Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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:0.633298] map[node:map[boundingRect:map[bottom:6019 height:5374 left:0 right:412 top:645 width:412] lhId:page-1-DIV nodeLabel:The Scottish Government Pre-election period We are in the pre-election period … path:1,HTML,1,BODY,8,DIV,1,DIV selector:body > div.ds_page > div.ds_page__middle snippet:<div class="ds_page__middle"> type:node] score:0.63305 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:569 height:32 left:16 right:231 top:537 width:215] lhId:page-8-IMG nodeLabel:Scottish Government path:1,HTML,1,BODY,8,DIV,0,DIV,4,HEADER,0,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.ds_site-header__content > div.ds_site-branding > a.ds_site-branding__logo > img.ds_site-branding__logo-image snippet:<img width="269" height="40" class="ds_site-branding__logo-image" alt="Scottish Government" src="/assets/images/logos/scotgovlogo.svg"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:280 height:48 left:16 right:396 top:232 width:380] lhId:page-5-BUTTON nodeLabel:Accept all cookies path:1,HTML,1,BODY,8,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,BUTTON selector:div.ds_wrapper > div.ds_notification__content > div.ds_button-group > button.ds_button snippet:<button class="ds_button ds_button--small ds_button--secondary js-accept-all-cookies" data-button="button-accept-all-cookies" data-banner="banner-cookie-notice-accept-all-cookies"> type:node] score:0.000248 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:569 height:32 left:16 right:231 top:537 width:215] lhId:page-8-IMG nodeLabel:Scottish Government path:1,HTML,1,BODY,8,DIV,0,DIV,4,HEADER,0,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.ds_site-header__content > div.ds_site-branding > a.ds_site-branding__logo > img.ds_site-branding__logo-image snippet:<img width="269" height="40" class="ds_site-branding__logo-image" alt="Scottish Government" src="/assets/images/logos/scotgovlogo.svg"> type:node]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2]]] type:subitems]]]

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

value: No additional origins are good candidates for preconnecting

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
fonts.googleapis.com/css?family=Roboto:100,300,400,700,400italic&display=swap	2.4 KiB	832 ms
maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css	6.5 KiB	814 ms
www.gov.scot/webfiles/1776248299365/assets/scripts/gtm.js	2.2 KiB
www.gov.scot/webfiles/1776248299365/assets/scripts/js-enabled.js	956 B
www.gov.scot/webfiles/1776248299365/assets/scripts/datalayer.js	1.3 KiB
www.gov.scot/webfiles/1776248299365/assets/css/main.css	35.1 KiB	600 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
/binaries/content/gallery/featureditems/council-elections...	300.0 s	113.9 KiB
/binaries/content/gallery/featureditems/costofliving-supp...	300.0 s	12.6 KiB
/binaries/content/gallery/featureditems/bank-holidays-png...	300.0 s	5.1 KiB
www.gov.scot/assets/scripts/vendor/svgxuse.min.js	86400.0 s	3.4 KiB
/assets/scripts/vendor/plausible/script.file-downloads.ou...	86400.0 s	3.2 KiB
www.gov.scot/assets/images/logos/scotgovlogo.svg	86400.0 s	2.4 KiB

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
Pre-election period `div.gov_hero-item__media > a > div.gov_hero-item__figure > img.gov_hero-item__image`	/binaries/content/gallery/featureditems/council-elections...	113.2 KiB	105.6 KiB

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

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: 0.0 ms 31.1 KiB

URL	Transfer Size	Est Savings
www.gov.scot/webfiles/1776248299365/assets/css/main.css	34.3 KiB	31.1 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: 0.0 ms 23.3 KiB

URL	Transfer Size	Est Savings
www.gov.scot/webfiles/1776248299365/assets/scripts/global.js	32.3 KiB	23.3 KiB

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

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
The Scottish Government Pre-election period We are in the pre-election period … `body > div.ds_page > div.ds_page__middle`	0.633
Accept all cookies `div.ds_wrapper > div.ds_notification__content > div.ds_button-group > button.ds_button`	0.000

●Time to Interactive 2.0 s

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 30 ms

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 287 KiB

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.6 s

●Avoid long main-thread tasks 1 long task found

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 40 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 10 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

Some ARIA roles have required attributes that describe the state of the element to screen readers. Learn more about roles and required attributes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Information `div#important-banner > div.ds_wrapper > div.ds_notification__content > div.visually-hidden`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

○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]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[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 are distinguishable without relying on color.

●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

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

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

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

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

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

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○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.

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

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

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`