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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.

40

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
/sites/files/oxford/styles/ow_large_feature/s3/bcar_ug_tw...1209600.0 s189.2 KiB
/sites/files/oxford/styles/ow_large_feature/s3/bcar_ashmo...1209600.0 s160.3 KiB
/sites/files/oxford/styles/ow_large_feature/s3/field/fiel...1209600.0 s141.5 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js604800.0 s123.3 KiB
sjs.bizographics.com/insight.min.js28621.0 s16.6 KiB
www.ox.ac.uk/sites/default/themes/custom/oxweb/images/oxweb-footer-icons-v8.png86400.0 s15.3 KiB
www.ox.ac.uk/sites/default/themes/custom/oxweb/images/oxweb-logo-rect.svg86400.0 s12.4 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.7 KiB
www.ox.ac.uk/sites/files/oxford/st_ox_current5.jpg1209600.0 s41.5 KiB
www.ox.ac.uk/sites/files/oxford/st_ox_undergrad3.jpg1209600.0 s32.5 KiB
www.ox.ac.uk/sites/files/oxford/st_ox_grad2.jpg1209600.0 s31.1 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_reu...1209600.0 s29.9 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oed...1209600.0 s26.4 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_nat...1209600.0 s25.3 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oup...1209600.0 s23.8 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oxp...1209600.0 s21.8 KiB
www.ox.ac.uk/sites/files/oxford/st_ox_conted6.jpg1209600.0 s18.1 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_spa...1209600.0 s18.0 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oxf...1209600.0 s17.8 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_his...1209600.0 s16.6 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_con...1209600.0 s16.3 KiB
/sites/files/oxford/styles/ow_listing/s3/field/field_imag...1209600.0 s15.4 KiB
/sites/files/oxford/styles/ow_listing/s3/field/field_imag...1209600.0 s15.0 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_odi...1209600.0 s13.2 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_pod...1209600.0 s13.1 KiB
/sites/files/oxford/styles/ow_listing/s3/field/field_imag...1209600.0 s12.7 KiB
/sites/files/oxford/styles/ow_small_highlight/s3/disc_qua...1209600.0 s10.7 KiB
www.ox.ac.uk/sites/default/themes/custom/oxweb/images/info-icon@x2.png86400.0 s2.2 KiB
/collect?v=2&fmt=js&pid=9293&time=1775323091473&url=https...0.0 ms695 B
/sites/default/themes/custom/oxweb/images/carousel-chevro...86400.0 s1.6 KiB
/sites/default/themes/custom/oxweb/images/carousel-chevro...86400.0 s1.6 KiB
www.ox.ac.uk/sites/default/themes/custom/oxweb/images/search-icon.png86400.0 s822 B
/sites/default/themes/custom/oxweb/images/highlight-chevr...86400.0 s799 B
www.ox.ac.uk/sites/default/themes/custom/oxweb/images/whopper.png86400.0 s598 B

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:142.581 source:map[column:640 line:4 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js 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:95.754 source:map[column:30882 line:3 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.501 source:map[column:30979 line:3 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.361 source:map[column:31260 line:3 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.09 source:map[column:31351 line:3 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.189 source:map[column:31632 line:3 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.249 source:map[column:31782 line:3 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.281 source:map[column:31900 line:3 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.275 source:map[column:41 line:1066 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:19.761 source:map[column:5688 line:5 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:4.537 source:map[column:26533 line:5 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:11.263 source:map[column:6794 line:5 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:8.942 source:map[column:3774 line:5 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.js urlProvider:network]] map[reflowTime:0.378 source:map[column:3796 line:5 type:source-location url:https://www.ox.ac.uk/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB9bfVJ_3N7-eC3gKeS-sI__ATnX8WF8ltra-g2RmFaF163qjG6u_xdvxVSENyHJmQk__h7T-cjtV_dUO9EYp5xzvQZuTpmuCIt2rzPKmYSUARw8.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 students sitting outside in college div.field > span.field-item-single > div.ds-1col > img
/sites/files/oxford/styles/ow_large_feature/s3/bcar_ug_tw...188.6 KiB172.6 KiB
Group of current student in quad ul.study-group-two > li.study-type > a > img.media-element
www.ox.ac.uk/sites/files/oxford/st_ox_current5.jpg40.9 KiB36.3 KiB
Old magazine div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_reu...29.3 KiB27.5 KiB
Undergrad students 3 ul.study-group-one > li.study-type > a > img.media-element
www.ox.ac.uk/sites/files/oxford/st_ox_undergrad3.jpg32.0 KiB27.3 KiB
Grad students 2 ul.study-group-one > li.study-type > a > img.media-element
www.ox.ac.uk/sites/files/oxford/st_ox_grad2.jpg30.5 KiB25.9 KiB
Array of food div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oed...25.8 KiB24.0 KiB
Eggs illustration div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_nat...24.7 KiB22.9 KiB
Greek frieze div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oup...23.2 KiB21.4 KiB
Oxplore equality div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oxp...21.2 KiB19.4 KiB
F1 car speeding by div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_spa...17.4 KiB15.6 KiB
Oxford skyline in black and white div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_oxf...17.2 KiB15.4 KiB
Kids in a museum div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_his...16.0 KiB14.2 KiB
woman reading div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_con...15.7 KiB14.0 KiB
Adult students in a seminar ul.study-group-two > li.study-type > a > img.media-element
www.ox.ac.uk/sites/files/oxford/st_ox_conted6.jpg17.5 KiB12.9 KiB
Solar farm in Africa div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_odi...12.6 KiB11.2 KiB
podcast human interface div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_pod...12.5 KiB11.1 KiB
Space trash div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_small_highlight/s3/disc_qua...10.2 KiB9.0 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-17-IMG
nodeLabel: Oxford's women claim victory in the 2026 Boat Race
path: 1,HTML,1,BODY,3,SECTION,3,SECTION,0,DIV,0,DIV,0,SECTION,0,SECTION,1,DIV,1,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,UL,0,LI,0,DIV,0,A,0,DIV,0,DIV,0,SPAN,0,IMG
selector: div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
snippet: <img typeof="foaf:Image" src="https://www.ox.ac.uk/sites/files/oxford/styles/ow_listing/s3/field/field_i…" width="370" height="222" alt="Oxford's women claim victory in the 2026 Boat Race">

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.

URLTransfer SizeDuration
/sites/files/oxford/advagg_js/js__9q_RhUzRB9SYU1-amhF7x_i...46.5 KiB967 ms
/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB...44.9 KiB1.6 s
/sites/files/oxford/advagg_js/js__g6HAL4XtohiHzS9CG4SIugq...12.5 KiB494 ms
/sites/files/oxford/advagg_js/js__9o6MTP80DXWHri8ze4nKy9q...1.1 KiB178 ms
/sites/files/oxford/advagg_css/css__WcyGoWryerB6FTiefeluO...12.5 KiB494 ms
/sites/files/oxford/advagg_css/css__spdjcEZR5oB7JDp-aKZkg...5.0 KiB651 ms
/sites/files/oxford/advagg_css/css__BJ6Ou6QsBRtnFTmxaakam...2.6 KiB178 ms
/sites/files/oxford/advagg_css/css__MarV35vNLf0_XPV9JUJLb...36.7 KiB1.8 s
/sites/files/oxford/advagg_js/js__z5ONFBC5kmHZRZuHWswENYj...9.6 KiB494 ms
/sites/files/oxford/advagg_css/css__Oz20qOQtvbB-9QPNXbkEm...1.3 KiB494 ms
/sites/files/oxford/advagg_css/css__UY0etF999x6scvHTvffNH...1.3 KiB494 ms
/sites/files/oxford/advagg_css/css__OyUP6r6gWDd7g9HyyAPkK...1.9 KiB494 ms

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

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.

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

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: 270 ms 32.7 KiB
URLTransfer SizeEst Savings
/sites/files/oxford/advagg_js/js__9q_RhUzRB9SYU1-amhF7x_i...46.0 KiB13.4 KiB
/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB...44.4 KiB9.6 KiB
/sites/files/oxford/advagg_js/js__z5ONFBC5kmHZRZuHWswENYj...9.2 KiB5.7 KiB
/sites/files/oxford/advagg_js/js__g6HAL4XtohiHzS9CG4SIugq...12.0 KiB4.0 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: 270 ms 32.2 KiB
URLTransfer SizeEst Savings
/sites/files/oxford/advagg_css/css__MarV35vNLf0_XPV9JUJLb...36.2 KiB32.2 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: 1.4 s 146.9 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-TDB29T137.7 KiB66.2 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js122.9 KiB57.1 KiB
/sites/files/oxford/advagg_js/js__9q_RhUzRB9SYU1-amhF7x_i...46.0 KiB23.6 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
/sites/files/oxford/advagg_js/js__ihdwYz7z62m5viS1EMhNOpB...1.2 s488 ms26 ms
www.googletagmanager.com/gtm.js?id=GTM-TDB29T504 ms383 ms77 ms
Unattributable459 ms14 ms0.0 ms
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js411 ms344 ms66 ms
www.ox.ac.uk/403 ms16 ms5.4 ms
sjs.bizographics.com/insight.min.js134 ms107 ms8.2 ms
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...66 ms41 ms4.9 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation1.4 s
Style & Layout861 ms
Other652 ms
Script Parsing & Compilation229 ms
Parse HTML & CSS176 ms
Rendering55 ms

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

●Layout shift culprits
●Document request latency
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Avoids enormous network payloads Total size was 1,559 KiB
●Avoid long main-thread tasks 8 long tasks found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 10 ms
●Server Backend Latencies 170 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 30 ms
○INP breakdown
○User Timing marks and measures
○Avoid non-composited animations
○Avoid large layout shifts
95

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.field > span.field-item-single > div.ds-1col > button.toggle-icon div.field > span.field-item-single > div.ds-1col > button.toggle-icon
div.field > span.field-item-single > div.ds-1col > button.toggle-icon div.field > span.field-item-single > div.ds-1col > button.toggle-icon
div.field > span.field-item-single > div.ds-1col > button.toggle-icon div.field > span.field-item-single > div.ds-1col > button.toggle-icon

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.

○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
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Image elements have `[alt]` attributes
●Input buttons have discernible text.
●`[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
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
○`[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 type="image">` elements have `[alt]` text
○Form elements have associated labels
○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.
○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.
○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

User Experience

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.

URLDisplayed sizeActual sizeExpected size
Oxford's women claim victory in the 2026 Boat Race div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_listing/s3/field/field_imag...412 x 247370 x 222618 x 371
Artistic illustration depicting an ocean between 554 and 539 million years ago.… div.link-block-bgimage-wrapper > div.field > span.field-item-single > img
/sites/files/oxford/styles/ow_listing/s3/field/field_imag...412 x 247370 x 222618 x 371

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
sjs.bizographics.com/insight.min.js
Topics
sjs.bizographics.com/insight.min.js
●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
●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
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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