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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.

27

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:35.828 source:map[column:27323 line:2 type:source-location url:https://s30991.pcdn.co/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:144.877 source:map[type:text value:[unattributed]]] map[reflowTime:0.276 source:map[column:29078 line:1 type:source-location url:https://s30991.pcdn.co/wp-content/themes/mimas/dist/js/app.js urlProvider:network]] map[reflowTime:1.302 source:map[column:691533 line:1 type:source-location url:https://s30991.pcdn.co/wp-content/themes/mimas/dist/js/vendor.js urlProvider:network]] map[reflowTime:16.92 source:map[column:694150 line:1 type:source-location url:https://s30991.pcdn.co/wp-content/themes/mimas/dist/js/vendor.js urlProvider:network]] map[reflowTime:22.926 source:map[column:49615 line:1 type:source-location url:https://s30991.pcdn.co/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:10.346 source:map[column:49637 line:1 type:source-location url:https://s30991.pcdn.co/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:1.288 source:map[column:693855 line:1 type:source-location url:https://s30991.pcdn.co/wp-content/themes/mimas/dist/js/vendor.js urlProvider:network]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:2121.06 label:Time to first byte subpart:timeToFirstByte] map[duration:188.645 label:Resource load delay subpart:resourceLoadDelay] map[duration:26.475 label:Resource load duration subpart:resourceLoadDuration] map[duration:525.299 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-DIV
nodeLabel: Curtin Open Day 2026  Sunday 24 May, 10am to 3pm Explore courses, tour campus…
path: 1,HTML,3,BODY,9,MIMAS-MASTHEAD,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV
selector: div#slick-slide00 > div > div.mh-slide__container > div.mh-slide
snippet: <div class="mh-slide" style="--mh-slide-bg: url(https://s30991.pcdn.co/wp-content/uploads/sites/4/2026/…;" data-image-position="">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-DIV
nodeLabel: Curtin Open Day 2026  Sunday 24 May, 10am to 3pm Explore courses, tour campus…
path: 1,HTML,3,BODY,9,MIMAS-MASTHEAD,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV
selector: div#slick-slide00 > div > div.mh-slide__container > div.mh-slide
snippet: <div class="mh-slide" style="--mh-slide-bg: url(https://s30991.pcdn.co/wp-content/uploads/sites/4/2026/…;" data-image-position="">

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.

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
/images/1761ad94-f7b4-466f-ae5f-6e617c13c9fc/6538fb62-bdb...0.0 ms1.0 MiB
/images/1761ad94-f7b4-466f-ae5f-6e617c13c9fc/943ac062-c20...0.0 ms321.4 KiB
/images/1761ad94-f7b4-466f-ae5f-6e617c13c9fc/40cdd8e2-2ef...0.0 ms261.0 KiB
/images/1761ad94-f7b4-466f-ae5f-6e617c13c9fc/c9fabfe3-496...0.0 ms115.9 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
i.ytimg.com/vi/8DCiSMOQIx0/maxresdefault.jpg7200.0 s56.2 KiB
/signals/config/415133522630959?v=2.9.303&r=stable&domain...1200.0 s46.5 KiB
www.instagram.com/embed.js1200.0 s33.8 KiB
i.ytimg.com/vi_webp/duUZMki6DDI/maxresdefault.webp7200.0 s36.1 KiB
i.ytimg.com/vi_webp/40ddEmjZ46w/maxresdefault.webp7200.0 s34.3 KiB
scripts.clarity.ms/0.8.60-beta/clarity.js0.0 ms25.0 KiB
/signals/config/547059549414519?v=2.9.303&r=stable&domain...1200.0 s16.7 KiB
js.adsrvr.org/up_loader.1.1.0.js0.0 ms12.3 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
munchkin.marketo.net/munchkin.js0.0 ms1.2 KiB
js.adsrvr.org/universal_pixel.js0.0 ms958 B
/collect?v=2&fmt=js&pid=1376404&time=1776901333057&url=ht...0.0 ms691 B
/config/au/777363f7-8833-4ecc-a6cb-e757c2dcc623.js?v=3.56...0.0 ms477 B
static.doubleclick.net/instream/ad_status.js900.0 s495 B
/p.css?s=1&k=qji7bck&ht=tk&f=137.138.139.140.169.170.173....604800.0 s172 B
/tr/?id=415133522630959&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B
/tr/?id=547059549414519&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B
static.doubleclick.net/instream/ad_status.js900.0 s0 B
static.doubleclick.net/instream/ad_status.js900.0 s0 B

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
Schools must do more than box-ticking to support Indigenous kids: report div.thumb > div.thumb__nail > a > img.thumb-img
s30991.pcdn.co/news/wp-content/uploads/2026/04/SP-20150507-5625-1000x500.jpg169.2 KiB132.8 KiB
Panorama view of Miri city, Sarawak, Borneo, Malaysia div > div.mc-item > a.mc-link > img
/wp-content/uploads/sites/4/2022/12/AdobeStock_220638856-...196.9 KiB112.5 KiB
Nationally defined framework to recognise Culturally Significant Entities div.thumb > div.thumb__nail > a > img.thumb-img
/news/wp-content/uploads/2026/04/Martuwarra-Fitzroy-River...166.5 KiB104.3 KiB
Wide shot of Curtin's main Perth campus div > div.mc-item > a.mc-link > img
/wp-content/uploads/sites/4/2023/06/curtin-perth-2000x100...152.8 KiB98.7 KiB
Study looks to Africa to best support Aussies living with chronic conditions div.thumb > div.thumb__nail > a > img.thumb-img
s30991.pcdn.co/news/wp-content/uploads/2026/04/IMG-20251014-WA0014-1000x500.jpg102.5 KiB66.1 KiB
Curtin appoints Cisco leader to foster future tech talent div.thumb > div.thumb__nail > a > img.thumb-img
/news/wp-content/uploads/2026/04/Carl_Solder_Lecturing_20...79.6 KiB43.1 KiB
Mauritius div > div.mc-item > a.mc-link > img
s30991.pcdn.co/wp-content/uploads/sites/4/2022/12/Mauritius.jpeg.webp55.6 KiB29.6 KiB
Singapore div > div.mc-item > a.mc-link > img
s30991.pcdn.co/wp-content/uploads/sites/4/2022/12/Singapore.jpg.webp37.1 KiB17.8 KiB
Dubai div > div.mc-item > a.mc-link > img
s30991.pcdn.co/wp-content/uploads/sites/4/2022/12/Dubai.jpg.webp35.4 KiB16.1 KiB
Skyline of Colombo, Sri Lanka div > div.mc-item > a.mc-link > img
s30991.pcdn.co/wp-content/uploads/sites/4/2024/11/colombo_skyline.jpg.webp36.9 KiB10.9 KiB

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: 1.7 s
URLTime Spent
curtin.edu.au/1.7 s
www.curtin.edu.au/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 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.

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: 1.3 s 1.3 MiB
URLTransfer SizeEst Savings
s30991.pcdn.co/wp-content/themes/mimas/dist/js/vendor.js230.7 KiB208.4 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js120.9 KiB92.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-WKWRXD&l=dataCoreLayer183.2 KiB78.7 KiB
/gtag/destination?id=AW-696927740&l=dataCoreLayer&cx=c&gt...133.9 KiB67.3 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js120.9 KiB65.7 KiB
www.googletagmanager.com/gtag/js?id=G-EKWQ9HJQLL&l=dataCoreLayer&cx=c&gtm=4e64k1176.2 KiB64.9 KiB
www.googletagmanager.com/gtag/js?id=AW-798357996&l=dataCoreLayer&cx=c&gtm=4e64k1144.4 KiB62.4 KiB
www.googletagmanager.com/gtag/js?id=AW-969241043&l=dataCoreLayer&cx=c&gtm=4e64k1137.3 KiB61.4 KiB
www.googletagmanager.com/gtag/js?id=AW-845765649&l=dataCoreLayer&cx=c&gtm=4e64k1137.3 KiB61.4 KiB
www.googletagmanager.com/gtag/js?id=AW-809627420&l=dataCoreLayer&cx=c&gtm=4e64k1137.3 KiB61.4 KiB
www.googletagmanager.com/gtag/js?id=AW-845765595&l=dataCoreLayer&cx=c&gtm=4e64k1137.3 KiB61.4 KiB
www.googletagmanager.com/gtag/js?id=AW-603415810&l=dataCoreLayer&cx=c&gtm=4e64k1137.3 KiB61.4 KiB
www.googletagmanager.com/gtag/js?id=AW-845765673&l=dataCoreLayer&cx=c&gtm=4e64k1137.3 KiB60.7 KiB
www.googletagmanager.com/gtag/js?id=G-SWCC7XWPW9&l=dataCoreLayer&cx=c&gtm=4e64k1156.8 KiB60.0 KiB
www.googletagmanager.com/gtag/js?id=DC-14510064&l=dataCoreLayer&cx=c&gtm=4e64k1130.6 KiB57.4 KiB
s30991.pcdn.co/wp-content/themes/mimas/dist/js/2026/header.js?v=3.5.588.9 KiB56.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-PZM3KG&l=dataCoreLayer198.0 KiB52.6 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB31.8 KiB
www.instagram.com/embed.js33.7 KiB26.9 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
s30991.pcdn.co/wp-includes/js/jquery/jquery.min.js?ver=3.7.12.1 s1.6 s7.5 ms
Unattributable1.5 s96 ms0.0 ms
www.curtin.edu.au/1.4 s21 ms2.6 ms
s30991.pcdn.co/wp-content/themes/mimas/dist/js/vendor.js658 ms92 ms62 ms
www.googletagmanager.com/gtm.js?id=GTM-PZM3KG&l=dataCoreLayer519 ms437 ms55 ms
www.googletagmanager.com/gtm.js?id=GTM-WKWRXD&l=dataCoreLayer453 ms392 ms41 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js448 ms318 ms122 ms
www.googletagmanager.com/gtag/js?id=G-EKWQ9HJQLL&l=dataCoreLayer&cx=c&gtm=4e64k1345 ms304 ms35 ms
www.googletagmanager.com/gtag/js?id=DC-14510064&l=dataCoreLayer&cx=c&gtm=4e64k1324 ms206 ms56 ms
/gtag/destination?id=AW-696927740&l=dataCoreLayer&cx=c&gt...294 ms242 ms51 ms
scripts.clarity.ms/0.8.60-beta/clarity.js269 ms212 ms5.0 ms
www.googletagmanager.com/gtag/js?id=G-SWCC7XWPW9&l=dataCoreLayer&cx=c&gtm=4e64k1263 ms229 ms32 ms
sc-static.net/scevent.min.js252 ms192 ms8.6 ms
s30991.pcdn.co/wp-content/themes/mimas/dist/js/2026/header.js?v=3.5.5217 ms117 ms18 ms
www.googletagmanager.com/gtag/js?id=AW-603415810&l=dataCoreLayer&cx=c&gtm=4e64k1214 ms189 ms24 ms
www.googletagmanager.com/gtag/js?id=AW-845765673&l=dataCoreLayer&cx=c&gtm=4e64k1213 ms181 ms30 ms
www.googletagmanager.com/gtag/js?id=AW-798357996&l=dataCoreLayer&cx=c&gtm=4e64k1204 ms174 ms28 ms
www.googletagmanager.com/gtag/js?id=AW-969241043&l=dataCoreLayer&cx=c&gtm=4e64k1197 ms155 ms40 ms
www.googletagmanager.com/gtag/js?id=AW-809627420&l=dataCoreLayer&cx=c&gtm=4e64k1195 ms160 ms33 ms
www.googletagmanager.com/gtag/js?id=AW-845765595&l=dataCoreLayer&cx=c&gtm=4e64k1189 ms162 ms26 ms
snap.licdn.com/li.lms-analytics/insight.min.js169 ms104 ms60 ms
www.googletagmanager.com/gtag/js?id=AW-845765649&l=dataCoreLayer&cx=c&gtm=4e64k1163 ms138 ms23 ms
/signals/config/415133522630959?v=2.9.303&r=stable&domain...137 ms120 ms13 ms
connect.facebook.net/en_US/fbevents.js119 ms86 ms30 ms
/signals/config/547059549414519?v=2.9.303&r=stable&domain...70 ms61 ms6.5 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 Evaluation6.5 s
Other2.3 s
Style & Layout1.2 s
Script Parsing & Compilation871 ms
Garbage Collection341 ms
Rendering209 ms
Parse HTML & CSS129 ms

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

Layout shift culprits
Optimize DOM size
Modern HTTP
Optimize viewport for mobile
Minify CSS
Minify JavaScript
User Timing marks and measures 13 user timings
Avoid long main-thread tasks 20 long tasks found
Avoid non-composited animations 17 animated elements found
Image elements have explicit `width` and `height`
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 300 ms
Server Backend Latencies 260 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 600 ms
Avoid large layout shifts 1 layout shift found
INP breakdown
90

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
mimas-block > form.search-form > fieldset.search-bar > button.search-clear mimas-block > form.search-form > fieldset.search-bar > button.search-clear

Including a skip link can help users skip to the main content to save time. Learn more about skip links.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Skip to the content body.home > nav.skip-links > a.skip-to-content
Skip to search body.home > nav.skip-links > a
Skip to secondary navigation body.home > nav.skip-links > 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.

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
Explore our study areas article.mimas-grid > mimas-block > section.study-areas > h4

These are opportunities to improve keyboard navigation in your application.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Study Study Study at Curtin Find a course Explore course types Browse study are… div.mm-ocd > div.mm-ocd__content > nav.header__mobile-nav > ul.first-level
Study Study at Curtin Find a course Explore course types Browse study areas Ent… nav.header__mobile-nav > ul.first-level > li > ul#sub-menu-1
Life at Curtin Life at Curtin Regional study Living in Perth Learning and study… nav.header__mobile-nav > ul.first-level > li > ul#sub-menu-2
Engage Engage For industry For education providers, teachers and advisors For a… nav.header__mobile-nav > ul.first-level > li > ul#sub-menu-3
About About Curtin Respect at Curtin Rankings and reputation Learning and teach… nav.header__mobile-nav > ul.first-level > li > ul#sub-menu-4
Research Research at Curtin Research areas Higher degrees by research Our resea… nav.header__mobile-nav > ul.first-level > li > ul#sub-menu-5
News & events News Events Media Centre nav.header__mobile-nav > ul.first-level > li > ul#sub-menu-6

These are opportunities to improve the experience of reading tabular or list data using 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
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
`[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
`<frame>` or `<iframe>` elements have a title
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
Links have a discernible name
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.
Document has a main landmark.
Deprecated ARIA roles were not used
ARIA IDs are unique
Image elements do not have `[alt]` attributes that are redundant text.
Elements with visible text labels have matching accessible names.
`[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
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
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.
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
Identical links have the same purpose.
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
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 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
robots.txt is valid
Image elements have `[alt]` attributes
Document has a valid `hreflang`
Document has a valid `rel=canonical`

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