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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.

6

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.

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:0.801349] map[node:map[boundingRect:map[bottom:14252 height:324 left:298 right:568 top:13928 width:270] lhId:page-2-DIV nodeLabel:Download the BBC app Click here to download the BBC app for Apple and Android … path:1,HTML,1,BODY,0,DIV,0,DIV,10,MAIN,0,ARTICLE,22,SECTION,0,DIV,1,DIV,0,DIV,1,DIV selector:div.sc-137e23a3-2 > div.sc-c64a065b-0 > div.sc-c64a065b-1 > div.sc-c64a065b-2 snippet:<div class="sc-c64a065b-2 fiRPhe"> type:node] score:0.710083 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:15953 height:15953 left:0 right:412 top:0 width:412] lhId:page-13-HTML nodeLabel:html path:1,HTML selector:html snippet:<html lang="en-GB"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:14252 height:324 left:298 right:568 top:13928 width:270] lhId:page-2-DIV nodeLabel:Download the BBC app Click here to download the BBC app for Apple and Android … path:1,HTML,1,BODY,0,DIV,0,DIV,10,MAIN,0,ARTICLE,22,SECTION,0,DIV,1,DIV,0,DIV,1,DIV selector:div.sc-137e23a3-2 > div.sc-c64a065b-0 > div.sc-c64a065b-1 > div.sc-c64a065b-2 snippet:<div class="sc-c64a065b-2 fiRPhe"> type:node] score:0.053519 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:15953 height:15953 left:0 right:412 top:0 width:412] lhId:page-13-HTML nodeLabel:html path:1,HTML selector:html snippet:<html lang="en-GB"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:14252 height:324 left:298 right:568 top:13928 width:270] lhId:page-2-DIV nodeLabel:Download the BBC app Click here to download the BBC app for Apple and Android … path:1,HTML,1,BODY,0,DIV,0,DIV,10,MAIN,0,ARTICLE,22,SECTION,0,DIV,1,DIV,0,DIV,1,DIV selector:div.sc-137e23a3-2 > div.sc-c64a065b-0 > div.sc-c64a065b-1 > div.sc-c64a065b-2 snippet:<div class="sc-c64a065b-2 fiRPhe"> type:node] score:0.037747 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:15953 height:15953 left:0 right:412 top:0 width:412] lhId:page-13-HTML nodeLabel:html path:1,HTML selector:html snippet:<html lang="en-GB"> type:node]]] type:subitems]]]

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:77.761 source:map[type:text value:[unattributed]]]]

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
In pictures: Artemis II crew witness 'Earthset' and a solar eclipse div.sc-329e5f2b-3 > div.sc-329e5f2b-4 > div.sc-5340b511-1 > img.sc-5340b511-0
ichef.bbc.co.uk/images/ic/raw/p0nc0nkl.jpg?v=4&desktop-default.webp123.6 KiB121.4 KiB
Iranian workers cleans at the site of Israeli-American strikes that according t… div.sc-d8331fdf-5 > div.sc-d8331fdf-1 > div.sc-5340b511-1 > img.sc-5340b511-0
/ace/standard/800/cpsprodpb/1fc5/live/f8900750-32a4-11f1-...69.7 KiB22.1 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-1-IMG
nodeLabel: Iranian workers cleans at the site of Israeli-American strikes that according t…
path: 1,HTML,1,BODY,0,DIV,0,DIV,10,MAIN,0,ARTICLE,1,SECTION,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG
selector: div.sc-d8331fdf-5 > div.sc-d8331fdf-1 > div.sc-5340b511-1 > img.sc-5340b511-0
snippet: <img sizes="(min-width: 1008px) 33vw, (min-width: 600px) 66vw, 100vw" srcset="https://ichef.bbci.co.uk/ace/standard/240/cpsprodpb/1fc5/live/f8900750-32a…" src="https://ichef.bbci.co.uk/ace/standard/800/cpsprodpb/1fc5/live/f8900750-32a…" loading="eager" alt="Iranian workers cleans at the site of Israeli-American strikes that accord…" class="sc-5340b511-0 hLdNfA">

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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.
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
value: No additional origins are good candidates for preconnecting

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

Lists the toplevel main thread tasks that executed during page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Collection of useful page vitals.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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: 7.0 s
URLTime Spent
www.bbc.co.uk/7.0 s
www.bbc.com/0.0 ms

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.

ElementLayout shift score
Download the BBC app Click here to download the BBC app for Apple and Android … div.sc-137e23a3-2 > div.sc-c64a065b-0 > div.sc-c64a065b-1 > div.sc-c64a065b-2
0.710
Download the BBC app Click here to download the BBC app for Apple and Android … div.sc-137e23a3-2 > div.sc-c64a065b-0 > div.sc-c64a065b-1 > div.sc-c64a065b-2
0.054
Download the BBC app Click here to download the BBC app for Apple and Android … div.sc-137e23a3-2 > div.sc-c64a065b-0 > div.sc-c64a065b-1 > div.sc-c64a065b-2
0.038

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

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.

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.

Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay. Learn how to avoid long main-thread tasks

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

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.

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 2.1 KiB

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
Render blocking requests
Optimize viewport for mobile
Reduce unused CSS
User Timing marks and measures 10 user timings
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 60 ms
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 0 ms
INP breakdown
Avoid non-composited animations
86

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.sc-643c51a4-1 > div.sc-643c51a4-6 > div.sc-5248fb9c-9 > button.sc-5248fb9c-0 div.sc-643c51a4-1 > div.sc-643c51a4-6 > div.sc-5248fb9c-9 > button.sc-5248fb9c-0

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Artemis II's historic lunar flyby... in 90 seconds div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
The four astronauts in the Orion spacecraft set a new record for distance trave… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
US & Canada div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > div.sc-1907e52a-0 > span.sc-1907e52a-2
What do people think of Kanye West being blocked from entering the UK? div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
This summer's Wireless Festival has been cancelled after headliner Kanye West w… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
The mysterious origins of the temple older than Stonehenge div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
Göbekli Tepe, an 11,500‑year‑old temple, offers clues to humanity's first steps… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
Humans div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > div.sc-1907e52a-0 > span.sc-1907e52a-2
Artemis II mission loses contact with Earth for 40 minutes div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
Once contact was regained, astronaut Christina Koch said: "It is so great to he… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
US & Canada div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > div.sc-1907e52a-0 > span.sc-1907e52a-2
Emotional crew names Moon crater after commander's late wife div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
Artemis II Commander Reid Wiseman's wife died from cancer in 2020 at age 46. a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
US & Canada div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > div.sc-1907e52a-0 > span.sc-1907e52a-2
Moment Artemis II sets record for distance humans have travelled from Earth div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
The crew broke a previous record of 248,655 miles (400,171km) set by the Apollo… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
US & Canada div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > div.sc-1907e52a-0 > span.sc-1907e52a-2
Inside the hotel where Agatha Christie wrote a classic div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
The BBC visits the luxury hotel in Istanbul where Agatha Christie wrote Murder … a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
The Travel Show div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > div.sc-1907e52a-0 > span.sc-1907e52a-2
'We are at the edge of a battlefield': BBC reports near Strait of Hormuz div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
The BBC's Orla Guerin travels to the edge of the critical waterway that Iran ha… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
Middle East div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > div.sc-1907e52a-0 > span.sc-1907e52a-2
US Politics Unspun div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
No noise. No agenda. Just expert analysis of the issues that matter most from A… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
Download the BBC app div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
Click here to download the BBC app for Apple and Android devices. a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
Sign up to World of Business div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
Gain the leading edge with global insights for the boardroom and beyond, in you… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
Register for a BBC account div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
Don't have time to read everything right now? Your BBC account lets you save ar… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4
Sign up for the Essential List div.sc-8a86ca4a-3 > div.sc-feaf8701-1 > div.sc-feaf8701-0 > h2.sc-feaf8701-3
The week's best stories, handpicked by BBC editors, in your inbox every Tuesday… a.sc-8a623a54-0 > div.sc-8a86ca4a-0 > div.sc-8a86ca4a-3 > p.sc-8a86ca4a-4

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
cookies div#bbccookies-prompt > div.orb-banner-content > p > a

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Iranians form human chains at bridges and power plants div > a.sc-8a623a54-0 > div.sc-47f19540-0 > h4.sc-47f19540-1
Why Real Madrid tie could make or break Kane's Ballon d'Or hopes div > a.sc-8a623a54-0 > div.sc-47f19540-0 > h4.sc-47f19540-1

These are opportunities to improve keyboard navigation in your application.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
The Global Story The medications that can trigger sex and gambling addictions div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Global News Podcast Artemis II astronauts fly around the Moon div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Global News Podcast Trump warns Iran 'whole civilisation will die tonight' div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Outlook I found the singer the world forgot div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Business Daily Headspace CEO on the use of AI in tackling burnout div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Witness History Marcel Duchamp and the urinal that changed art div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
The Documentary Podcast Albania: Land, money and the sea div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Global News Podcast Intelligence chief of Iranian Revolutionary Guard killed div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Outlook The addict turned priest who fought the 'war on drugs' div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
The Global Story Why Hungary’s chaotic election matters to Trump div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
BBC Women's Football Weekly Extra: Scotland head coach Mel Andreatta with Jen! div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
More than the Score Paris-Roubaix: cycling’s ‘hell of the north’ div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Football Daily MNC: Arsenal's slump and can Slot turn Liverpool around? div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Rugby Union Weekly Quarter-finals, TMO controversy & rugby's GOAT div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
BBC Women's Football Weekly Extra: The WSL 2 & race for promotion div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
More than the Score How do you teach the World's Strongest Man to dance? div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
The Wayne Rooney Show Wayne Rooney Reveals His Top 5 Greatest Sports Stars Ever div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
Football Daily FA Cup Review: Shocks, thrillers and hammerings div.sc-225578b-0 > div.sc-d2483551-4 > div > a.sc-8a623a54-0
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
`[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
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
Touch targets have sufficient size and spacing.
Skip links are focusable.
Document has a main landmark.
Deprecated ARIA roles were not used
Image elements do not have `[alt]` attributes that are redundant text.
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
`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
Input buttons have discernible text.
`<input type="image">` elements have `[alt]` text
Form elements have associated labels
The document does not use `<meta http-equiv="refresh">`
`<object>` elements have alternate text
Select elements have associated label elements.
No element has a `[tabindex]` value greater than 0
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
`[lang]` attributes have a valid value
`<video>` elements contain a `<track>` element with `[kind="captions"]`
Tables have different content in the summary attribute and `<caption>`.
All heading elements contain content.
Uses ARIA roles only on compatible elements
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.
100

Best Practices

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
Displays images with correct aspect ratio
Serves images with appropriate resolution
Page has the HTML doctype
Properly defines charset
No browser errors logged to the console
No issues in the `Issues` panel in Chrome Devtools
Ensure CSP is effective against XSS attacks
Use a strong HSTS policy
Ensure proper origin isolation with COOP
Mitigate 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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