Lighthouse Desktop

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
/2026-03/professional_photo-liu_haibo.jpg?VersionId=0EJqh...	0.0 ms	14.7 MiB
/2026-04/adobestock_1052088146.jpeg?VersionId=zxk3C36Ycua...	0.0 ms	5.9 MiB
/2026-03/photo_additional_uma_1.jpg?VersionId=3Obx0Zf384u...	0.0 ms	1.4 MiB
/2026-04/robots.jpg?VersionId=A_wdWqQj8.BfS1y0Gv7aVCsNLC0...	0.0 ms	713.9 KiB
/sites/default/files/js/js_Grfmv-5CNuzze62geIH5mnA8ZbV79-...	0.0 ms	62.9 KiB
/sites/default/files/js/js_V8xutc9hhgLgmFSIbTZQgFS9UbxQIM...	0.0 ms	54.7 KiB
/sites/default/files/css/css_At70hQY3ILLIA-4BhSxL85Yn6TPo...	0.0 ms	40.7 KiB
/sites/default/files/js/js_2g2mk58gC-hC2ZmNgiVSVjoJSdmset...	0.0 ms	33.6 KiB
service.mtcaptcha.com/mtcv1/client/mtcaptcha2.min.js	10.0 s	27.7 KiB
service.mtcaptcha.com/mtcv1/client/mtcaptcha.min.js	10.0 s	27.6 KiB
ruby.ops.iec.ch/matomo.js	0.0 ms	22.0 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
/sites/default/files/css/css_PGKoLtvegk5RZCalkMk44iYJiq6j...	0.0 ms	8.9 KiB
/sites/default/files/js/js_ySqz9Cpe0HnRCfdX5b0QYJhxQbF_M8...	0.0 ms	8.8 KiB
/sites/default/files/js/js_J1kGqRCVz4jsj90bkXYtYg3tQBxeFY...	0.0 ms	8.4 KiB
player.vimeo.com/api/player.js	1800.0 s	9.0 KiB
iec.ch/themes/custom/iec/images/IEC_logo.jpg	259200.0 s	24.2 KiB
/sites/default/files/css/css_4QdgEWPozTelkx6Z1MTZ1AQlOmMA...	0.0 ms	4.5 KiB
iec.ch/themes/custom/iec/images/iec-logo-mobile.svg	0.0 ms	2.4 KiB
/modules/contrib/eu_cookie_compliance/js/eu_cookie_compli...	259200.0 s	7.3 KiB
iec.ch/themes/custom/iec/images/arrow-right-simple-line-icons.png	259200.0 s	7.2 KiB

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.w...	70 ms
unpkg.com/ionicons@4.4.2/dist/fonts/ionicons.woff2?v=4.4.1	65 ms
use.fontawesome.com/releases/v5.5.0/webfonts/fa-brands-400.woff2	45 ms
use.fontawesome.com/releases/v5.5.0/webfonts/fa-solid-900.woff2	40 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:62.416 source:map[type:text value:[unattributed]]]]

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-0-DIV

nodeLabel: Shaping the future of standards Explore tools for inclusive standards and parti…

path: 1,HTML,1,BODY,2,DIV,1,DIV,0,DIV,0,SECTION,2,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,A,0,DIV,0,DIV

selector: div.col > a > div.paragraph > div.wrapper

snippet: <div class="wrapper" style="background-image: url("/system/files/styles/original_image/private/2026-03/i…");">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

title: Preconnected origins

value: no origins were preconnected

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

title: Preconnect candidates

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/css?family=Roboto:300,300i,400,400i,500,500i,700,700i\|Ro...	3.9 KiB	285 ms
use.fontawesome.com/releases/v5.5.0/css/v4-shims.css	4.6 KiB	57 ms
use.fontawesome.com/releases/v5.5.0/css/all.css	12.1 KiB	313 ms
/sites/default/files/css/css_At70hQY3ILLIA-4BhSxL85Yn6TPo...	40.7 KiB	212 ms
cdn.datatables.net/buttons/2.2.2/css/buttons.dataTables.min.css	2.7 KiB	57 ms
cdn.datatables.net/rowgroup/1.2.0/css/rowGroup.bootstrap.min.css	492 B
cdn.datatables.net/1.11.5/css/jquery.dataTables.min.css	2.6 KiB	259 ms
unpkg.com/ionicons@4.4.2/dist/css/ionicons.min.css	8.2 KiB	274 ms
/sites/default/files/js/js_2g2mk58gC-hC2ZmNgiVSVjoJSdmset...	33.6 KiB	85 ms
/sites/default/files/css/css_4QdgEWPozTelkx6Z1MTZ1AQlOmMA...	4.5 KiB
/sites/default/files/css/css_PGKoLtvegk5RZCalkMk44iYJiq6j...	8.9 KiB	85 ms
cdn.jsdelivr.net/npm/bootstrap@3.4.1/dist/css/bootstrap.min.css	17.9 KiB	284 ms
/npm/@unicorn-fail/drupal-bootstrap-styles@0.0.2/dist/3.4...	3.6 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
Energy `a > div.paragraph > div.iec-slide-item-title > div.field`	/2026-03/professional_photo-liu_haibo.jpg?VersionId=0EJqh...	14.7 MiB	11.2 MiB
0 `div.field--item > div.paragraph > div.iec-statistics-block-item-container > h1#iec-count-up-1905772950`	/2026-04/adobestock_1052088146.jpeg?VersionId=zxk3C36Ycua...	5.9 MiB	732.9 KiB
Home `div#navbar-collapse > div.region > a.hidden-xs > img`	iec.ch/themes/custom/iec/images/IEC_logo.jpg	22.7 KiB	20.5 KiB
subscribe `div.field > p.text-align-center > a > img`	iec.ch/system/files/inline-images/subscribe_darkblue.png	6.2 KiB	5.1 KiB

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 275 ms

URL	Time Spent
iec.ch/	275 ms
iec.ch/	0.0 ms
iec.ch/homepage	0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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 63.2 KiB

URL	Transfer Size	Est Savings
/sites/default/files/css/css_At70hQY3ILLIA-4BhSxL85Yn6TPo...	38.9 KiB	35.6 KiB
cdn.jsdelivr.net/npm/bootstrap@3.4.1/dist/css/bootstrap.min.css	17.5 KiB	16.1 KiB
use.fontawesome.com/releases/v5.5.0/css/all.css	11.6 KiB	11.5 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: 450 ms 552.9 KiB

URL	Transfer Size	Est Savings
/1f953c479d22/474d1bb585aa/141fa6216ac8/challenge.js	575.3 KiB	314.0 KiB
www.googletagmanager.com/gtag/js?id=G-3F71XQS4K3	157.4 KiB	65.7 KiB
www.googletagmanager.com/gtag/js?id=UA-34398331-1	124.9 KiB	64.5 KiB
/sites/default/files/js/js_Grfmv-5CNuzze62geIH5mnA8ZbV79-...	61.0 KiB	43.9 KiB
/sites/default/files/js/js_V8xutc9hhgLgmFSIbTZQgFS9UbxQIM...	52.9 KiB	41.2 KiB
cdn.datatables.net/1.11.5/js/jquery.dataTables.min.js	28.4 KiB	23.6 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in a sub frame.	Actionable

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/2026-03/professional_photo-liu_haibo.jpg?VersionId=0EJqh...	14.7 MiB
/2026-04/adobestock_1052088146.jpeg?VersionId=zxk3C36Ycua...	5.9 MiB
/2026-03/photo_additional_uma_1.jpg?VersionId=3Obx0Zf384u...	1.4 MiB
/2026-04/robots.jpg?VersionId=A_wdWqQj8.BfS1y0Gv7aVCsNLC0...	713.9 KiB
/1f953c479d22/474d1bb585aa/141fa6216ac8/challenge.js	575.7 KiB
/system/files/styles/original_image/private/2026-03/inclu...	236.1 KiB
www.googletagmanager.com/gtag/js?id=G-3F71XQS4K3	157.4 KiB
/system/files/styles/original_image/private/2024-04/strat...	130.0 KiB
www.googletagmanager.com/gtag/js?id=UA-34398331-1	125.2 KiB
/system/files/styles/original_image/private/2026-01/iec_k...	83.2 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
Home `div#navbar-collapse > div.region > a.hidden-xs > img`	iec.ch/themes/custom/iec/images/IEC_logo.jpg
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
icon `a > div.paragraph > div.iec-slide-item-img-wrap > img.iec-slide-item-img`
logo `div.iec-for-all-item-container > div.iec-for-all-item-flex-item > div.iec-for-all-item-img > img.b-lazy`
logo `div.iec-for-all-item-container > div.iec-for-all-item-flex-item > div.iec-for-all-item-img > img.b-lazy`
logo `div.iec-for-all-item-container > div.iec-for-all-item-flex-item > div.iec-for-all-item-img > img.b-lazy`
logo `div.iec-for-all-item-container > div.iec-for-all-item-flex-item > div.iec-for-all-item-img > img.b-lazy`

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

●Max Potential First Input Delay 100 ms

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.3 s

●Minimizes main-thread work 0.8 s

●Avoid long main-thread tasks 2 long tasks found

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 90 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 80 ms

●Avoid large layout shifts 10 layout shifts found

○INP breakdown

○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 parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Energy SDGs Climate action Smart manufacturing Healthcare Cities & Communities … `div.container > div.iec-grid-icon-slider-wrapper > div#grid-icon-slider-497932334 > div.carousel-inner`
Read more Read more Read more Read more Read more `div.container > div.iec-white-papers-slider-wrapper > div#grid-icon-slider-2109212649 > div.carousel-inner`
Read more Read more Read more Read more Read more `div.container > div.iec-white-papers-slider-wrapper > div#grid-icon-slider-2134488651 > div.carousel-inner`

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
We use cookies on this site to enhance your user experience By clicking the Ac… `body.path-node > div#sliding-popup`

When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Energy SDGs Climate action Smart manufacturing Healthcare Cities & Communities … `div.container > div.iec-grid-icon-slider-wrapper > div#grid-icon-slider-497932334 > div.carousel-inner`
Read more Read more Read more Read more Read more `div.container > div.iec-white-papers-slider-wrapper > div#grid-icon-slider-2109212649 > div.carousel-inner`
Read more Read more Read more Read more Read more `div.container > div.iec-white-papers-slider-wrapper > div#grid-icon-slider-2134488651 > div.carousel-inner`

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.

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
Advanced search `ul.menu > li.first > a > span.link-text`
Webstore `ul.menu > li > a > span.link-text`
IEC PSP `nav#block-topmenu--2 > ul.menu > li > a`
e-tech `nav#block-topmenu--2 > ul.menu > li > a`
Online learning `nav#block-topmenu--2 > ul.menu > li > a`
Contact us `nav#block-topmenu--2 > ul.menu > li.last > a`
A global network that covers 99% of the world population and offers a free prog… `div.iec-statistics-block-item-container > div.hidden-xs > div.field > p`
Develops international standards that represent a global concensus of state-of-… `div.iec-statistics-block-item-container > div.hidden-xs > div.field > p`
Four Conformity Assessment Systems that cover the breadth of electrical and ele… `div.iec-statistics-block-item-container > div.hidden-xs > div.field > p`
Over 30 000 experts and more than 100 years expertise `div.iec-statistics-block-item-container > div.hidden-xs > div.field > p`
Past two weeks list `section#single-element-text-7837 > div.text-link-container > div.item-link > a.hvr-icon-forward`
Final Draft International Standards `div.text-block-content > div.field > p > a`
See details `section#single-element-text-7839 > div.text-link-container > div.item-link > a.hvr-icon-forward`
Visit here `section#single-element-text-3592 > div.text-link-container > div.item-link > a.hvr-icon-forward`
Energy `a > div.paragraph > div.iec-slide-item-title > div.field`
SDGs `a > div.paragraph > div.iec-slide-item-title > div.field`
Climate action `a > div.paragraph > div.iec-slide-item-title > div.field`
Smart manufacturing `a > div.paragraph > div.iec-slide-item-title > div.field`
Healthcare `a > div.paragraph > div.iec-slide-item-title > div.field`
Cities & Communities `a > div.paragraph > div.iec-slide-item-title > div.field`
Cyber security `a > div.paragraph > div.iec-slide-item-title > div.field`
Transportation `a > div.paragraph > div.iec-slide-item-title > div.field`
Industry `a > div.iec-for-all-item-container > div.iec-for-all-item-flex-item > p.iec-for-all-item-title`
Government and regulators `a > div.iec-for-all-item-container > div.iec-for-all-item-flex-item > p.iec-for-all-item-title`
Developing countries `a > div.iec-for-all-item-container > div.iec-for-all-item-flex-item > p.iec-for-all-item-title`
Academia `a > div.iec-for-all-item-container > div.iec-for-all-item-flex-item > p.iec-for-all-item-title`
Please select the services that are of interest to you, and stay up to date wit… `div.cs-container > div.iec-block-container > div.col-sm-12 > h2.block-subtitle`
Details about our newsletters `div.iec-block-container > div.block-readmore > div.field > a`

These are opportunities to improve the legibility of your content.

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.text-block-content > div.field > p > iframe.fw-iframe `div.text-block-content > div.field > p > iframe.fw-iframe`
div.text-block-content > div.field > p > iframe.fw-iframe `div.text-block-content > div.field > p > iframe.fw-iframe`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.row > div.iec-white-papers-slider-item > article.document > a `div.row > div.iec-white-papers-slider-item > article.document > a`
div.paragraph > ul.social-media-links--platforms > li > a.iec-facebook `div.paragraph > ul.social-media-links--platforms > li > a.iec-facebook`
div.paragraph > ul.social-media-links--platforms > li > a.iec-linkedin `div.paragraph > ul.social-media-links--platforms > li > a.iec-linkedin`
div.paragraph > ul.social-media-links--platforms > li > a.iec-youtube_channel `div.paragraph > ul.social-media-links--platforms > li > a.iec-youtube_channel`

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.

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
countries `div.field--item > div.paragraph > div.iec-statistics-block-item-container > h3.iec-statistics-block-item-title`
standards `div.field--item > div.paragraph > div.iec-statistics-block-item-container > h3.iec-statistics-block-item-title`
certificates `div.field--item > div.paragraph > div.iec-statistics-block-item-container > h3.iec-statistics-block-item-title`
experts `div.field--item > div.paragraph > div.iec-statistics-block-item-container > h3.iec-statistics-block-item-title`

These are opportunities to improve keyboard navigation in your application.

○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

●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

●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.

●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.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○ARIA `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

○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.

○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

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
iec.ch/basecamp/medium-voltage-dc-mvdc-grids-all-electric-society	Read more
/basecamp/virtualizing-power-systems-how-digital-twins-wi...	Read more
iec.ch/basecamp/industrial-metaverse	Read more
/basecamp/artificial-intelligence-generated-content-aigc-...	Read more
/basecamp/relay-protection-power-electronics-dominated-po...	Read more
iec.ch/basecamp/medium-voltage-dc-mvdc-grids-all-electric-society	Read more
/basecamp/virtualizing-power-systems-how-digital-twins-wi...	Read more
iec.ch/basecamp/industrial-metaverse	Read more
/basecamp/artificial-intelligence-generated-content-aigc-...	Read more
/basecamp/relay-protection-power-electronics-dominated-po...	Read more
iec.ch/basecamp/welcome-iec	Read more
iec.ch/basecamp/environmentally-conscious-design	Read more
iec.ch/basecamp/restrictedhazardous-substance-process-management	Read more
iec.ch/basecamp/carbon-footprint-product-claims-verification	Read more
iec.ch/basecamp/digital-transformation	Read more
iec.ch/basecamp/welcome-iec	Read more
iec.ch/basecamp/environmentally-conscious-design	Read more
iec.ch/basecamp/restrictedhazardous-substance-process-management	Read more
iec.ch/basecamp/carbon-footprint-product-claims-verification	Read more
iec.ch/basecamp/digital-transformation	Read more
iec.ch/node/40319	More info

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

Crawling and Indexing

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div.region > div.visible-xs-block > div.iec-top-menu-container > a.iec-mobile-top-menu-item `div.region > div.visible-xs-block > div.iec-top-menu-container > a.iec-mobile-top-menu-item`

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid