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
/transform/50d0992c-d81b-457b-8851-ad85eece8539/Shutterst...	900.0 s	287.6 KiB
/transform/0b4bb7e6-6e96-48bc-8417-95e19aaa8aa9/shutterst...	900.0 s	140.5 KiB
/-/jssmedia/global/images/about-us/careers-new.jpg?h=724&...	14400.0 s	181.5 KiB
/-/jssmedia/global/images/resource-centre/case-study/aai-...	14400.0 s	168.0 KiB
assets.adobedtm.com/aa8d49dd9ad8/c60f8008e9db/launch-73985aff2ccb.min.js	3600.0 s	113.4 KiB
/transform/87942ca4-e449-48a0-9ce4-0a7a2cd90a2a/shutterst...	900.0 s	93.1 KiB
/transform/f53ec91e-b74e-4794-80a6-accf4bf8268e/GettyImag...	900.0 s	90.9 KiB
madc.tuvsud.com/transform/26d69b5d-05e7-446a-baec-31f661b34333/Power-Station	900.0 s	63.0 KiB
madc.tuvsud.com/transform/6cfd34bb-14ab-46d0-ac77-5965cd4bee55/Shopping-Cart	900.0 s	60.9 KiB
/transform/36b9465d-b0b7-41d5-9132-de23a8aae1f9/Factory-I...	900.0 s	59.7 KiB
madc.tuvsud.com/transform/db4b9873-cf0f-4eec-a6a9-3cca45d4afe7/Car	900.0 s	56.4 KiB
madc.tuvsud.com/transform/d0180c33-2621-4b32-925f-2b8bb6564219/Medical-device	900.0 s	52.6 KiB
madc.tuvsud.com/transform/407a7998-cae3-4359-8641-13eea98a0a78/Manufacturing	900.0 s	44.5 KiB
www.tuvsud.com/weoassets/fonts/TUVSUDPro/TUVSUDPro-Bold.woff2	14400.0 s	57.4 KiB
www.tuvsud.com/weoassets/fonts/TUVSUDPro/TUVSUDPro-Regular.woff2	14400.0 s	53.9 KiB
madc.tuvsud.com/transform/635c6aee-3b91-42bc-9ef4-0f2be0cc5af6/Complete-railway	900.0 s	39.8 KiB
www.tuvsud.com/weoassets/fonts/TUVSUDPro/TUVSUDPro-Medium.woff2	14400.0 s	45.3 KiB
madc.tuvsud.com/transform/8702b464-93e1-4763-862c-27bbccf578b5/Real-Estate	900.0 s	32.6 KiB
/-/jssmedia/global/images/about-us/annual-report-pictogra...	14400.0 s	24.4 KiB
/-/jssmedia/global/images/resource-centre/webinar/as-8688...	14400.0 s	23.8 KiB
www.tuvsud.com/weoassets/images/varianticons/language-white-icon.svg	14400.0 s	1.7 KiB
www.tuvsud.com/weoassets/images/logos/logo.svg	14400.0 s	1.4 KiB
www.tuvsud.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	2871.0 s	726 B
www.tuvsud.com/weoassets/images/icons/emailicons.svg	14400.0 s	849 B
www.tuvsud.com/weoassets/images/icons/search.svg	14400.0 s	806 B
www.tuvsud.com/weoassets/images/imagewithcontent/chevronleft.svg	14400.0 s	565 B
www.tuvsud.com/weoassets/images/imagewithcontent/chevronright.svg	14400.0 s	508 B
www.tuvsud.com/weoassets/images/varianticons/cancel-white.svg	14400.0 s	498 B
www.tuvsud.com/weoassets/images/icons/upperarrow.svg	14400.0 s	479 B
www.tuvsud.com/weoassets/images/simplified/rigtharrow.svg	14400.0 s	478 B
www.tuvsud.com/weoassets/images/icons/arrowforward.svg	14400.0 s	478 B
www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg	14400.0 s	466 B
www.tuvsud.com/weoassets/images/imagewithcontent/black-arrow.svg	14400.0 s	420 B
/m/53f129f37ff89c51/original/-English-Subtitles-TUV-SUD-C...	900.0 s	0 B
/m/53f129f37ff89c51/original/-English-Subtitles-TUV-SUD-C...	900.0 s	0 B

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
www.tuvsud.com/_next/static/media/slick.653a4cbb.woff	30 ms

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
African worker is gathering coffee beans on plantation in bushy wood `div.teaser-banner__wrapper > div.banner-image > picture > img`	/transform/50d0992c-d81b-457b-8851-ad85eece8539/Shutterst...	286.7 KiB	169.4 KiB
Case study AAI `article.slider__card-item > div > div.slider__card-item__wrapper > img.highlights-card__image`	/-/jssmedia/global/images/resource-centre/case-study/aai-...	167.5 KiB	163.6 KiB
ESG icon concept circulating in hands for environment, society and governance. … `article.slider__card-item > div > div.slider__card-item__wrapper > img.highlights-card__image`	/transform/0b4bb7e6-6e96-48bc-8417-95e19aaa8aa9/shutterst...	139.7 KiB	137.6 KiB
2025 growth business. wooden block with 2024 change to 2025, Set up objective t… `article.slider__card-item > div > div.slider__card-item__wrapper > img.highlights-card__image`	/transform/87942ca4-e449-48a0-9ce4-0a7a2cd90a2a/shutterst...	92.3 KiB	90.7 KiB
Two happy engineers in high visibility vests taking a selfie in a field with a … `div.homepage-hero-banner__item > div.homepage-hero-banner__item-block > div.homepage-hero-banner__item-block__image > img`	/transform/f53ec91e-b74e-4794-80a6-accf4bf8268e/GettyImag...	90.2 KiB	82.7 KiB
careers `div.teaser-banner__wrapper > div.banner-image > picture > img`	/-/jssmedia/global/images/about-us/careers-new.jpg?h=724&...	181.0 KiB	74.7 KiB
Power Station `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	madc.tuvsud.com/transform/26d69b5d-05e7-446a-baec-31f661b34333/Power-Station	62.4 KiB	62.3 KiB
Pictogram in .SVG for Shopping Cart `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	madc.tuvsud.com/transform/6cfd34bb-14ab-46d0-ac77-5965cd4bee55/Shopping-Cart	60.2 KiB	60.2 KiB
Factory Inspection `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	/transform/36b9465d-b0b7-41d5-9132-de23a8aae1f9/Factory-I...	59.1 KiB	59.0 KiB
Pictogram in .SVG for Car `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	madc.tuvsud.com/transform/db4b9873-cf0f-4eec-a6a9-3cca45d4afe7/Car	55.8 KiB	55.8 KiB
Pictogram in .SVG for Medical device `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	madc.tuvsud.com/transform/d0180c33-2621-4b32-925f-2b8bb6564219/Medical-device	51.9 KiB	51.9 KiB
Manufacturing `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	madc.tuvsud.com/transform/407a7998-cae3-4359-8641-13eea98a0a78/Manufacturing	43.9 KiB	43.8 KiB
Rail front `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	madc.tuvsud.com/transform/635c6aee-3b91-42bc-9ef4-0f2be0cc5af6/Complete-railway	39.1 KiB	39.1 KiB
Real Estate `article.teaser-tile-tag-and-filter__item > div.pictogram-title > span.sc-image-wrapper > img.image-pictogram`	madc.tuvsud.com/transform/8702b464-93e1-4763-862c-27bbccf578b5/Real-Estate	32.0 KiB	32.0 KiB
Cotton traceability in textile supply chain `article.slider__card-item > div > div.slider__card-item__wrapper > img.highlights-card__image`	/-/jssmedia/global/images/resource-centre/webinar/as-8688...	23.3 KiB	17.0 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-4-IMG

nodeLabel: Two happy engineers in high visibility vests taking a selfie in a field with a …

path: 1,HTML,1,BODY,0,DIV,0,DIV,4,MAIN,0,SECTION,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,IMG

selector: div.homepage-hero-banner__item > div.homepage-hero-banner__item-block > div.homepage-hero-banner__item-block__image > img

snippet: <img alt="Two happy engineers in high visibility vests taking a selfie in a field wi…" loading="eager" width="2500" height="1667" decoding="async" data-nimg="1" style="color:transparent" srcset="https://madc.tuvsud.com/transform/f53ec91e-b74e-4794-80a6-accf4bf8268e/Get…" src="https://madc.tuvsud.com/transform/f53ec91e-b74e-4794-80a6-accf4bf8268e/Get…">

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

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
cdn.cookielaw.org/scripttemplates/otSDKStub.js	0 B	230 ms

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: 110 ms 98.9 KiB

URL	Transfer Size	Est Savings
www.tuvsud.com/_next/static/css/c416a00b0876ef27.css	105.2 KiB	98.9 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
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable

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 233.4 KiB

URL	Transfer Size	Est Savings
www.tuvsud.com/_next/static/chunks/686-WEO-1346.js	173.9 KiB	106.9 KiB
www.tuvsud.com/_next/static/chunks/349-WEO-1346.js	110.5 KiB	92.4 KiB
assets.adobedtm.com/aa8d49dd9ad8/c60f8008e9db/launch-73985aff2ccb.min.js	113.2 KiB	34.1 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.

URL	Transfer Size
/m/53f129f37ff89c51/original/-English-Subtitles-TUV-SUD-C...	836.4 KiB
/transform/50d0992c-d81b-457b-8851-ad85eece8539/Shutterst...	287.6 KiB
/-/jssmedia/global/images/about-us/careers-new.jpg?h=724&...	181.5 KiB
www.tuvsud.com/_next/static/chunks/686-WEO-1346.js	174.2 KiB
/-/jssmedia/global/images/resource-centre/case-study/aai-...	168.0 KiB
/transform/0b4bb7e6-6e96-48bc-8417-95e19aaa8aa9/shutterst...	140.5 KiB
assets.adobedtm.com/aa8d49dd9ad8/c60f8008e9db/launch-73985aff2ccb.min.js	113.4 KiB
www.tuvsud.com/_next/static/chunks/349-WEO-1346.js	110.8 KiB
www.tuvsud.com/_next/static/css/c416a00b0876ef27.css	105.5 KiB
/transform/87942ca4-e449-48a0-9ce4-0a7a2cd90a2a/shutterst...	93.1 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
div.search-bar-content > div.search-result-content > button.search-result-close-icon > img `div.search-bar-content > div.search-result-content > button.search-result-close-icon > img`	www.tuvsud.com/weoassets/images/varianticons/cancel-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow `article.teaser-tile-tag-and-filter__item > div.teaser-tile-tag-and-filter__text-card > div.arrow > img.right_arrow`	www.tuvsud.com/weoassets/images/icons/arrowforward-white.svg
arrow `div.footer > div.gototop > button.footertotop > img`	www.tuvsud.com/weoassets/images/icons/upperarrow.svg
Sticky Contact `a.footer-email-link > div.footer-email > div.email-img > img`	www.tuvsud.com/weoassets/images/icons/emailicons.svg

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

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: 529 ms

URL	Time Spent
tuvsud.com/	278 ms
www.tuvsud.com/	251 ms
www.tuvsud.com/en	0.0 ms

●Time to Interactive 2.0 s

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 60 ms

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 4 user timings

●JavaScript execution time 0.2 s

●Minimizes main-thread work 0.5 s

●Avoid long main-thread tasks 2 long tasks found

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 50 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 30 ms

●Avoid large layout shifts 1 layout shift 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
Solutions Careers Company Newsroom Resources Sustainability `div.tuv-header > div.tuv-header__container > nav.tuv-header__main-menu > ul.tuv-header__main-menu__nav`

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Newsroom `nav.tuv-header__main-menu > ul.tuv-header__main-menu__nav > li > a`

Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
Manufacturing By navigating challenges in go-to-market strategy, TÜV SÜD partn… `div.slick-slider > div.slick-list > div.slick-track > div.slick-slide`
Medical devices Through compliance to stringent standards, TÜV SÜD enables med… `div.slick-slider > div.slick-list > div.slick-track > div.slick-slide`
Rail By navigating technological and regulatory requirements, TÜV SÜD partners… `div.slick-slider > div.slick-list > div.slick-track > div.slick-slide`
Technical Update #Technical updates #Consumer Products and Retail France: New… `div.slick-slider > div.slick-list > div.slick-track > div.slick-slide`
Technical Update #Technical updates #Consumer Products and Retail EU ECHA pro… `div.slick-slider > div.slick-list > div.slick-track > div.slick-slide`
Technical Update #Technical updates #Consumer Products and Retail USA Connect… `div.slick-slider > div.slick-list > div.slick-track > div.slick-slide`

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.

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.left-side > div.video > div.video-container > iframe.iframe-content `div.left-side > div.video > div.video-container > iframe.iframe-content`

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.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Newsroom `div.tuv-header__container > nav.tuv-header__main-menu > ul.tuv-header__main-menu__nav > li`

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

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

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

●Buttons have an accessible name

●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 use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●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

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[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 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

○Links are distinguishable without relying on color.

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○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

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
www.tuvsud.com/_next/static/chunks/686-WEO-1346.js
www.tuvsud.com/_next/static/chunks/349-WEO-1346.js

●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

○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
/en/newsroom/press-releases/2025/may/tuev-sued-achieves-s...	Read More
www.tuvsud.com/en/knowledge-hub/case-studies/aai	Read More
/en/newsroom/press-releases/2025/may/tuev-sued-achieves-s...	Read More
www.tuvsud.com/en/knowledge-hub/case-studies/aai	Read More
/en/knowledge-hub/white-papers/investment-grade-carbon-re...	Learn more
www.tuvsud.com/en/knowledge-hub/case-studies/relios-vision-gmbh	Read More
/en/knowledge-hub/white-papers/assessment-guide-for-alter...	Read More
/en/knowledge-hub/technical-updates/consumer-products-and...	Read More
/en/knowledge-hub/technical-updates/consumer-products-and...	Read More
www.tuvsud.com/en/knowledge-hub/white-papers/robotics-in-healthcare	Read More
/en/knowledge-hub/technical-updates/consumer-products-and...	Read More
/en/knowledge-hub/technical-updates/consumer-products-and...	Read More
/en/knowledge-hub/technical-updates/consumer-products-and...	Read More

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 are crawlable

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid