Lighthouse Mobile

· 0 checks — Mobile 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.

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
/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js	86400.0 s	559.9 KiB
/Home/FeatureEvents/2021/Images/74030-FeatureThumb-720x31...	86400.0 s	385.2 KiB
www.nottingham.ac.uk/Home/FeatureEvents/2021/Images/Webinar-Cohen-720.png	86400.0 s	187.6 KiB
cdn-ukwest.onetrust.com/scripttemplates/202503.1.0/otBannerSdk.js	86400.0 s	116.0 KiB
/etc.clientlibs/uon/clientlibs/clientlib-v2/resources/ima...	86400.0 s	62.6 KiB
/etc.clientlibs/uon/clientlibs/clientlib-v2/resources/fon...	86400.0 s	46.7 KiB
/etc.clientlibs/uon/clientlibs/clientlib-v2/resources/fon...	86400.0 s	35.2 KiB
cdn-ukwest.onetrust.com/logos/static/ot_company_logo.png	86400.0 s	19.1 KiB
/etc.clientlibs/uon/clientlibs/clientlib-headerv2.min.css	0.0 ms	6.5 KiB
/logos/b46049d7-a415-4e33-bd3c-1a4c5022b50a/eca345c8-ac38...	86400.0 s	15.7 KiB
/etc.clientlibs/uon/clientlibs/clientlib-headerv2.min.js?...	0.0 ms	4.9 KiB
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/etc.clientlibs/uon/clientlibs/clientlib-site/resources/i...	86400.0 s	4.3 KiB
cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg	86400.0 s	2.5 KiB
cdn-ukwest.onetrust.com/logos/static/ot_close.svg	86400.0 s	633 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.

URL	Est Savings
/SiteElementsHomepage/css/fonts/lineto-circular-pro-bold-...	40 ms
www.nottingham.ac.uk/SiteElementsHomepage/css/fonts/lora/Lora-Bold.woff	40 ms
/SiteElementsHomepage/css/fonts/lineto-circular-pro-mediu...	40 ms
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/webfonts/fa-brands-400.woff2	40 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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:41.2 source:map[column:3774 line:5 type:source-location url:https://www.nottingham.ac.uk/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVAzF2AgEiZAQn_RB8q1D-OpipawIamHu-r6UwDtePXpIVa2V6pnJ_gcL_OhkiR9WkXq50FLfVzbD0&t=639039886149830248&build=171154 urlProvider:network]] map[reflowTime:7.702 source:map[column:5688 line:5 type:source-location url:https://www.nottingham.ac.uk/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVAzF2AgEiZAQn_RB8q1D-OpipawIamHu-r6UwDtePXpIVa2V6pnJ_gcL_OhkiR9WkXq50FLfVzbD0&t=639039886149830248&build=171154 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
RobertOwenLab `div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img`	/PressReleaseLongForm-Images/Science/RobertOwenLab.x18bbc...	486.7 KiB	483.4 KiB
PlasmaSprayTorch-in-action_Engineeringweb `div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img`	/PressReleaseLongForm-Images/Engineering/PlasmaSprayTorch...	430.4 KiB	416.7 KiB
Undergraduate students walking outside the Monica Partridge Building `form#form1 > div.homepage-hero-banner > div.banner-background > img.mobile-banner-image`	/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World...	425.3 KiB	404.1 KiB
Unjust incarceration of U.S. immigrants during World War II `div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img`	/Home/FeatureEvents/2021/Images/74030-FeatureThumb-720x31...	384.5 KiB	372.4 KiB
FossillGreatDying `div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img`	/PressReleaseLongForm-Images/Science/FossillGreatDying.xa...	308.1 KiB	289.9 KiB
Profit with purpose: how impact investing is reshaping capitalism `div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img`	www.nottingham.ac.uk/Home/FeatureEvents/2021/Images/Webinar-Cohen-720.png	187.0 KiB	174.9 KiB
Face on blue background made up of lots of people standing together `div.row > div.col-md-6 > div.imageWhiteCTA-card > img.background-image`	/Homepage-2021/Images/Tiles/Vision-standard-banner.x933a2...	113.1 KiB	97.3 KiB
Centre for SustainableChemistry `div.row > div.col-md-6 > div.imageWhiteCTA-card > img.background-image`	/Homepage-2021/Images/Tiles/Centre-for-Sustainable-Chemis...	60.9 KiB	45.1 KiB
Athena Swan Race Charter gold award `div.d-inline > div.row > div.col-6 > img.partner-icon`	/Homepage-2021/Images/Partners/athena-awan-race-charter-g...	33.7 KiB	31.2 KiB
The American Congress `div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img`	/PressReleaseLongForm-Images/Arts/We-the-People-exhibitio...	43.6 KiB	30.7 KiB
Microscope `div.row > div.col-lg-6 > div.image-container > img`	/Homepage-2021/Images/Tiles/Microscope.xc38aa90b.jpg?w=80...	50.7 KiB	30.4 KiB
Race charter bronze award `div.d-inline > div.row > div.col-6 > img.partner-icon`	www.nottingham.ac.uk/Homepage-2021/Images/Partners/race-charter.xf76e96e7.jpg	26.6 KiB	24.1 KiB
UoN Logo `div.ot-sdk-container > div.ot-sdk-row > div#onetrust-group-container > img.ot-bnr-logo`	/logos/b46049d7-a415-4e33-bd3c-1a4c5022b50a/eca345c8-ac38...	15.5 KiB	14.8 KiB
Group of people in form of world map `div.row > div.col-md-6 > div.imageWhiteCTA-card > img.background-image`	/Homepage-2021/Images/Tiles/ref-results-banner.x25fdc42f....	25.5 KiB	9.7 KiB
Russel group logo `div.d-inline > div.row > div.col-6 > img.partner-icon`	www.nottingham.ac.uk/Homepage-2021/Images/Partners/russelgroup.x2b5e6786.png	10.2 KiB	8.0 KiB
U21 Universitas `div.d-inline > div.row > div.col-6 > img.partner-icon`	/Homepage-2021/Images/Partners/universitias21-logo.xf07b4...	6.0 KiB	4.7 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-IMG

nodeLabel: Undergraduate students walking outside the Monica Partridge Building

path: 1,HTML,1,BODY,0,FORM,15,DIV,0,DIV,2,IMG

selector: form#form1 > div.homepage-hero-banner > div.banner-background > img.mobile-banner-image

snippet: <img class="mobile-banner-image d-block d-sm-none" src="/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World/Mobile/students-…" alt="Undergraduate students walking outside the Monica Partridge Building">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js	559.9 KiB	7.0 s
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	9.1 KiB	167 ms
/etc.clientlibs/uon/clientlibs/clientlib-headerv2.min.css	6.5 KiB	905 ms
/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVA...	32.7 KiB	1.1 s
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css	19.0 KiB	1.3 s
www.nottingham.ac.uk/SiteElements/Javascript/aadatalayer.js	2.7 KiB
www.nottingham.ac.uk/SiteElements/Javascript/gecko-form.js	1.1 KiB
/SiteElementsHomepage/js/search-web-resource.js?renew=1&v...	961 B
www.nottingham.ac.uk/SiteElements/Javascript/gecko-cookie.js	903 B
www.nottingham.ac.uk/Homepage-2021/Stylesheets/header-v2.css?version=9632927	1.0 KiB
/siteelements/stylesheets/2022/responsive-2022.css?versio...	6.5 KiB	150 ms
www.nottingham.ac.uk/Homepage-2021/Stylesheets/footer.css?version=9549158	2.2 KiB
/siteelements/stylesheets/2022/global-2022.css?version=95...	28.2 KiB	1.1 s
www.nottingham.ac.uk/Homepage-2021/Stylesheets/homepage-2024.css?version=9627499	4.6 KiB	300 ms
www.nottingham.ac.uk/homepage-2021/stylesheets/style.css?version=9578931	2.5 KiB
fonts.googleapis.com/icon?family=Material+Icons	817 B	818 ms
maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css	7.4 KiB	984 ms
cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/js/modaal.min.js	4.9 KiB	333 ms
cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/css/modaal.min.css	2.5 KiB	166 ms
cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css	25.2 KiB	1.4 s
/npm/@accessible360/accessible-slick@1.0.1/slick/slick.mi...	10.7 KiB	450 ms
/npm/@accessible360/accessible-slick@1.0.1/slick/accessib...	1.2 KiB
cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/slick.min.css	543 B	150 ms

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: 844 ms

URL	Time Spent
nottingham.ac.uk/	844 ms
www.nottingham.ac.uk/	0.0 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 88.9 KiB

URL	Transfer Size	Est Savings
/siteelements/stylesheets/2022/global-2022.css?version=95...	27.7 KiB	27.5 KiB
cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css	24.7 KiB	23.8 KiB
	21.8 KiB	19.4 KiB
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css	18.4 KiB	18.2 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 62.2 KiB

URL	Transfer Size	Est Savings
cdn-ukwest.onetrust.com/scripttemplates/202503.1.0/otBannerSdk.js	115.8 KiB	62.2 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.

URL	Total CPU Time	Script Evaluation	Script Parse
/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js	1.5 s	973 ms	506 ms
Unattributable	426 ms	52 ms	0.0 ms
cdn-ukwest.onetrust.com/scripttemplates/202503.1.0/otBannerSdk.js	271 ms	190 ms	42 ms
/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVA...	264 ms	41 ms	7.8 ms
www.nottingham.ac.uk/	253 ms	114 ms	6.9 ms
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	86 ms	78 ms	2.1 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.

Category	Time Spent
Script Evaluation	1.5 s
Script Parsing & Compilation	578 ms
Other	448 ms
Style & Layout	314 ms
Parse HTML & CSS	110 ms
Garbage Collection	44 ms
Rendering	32 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable

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 7.1 KiB

URL	Transfer Size	Est Savings
/siteelements/stylesheets/2022/global-2022.css?version=95...	28.2 KiB	4.8 KiB
/siteelements/stylesheets/2022/responsive-2022.css?versio...	6.5 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
/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World...	610.0 KiB
/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js	559.9 KiB
/PressReleaseLongForm-Images/Science/RobertOwenLab.x18bbc...	487.5 KiB
/PressReleaseLongForm-Images/Engineering/PlasmaSprayTorch...	431.2 KiB
/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World...	426.1 KiB
/Home/FeatureEvents/2021/Images/74030-FeatureThumb-720x31...	385.2 KiB
/PressReleaseLongForm-Images/Science/FossillGreatDying.xa...	308.8 KiB
www.nottingham.ac.uk/Home/FeatureEvents/2021/Images/Webinar-Cohen-720.png	187.6 KiB
cdn-ukwest.onetrust.com/scripttemplates/202503.1.0/otBannerSdk.js	116.0 KiB
/Homepage-2021/Images/Tiles/Vision-standard-banner.x933a2...	113.8 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
Russel group logo `div.d-inline > div.row > div.col-6 > img.partner-icon`	www.nottingham.ac.uk/Homepage-2021/Images/Partners/russelgroup.x2b5e6786.png
U21 Universitas `div.d-inline > div.row > div.col-6 > img.partner-icon`	/Homepage-2021/Images/Partners/universitias21-logo.xf07b4...
Athena Swan Race Charter gold award `div.d-inline > div.row > div.col-6 > img.partner-icon`	/Homepage-2021/Images/Partners/athena-awan-race-charter-g...
Race charter bronze award `div.d-inline > div.row > div.col-6 > img.partner-icon`	www.nottingham.ac.uk/Homepage-2021/Images/Partners/race-charter.xf76e96e7.jpg

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 JavaScript

●Avoid long main-thread tasks 11 long tasks found

●Avoid non-composited animations 2 animated elements found

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 70 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 40 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○User Timing marks and measures

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

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Quick links `div#accordionExample > div.accordion-item > h2#Quick_links-heading > a.accordion-button`
Students `div#accordionExample > div.accordion-item > h2#Students-heading > a.accordion-button`
Staff `div#accordionExample > div.accordion-item > h2#Staff-heading > a.accordion-button`
Alumni `div#accordionExample > div.accordion-item > h2#Alumni-heading > a.accordion-button`

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.

Names and labels

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Select study level Undergraduate Postgraduate Research opportunities Apprentice… `div.row > div.col-md-4 > div.search-select > select#cfinder-filter`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Go to slide 1 `div.news-carousel > ul.slick-dots > li.slick-active > button`
Go to slide 2 `div.news-carousel > ul.slick-dots > li > button`
Go to slide 3 `div.news-carousel > ul.slick-dots > li > button`
Go to slide 4 `div.news-carousel > ul.slick-dots > li > button`

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

●`[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 with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[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 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

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<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

○Links are distinguishable without relying on color.

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

○`<object>` elements have alternate text

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
UoN Logo `div.ot-sdk-container > div.ot-sdk-row > div#onetrust-group-container > img.ot-bnr-logo`	/logos/b46049d7-a415-4e33-bd3c-1a4c5022b50a/eca345c8-ac38...	64 x 64 (1.00)	243 x 90 (2.70)

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
UoN Logo `div.ot-sdk-container > div.ot-sdk-row > div#onetrust-group-container > img.ot-bnr-logo`	/logos/b46049d7-a415-4e33-bd3c-1a4c5022b50a/eca345c8-ac38...	64 x 64	243 x 90	96 x 96

●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

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

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

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
/news/exhibition-marks-250-years-since-the-declaration-of...	Read more
/news/how-primitive-plants-evolved-to-survive-earths-most...	Read more
www.nottingham.ac.uk/news/engineers-develop-new-plasma-spray-technique	Read more
/news/3d-printing-will-enable-researchers-to-see-how-huma...	Read more
/news/exhibition-marks-250-years-since-the-declaration-of...	Read more
/news/how-primitive-plants-evolved-to-survive-earths-most...	Read more
www.nottingham.ac.uk/news/engineers-develop-new-plasma-spray-technique	Read more
/news/3d-printing-will-enable-researchers-to-see-how-huma...	Read more
/news/exhibition-marks-250-years-since-the-declaration-of...	Read more
/home/featureevents/2026/unjust-incarceration-of-u.s.-imm...	Read more
/home/featureevents/2026/profit-with-purpose-how-impact-i...	Read more
cookiepedia.co.uk/giving-consent-to-cookies	More information

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

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
Quick links `div#accordionExample > div.accordion-item > h2#Quick_links-heading > a.accordion-button`
Students `div#accordionExample > div.accordion-item > h2#Students-heading > a.accordion-button`
Staff `div#accordionExample > div.accordion-item > h2#Staff-heading > a.accordion-button`
Alumni `div#accordionExample > div.accordion-item > h2#Alumni-heading > a.accordion-button`

To appear in search results, crawlers need access to your app.

○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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`