cx=c&gtm=4e64k0388 ms318 ms64 ms
www.googletagmanager.com/gtag/destination?id=AW-441325732&cx=c&gtm=4e64k0375 ms249 ms55 ms
scripts.clarity.ms/0.8.59-beta/clarity.js373 ms321 ms25 ms
www.googletagmanager.com/gtag/destination?id=AW-11009127209&cx=c&gtm=4e64k0368 ms290 ms73 ms
www.googletagmanager.com/gtag/destination?id=AW-826908640&cx=c&gtm=4e64k0361 ms284 ms73 ms
www.googletagmanager.com/gtag/js?id=G-10ZKDM5ZR2&cx=c&gtm=4e64k0345 ms279 ms63 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js317 ms245 ms68 ms
www.googletagmanager.com/gtag/destination?id=AW-10854878465&cx=c&gtm=4e64k0306 ms239 ms65 ms
www.googletagmanager.com/gtag/destination?id=AW-11440401892&cx=c&gtm=4e64k0301 ms245 ms54 ms
www.googletagmanager.com/gtag/destination?id=AW-17976873880&cx=c&gtm=4e64k0292 ms234 ms55 ms
www.googletagmanager.com/gtag/destination?id=AW-10884959375&cx=c&gtm=4e64k0291 ms234 ms54 ms
www.googletagmanager.com/gtag/destination?id=AW-16797833085&cx=c&gtm=4e64k0288 ms232 ms53 ms
www.googletagmanager.com/gtag/destination?id=AW-11007919099&cx=c&gtm=4e64k0270 ms215 ms52 ms
connect.facebook.net/en_US/fbevents.js186 ms134 ms50 ms
/signals/config/1165669311003126?v=2.9.303&r=stable&domai...177 ms148 ms27 ms
/signals/config/1322335958189833?v=2.9.303&r=stable&domai...132 ms117 ms12 ms
/signals/config/117970075559907?v=2.9.303&r=stable&domain...105 ms86 ms13 ms
/signals/config/965573722171828?v=2.9.303&r=stable&domain...97 ms80 ms12 ms
/signals/config/1136035060711876?v=2.9.303&r=stable&domai...95 ms73 ms17 ms
/signals/config/3322336551373660?v=2.9.303&r=stable&domai...91 ms72 ms13 ms
/signals/config/329309355875603?v=2.9.303&r=stable&domain...90 ms73 ms12 ms
/signals/config/687563759257831?v=2.9.303&r=stable&domain...87 ms70 ms12 ms
/signals/config/902260850395912?v=2.9.303&r=stable&domain...87 ms69 ms12 ms
www.googletagmanager.com/gtag/destination?id=AW-976202791&cx=c&gtm=4e64k084 ms29 ms55 ms
/signals/config/901595522693840?v=2.9.303&r=stable&domain...73 ms56 ms13 ms
snap.licdn.com/li.lms-analytics/insight.min.js72 ms60 ms7.8 ms
analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.js61 ms39 ms21 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 Evaluation5.8 s
Other1.3 s
Script Parsing & Compilation1.2 s
Style & Layout503 ms
Garbage Collection283 ms
Rendering87 ms
Parse HTML & CSS85 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
www.googletagmanager.com/gtag/js?id=G-03M7E9DG13&cx=c&gtm=4e64k0155.4 KiB
/etc.clientlibs/dal-main/clientlibs/clientlib-site/resour...154.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-MKVXFCZH154.1 KiB
www.googletagmanager.com/gtag/js?id=G-10ZKDM5ZR2&cx=c&gtm=4e64k0153.5 KiB
www.googletagmanager.com/gtag/destination?id=AW-11009127209&cx=c&gtm=4e64k0146.2 KiB
www.googletagmanager.com/gtag/destination?id=AW-11440401892&cx=c&gtm=4e64k0146.2 KiB
www.googletagmanager.com/gtag/destination?id=AW-441325732&cx=c&gtm=4e64k0146.2 KiB
www.googletagmanager.com/gtag/destination?id=AW-976202791&cx=c&gtm=4e64k0144.4 KiB
www.googletagmanager.com/gtag/destination?id=AW-826908640&cx=c&gtm=4e64k0144.4 KiB
www.googletagmanager.com/gtag/destination?id=AW-16797833085&cx=c&gtm=4e64k0144.3 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
Dalhousie University Logo div.image > div#image-e80de876cf > a.cmp-image__link > img.cmp-image__image
/content/experience-fragments/www/global/homepage-header/...

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
●Reduce unused CSS
●User Timing marks and measures 55 user timings
●Avoid long main-thread tasks 20 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 220 ms
●Server Backend Latencies 290 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 0 ms
●Avoid large layout shifts 2 layout shifts found
○INP breakdown
94

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.

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
Learn more about studying at Dal div.aem-Grid > div.title > div#title-3fb6f8ecc9 > h3.cmp-title__text

These are opportunities to improve keyboard navigation in your application.

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
Website feedback div.content-teaser > ul#list-81501c058a > li.cmp-list__item > a.cmp-list__item-link
Privacy Statement div.content-teaser > ul#list-81501c058a > li.cmp-list__item > a.cmp-list__item-link

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>`
●`[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
●Document has a `<title>` element
●`<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
●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
○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.
○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.
77

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

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
/v3/__https://js.adsrvr.org/up_loader.1.1.0.js__;!!KFdHgM...
Failed to load resource: the server responded with a status of 404 ()
●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 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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