https://dur.ac.uk
Lighthouse Desktop
· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.SCORE
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FIX
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REVIEW
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PASS
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Detailed Report
Audit breakdown by category with detailed findings.
58
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.
Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.
Why this matters
Performance issues directly impact user engagement and conversion rates.
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.286729] map[node:map[boundingRect:map[bottom:646 height:646 left:0 right:1350 top:0 width:1350] lhId:page-27-VIDEO nodeLabel:div.main-content > div.hero-header > div.u-breakout > video.u-absolute path:1,HTML,1,BODY,16,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,2,VIDEO selector:div.main-content > div.hero-header > div.u-breakout > video.u-absolute snippet:<video x-ref="hero-header--video" autoplay="" muted="" playsinline="" preload="auto" class="u-absolute u-pin u-object-cover u-h-full u-w-full u-blend-multiply lazyloa…" loop=""> type:node] score:0.264167] map[node:map[boundingRect:map[bottom:1095 height:449 left:0 right:1350 top:646 width:1350] lhId:page-33-DIV nodeLabel:Find a course
Search
Popular searches:
History
Engineering
Psychology
Geography… path:1,HTML,1,BODY,16,DIV,1,MAIN,0,DIV,2,DIV selector:div.layout-container > main#main-content > div.main-content > div.landing-page-section snippet:<div class="landing-page-section u-breakout u-py-4 md:u-py-6 lg:u-py-10 search-bar-fb"> type:node] score:0.019551] map[node:map[boundingRect:map[bottom:52 height:52 left:481 right:1350 top:0 width:869] lhId:page-28-UL nodeLabel:Alumni
Library and Collections
Business School
Things To Do
About us
How to con… path:1,HTML,1,BODY,16,DIV,0,HEADER,1,DIV,0,DIV,0,DIV,2,DIV,1,UL selector:div.xl:u-absolute > div.u-relative > div.u-flex > ul.u-mb-3 snippet:<ul class="u-mb-3 utility-navigation u-hidden u-relative u-list-reset u-bg-grey-50 u-…" x-data="{ expanded: true }"> type:node] score:0.003011]]
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 |
|---|---|
| fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 | 65 ms |
A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.
Why this matters
Performance issues directly impact user engagement and conversion rates.
headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:2.686 source:map[column:67591 line:1 type:source-location url:https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.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:28.208 source:map[type:text value:[unattributed]]] map[reflowTime:0.149 source:map[column:407 line:0 type:source-location url:https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js urlProvider:network]] map[reflowTime:2.686 source:map[column:69352 line:0 type:source-location url:https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.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.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
A gowned student holding flowers stood outside the teaching and learning centre div.row > div.u-mt-4 > div.u-o-5 > img.img | dur.ac.uk/media/durham-university/homepage/student-blog/Amal-Shetty.png | 1.6 MiB | 1.5 MiB |
Stephenson front of college beautiful spring day div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | /fit-in/800x600/filters:format(webp)/prod01/prodbucket01/... | 202.4 KiB | 194.5 KiB |
A group of students by a river in front of Durham Cathedral div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | /fit-in/800x600/filters:format(webp)/prod01/prodbucket01/... | 145.8 KiB | 138.8 KiB |
A group of four students smiling and chatting. div.col-lg-3 > div.card > div.card__image > img.embed-responsive-item | /fit-in/1280x720/filters:format(webp)/prod01/prodbucket01... | 120.5 KiB | 113.5 KiB |
photo of students sitting in the cafe chatting. div.col-lg-3 > div.card > div.card__image > img.embed-responsive-item | /fit-in/1280x720/filters:format(webp)/prod01/prodbucket01... | 100.5 KiB | 93.8 KiB |
Four students walking and chatting on campus div.col-lg-3 > div.card > div.card__image > img.embed-responsive-item | /fit-in/1280x720/filters:format(webp)/prod01/prodbucket01... | 81.3 KiB | 74.0 KiB |
Student studying in Bill Bryson Library div.col-lg-3 > div.card > div.card__image > img.embed-responsive-item | /fit-in/1280x720/filters:format(webp)/prod01/prodbucket01... | 60.9 KiB | 57.6 KiB |
A hand holding a digitalised version of the globe div.u-o-5 > div.u-relative > picture.image > img.u-w-full | /fit-in/1024x576/filters:format(webp)/prod01/prodbucket01... | 63.9 KiB | 51.5 KiB |
Koi carp banners fluttering in wind div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | /fit-in/800x600/filters:format(webp)/prod01/channel_4/thi... | 49.6 KiB | 44.5 KiB |
Image of galaxy formation simulation from the COLIBRE project div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 37.8 KiB | 29.7 KiB |
A group of female students walk down a cobbled street in the sunshine. Other st… div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 37.3 KiB | 29.3 KiB |
a woman standing in front of a group of people sitting at a table div.col-12 > div.card > div > img.u-absolute | /fit-in/800x450/filters:format(webp)/prod01/prodbucket01/... | 50.5 KiB | 29.2 KiB |
Business students seated at curving desk div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | /fit-in/800x600/filters:format(webp)/prod01/channel_3/bus... | 34.3 KiB | 26.5 KiB |
A national express bus near Edgbaston stadium div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 31.2 KiB | 23.1 KiB |
A woman and a man hold a framed certificate and smile at the camera. The certif… div.col-12 > div.card > div > img.u-absolute | /fit-in/800x450/filters:format(webp)/prod01/prodbucket01/... | 30.7 KiB | 18.3 KiB |
A two-storey Star Home div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 20.5 KiB | 12.4 KiB |
A mixed group of primary school children running in a circle in a playground wi… div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 20.4 KiB | 12.3 KiB |
TIcon of a student holding a book div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | dur.ac.uk/media/durham-university/homepage/UG-Study-Purple-Icon.png | 16.6 KiB | 11.5 KiB |
Young children writing in a classroom div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 18.7 KiB | 10.7 KiB |
A women's volleyball team standing behind a red 'Champions' banner, holding a t… div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 18.6 KiB | 10.5 KiB |
Icon of a student holding a book with a graduation cap on their head div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | /fit-in/768x432/filters:format(webp)/prod01/prodbucket01/... | 12.8 KiB | 10.5 KiB |
Calendar purple icon div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | /fit-in/768x432/filters:format(webp)/prod01/prodbucket01/... | 10.8 KiB | 8.8 KiB |
Speech bubble icon on a purple background div.col-md-6 > div.card > div.card__image > img.embed-responsive-item | /fit-in/768x432/filters:format(webp)/prod01/prodbucket01/... | 10.3 KiB | 8.4 KiB |
leadership chess pawn background div.col-12 > div.card > div > img.u-absolute | /fit-in/800x450/filters:format(webp)/prod01/prodbucket01/... | 19.0 KiB | 7.2 KiB |
A graphic showing a human jaw bone held together by 3D surgical plates. div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 15.2 KiB | 7.1 KiB |
Image of SbmA with its div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 13.9 KiB | 5.8 KiB |
A simulated image of a spiral galaxy with a bright centre and spiral arms, set … div.col-4 > div.card > div.card__image > img.embed-responsive-item | /fit-in/500x281/filters:format(webp)/prod01/prodbucket01/... | 12.4 KiB | 4.3 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-27-VIDEO
nodeLabel: div.main-content > div.hero-header > div.u-breakout > video.u-absolute
path: 1,HTML,1,BODY,16,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,2,VIDEO
selector: div.main-content > div.hero-header > div.u-breakout > video.u-absolute
snippet: <video x-ref="hero-header--video" autoplay="" muted="" playsinline="" preload="auto" class="u-absolute u-pin u-object-cover u-h-full u-w-full u-blend-multiply lazyloa…" loop="">
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.
| URL | Transfer Size | Duration |
|---|---|---|
| /media/durham-university/site-assets/css/durham-style-enh... | 261.4 KiB | 338 ms |
| dur.ac.uk/media/durham-university/site-assets/css/swiper.css | 3.6 KiB | |
| dur.ac.uk/media/durham-university/site-assets/css/perfect-scrollbar.css | 994 B |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
div.main-content > div.hero-header > div.u-breakout > video.u-absolute div.main-content > div.hero-header > div.u-breakout > video.u-absolute | 0.264 |
Find a course
Search
Popular searches:
History
Engineering
Psychology
Geography… div.layout-container > main#main-content > div.main-content > div.landing-page-section | 0.020 |
Alumni
Library and Collections
Business School
Things To Do
About us
How to con… div.xl:u-absolute > div.u-relative > div.u-flex > ul.u-mb-3 | 0.003 |
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: 230 ms 272.2 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /media/durham-university/site-assets/css/durham-style-enh... | 261.1 KiB | 258.5 KiB |
| cdn.curator.io/5.0/curator.embed.css | 14.4 KiB | 13.6 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: 110 ms 907.6 KiB
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Script Evaluation | 1.2 s |
| Other | 552 ms |
| Style & Layout | 198 ms |
| Script Parsing & Compilation | 163 ms |
| Parse HTML & CSS | 78 ms |
| Rendering | 33 ms |
| Garbage Collection | 29 ms |
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 44.3 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /media/durham-university/site-assets/css/durham-style-enh... | 261.4 KiB | 44.3 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.
More information about the performance of your application. These numbers don't directly affect the Performance score.
●Document request latency
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify JavaScript
●User Timing marks and measures 170 user timings
●JavaScript execution time 1.0 s
●Avoid long main-thread tasks 11 long tasks found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 190 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 170 ms
○INP breakdown
○Avoid non-composited animations
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
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
body.body > img body.body > img |
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
●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●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.
●`button`, `link`, and `menuitem` elements have accessible names
●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
●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
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●Identical links have the same purpose.
○`[accesskey]` values are unique
○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 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
○`<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.
○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
○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.
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 / Warning | Source |
|---|---|
| AttributionReporting |
Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30011
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30350
at NodeList.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) | |
TypeError: YT.Player is not a constructor
at Proxy.createYouTubePlayers (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:799)
at Proxy.init (https://dur.ac.uk/media/durham-university/site-assets/js/durham-app-enhanced.js:1:1208)
at eval (eval at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:2981), <anonymous>:3:54)
at saferEval (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:3110)
at Component.evaluateReturnExpression (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:28059)
at new Component (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:22646)
at Object.initializeComponent (https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:31151)
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30975
at https://dur.ac.uk/media/durham-university/site-assets/js/dependencies-20231018.js:1:30554
at Array.forEach (<anonymous>) |
●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
85
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.
Crawling and Indexing
If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Line # | Content | Error |
|---|---|---|
| 49 | Disallow: search.durham.ac.uk/s/resources-global/css/funnelback.autocompletion-2.6.0.css | Pattern should either be empty, start with "/" or "*" |
| 50 | Disallow: search.durham.ac.uk/s/resources-global/thirdparty/typeahead-0.11.1/typeahead.bundle.min.js | Pattern should either be empty, start with "/" or "*" |
| 51 | Disallow: search.durham.ac.uk/s/resources-global/thirdparty/handlebars-4.1/handlebars.min.js | Pattern should either be empty, start with "/" or "*" |
| 52 | Disallow: search.durham.ac.uk/s/resources-global/js/funnelback.autocompletion-2.6.0.js | Pattern should either be empty, start with "/" or "*" |
To appear in search results, crawlers need access to your app.
Content Best Practices
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
body.body > img body.body > img |
Format your HTML in a way that enables crawlers to better understand your app’s content.
○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`