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.

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
www.kit.edu/img/intern/kit-1920-700.jpg	0.0 ms	712.6 KiB
www.kit.edu/img/hannover-messe_2026.jpg	0.0 ms	601.5 KiB
www.kit.edu/img/2026_034_Colloquium-Fundamentale_rdax_1024x576_98s.jpg	0.0 ms	244.5 KiB
www.kit.edu/img/header-Studieren-KIT-2024.jpg	0.0 ms	243.4 KiB
www.kit.edu/img/hannover-messe-20260420-SG-01-019_rdax_98s.jpg	0.0 ms	235.7 KiB
www.kit.edu/img/Forschen/studieren-20110107-CS-03-173.jpg	0.0 ms	224.3 KiB
www.kit.edu/img/kit-20221005-MH-01-001_rdax_98s.jpg	0.0 ms	161.0 KiB
www.kit.edu/img/kuenstliche-intelligenz-20251113-AB-01-009.jpg	0.0 ms	143.3 KiB
www.kit.edu/img/lookKIT_202601.jpg	0.0 ms	124.8 KiB
www.kit.edu/img/header-gruenderszene.jpg	0.0 ms	120.0 KiB
www.kit.edu/7.php.css	0.0 ms	38.1 KiB
www.kit.edu/img/seltenerd-verbindungen-teaser_rdax_98s.jpg	0.0 ms	27.1 KiB
www.kit.edu/31.php	0.0 ms	2.7 KiB
www.kit.edu/38.js	0.0 ms	778 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
static.scc.kit.edu/kit-2020/fonts/kit-icons/kit-icons.ttf?2haur7	110 ms
static.scc.kit.edu/kit-2020/fontawesome/webfonts/fa-solid-900.woff2	110 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
Professor Christoph Kirchlechner präsentiert aktuelle Fusionsforschung auf dem … `figure.watermark > div.container > picture > img`	www.kit.edu/img/hannover-messe_2026.jpg	601.1 KiB	535.4 KiB
Umfrage 2026 - Jetzt teilnehmen Nicht wieder anzeigen `main > section#main_content > div.content > div#feedback_2026_banner`	www.kit.edu/img/intern/kit-1920-700.jpg	712.1 KiB	493.4 KiB
Colloquium Fundamentale: „Mit erhobenem Zeigefinger? Wenn Moral den Diskurs bes… `figure.watermark > a.container > picture > img`	www.kit.edu/img/2026_034_Colloquium-Fundamentale_rdax_1024x576_98s.jpg	244.3 KiB	207.4 KiB
Bundeskanzler besucht das KIT auf der Hannover Messe `figure.watermark > a.container > picture > img`	www.kit.edu/img/hannover-messe-20260420-SG-01-019_rdax_98s.jpg	235.5 KiB	198.5 KiB
Studierende am KIT `figure.watermark > div.container > picture > img`	www.kit.edu/img/Forschen/studieren-20110107-CS-03-173.jpg	224.1 KiB	132.5 KiB
KIT veröffentlicht Positionspapier zu sicherheitsrelevanter Forschung `figure.watermark > a.container > picture > img`	www.kit.edu/img/kit-20221005-MH-01-001_rdax_98s.jpg	160.8 KiB	123.8 KiB
Blurred blue Code/Text Zeilen als Hintergrund. `figure.watermark > div.container > picture > img`	www.kit.edu/img/kuenstliche-intelligenz-20251113-AB-01-009.jpg	143.1 KiB	53.6 KiB
Titelseite von lookKIT zum Thema Transfer `figure.watermark > div.container > picture > img`	www.kit.edu/img/lookKIT_202601.jpg	124.6 KiB	52.2 KiB
section.swiper-container > div.swiper-wrapper > div.swiper-slide > div.image `section.swiper-container > div.swiper-wrapper > div.swiper-slide > div.image`	www.kit.edu/img/header-Studieren-KIT-2024.jpg	243.2 KiB	24.5 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-9-DIV

nodeLabel: section.swiper-container > div.swiper-wrapper > div.swiper-slide > div.image

path: 1,HTML,1,BODY,5,MAIN,0,SECTION,0,DIV,1,DIV,2,DIV

selector: section.swiper-container > div.swiper-wrapper > div.swiper-slide > div.image

snippet: <div class="image" style="background-image: url('/img/header-gruenderszene.jpg')">

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
static.scc.kit.edu/kit-2020/js/jquery-3.4.1.min.js	29.7 KiB	177 ms
static.scc.kit.edu/kit-2020/js/main.js	59.3 KiB	355 ms
static.scc.kit.edu/kit-2020/fontawesome/css/all.min.css	23.9 KiB	177 ms
static.scc.kit.edu/fancybox/dist/jquery.fancybox.min.js	16.5 KiB	177 ms
static.scc.kit.edu/kit-2020/js/kit.js	8.0 KiB
static.scc.kit.edu/fancybox/dist/jquery.fancybox.min.css	3.4 KiB	874 ms
static.scc.kit.edu/kit-2020/js/legacy-compat.js	1.2 KiB
www.kit.edu/7.php.css	38.1 KiB	450 ms
www.kit.edu/31.php	2.7 KiB
www.kit.edu/38.js	778 B

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: 830 ms

URL	Time Spent
kit.edu/	830 ms
www.kit.edu/	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

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.

Estimated savings: 150 ms 17.8 KiB

URL	Transfer Size	Est Savings
static.scc.kit.edu/kit-2020/js/main.js	59.2 KiB	15.1 KiB
static.scc.kit.edu/kit-2020/js/kit.js	7.9 KiB	2.7 KiB

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: 450 ms 51.9 KiB

URL	Transfer Size	Est Savings
www.kit.edu/7.php.css	38.0 KiB	28.3 KiB
static.scc.kit.edu/kit-2020/fontawesome/css/all.min.css	23.8 KiB	23.6 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 150 ms 34.1 KiB

URL	Transfer Size	Est Savings
static.scc.kit.edu/kit-2020/js/main.js	59.2 KiB	34.1 KiB

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 8.4 KiB

URL	Transfer Size	Est Savings
www.kit.edu/7.php.css	38.1 KiB	8.4 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
www.kit.edu/img/intern/kit-1920-700.jpg	712.6 KiB
www.kit.edu/img/hannover-messe_2026.jpg	601.5 KiB
www.kit.edu/img/2026_034_Colloquium-Fundamentale_rdax_1024x576_98s.jpg	244.5 KiB
www.kit.edu/img/header-Studieren-KIT-2024.jpg	243.4 KiB
www.kit.edu/img/hannover-messe-20260420-SG-01-019_rdax_98s.jpg	235.7 KiB
www.kit.edu/img/Forschen/studieren-20110107-CS-03-173.jpg	224.3 KiB
www.kit.edu/img/kit-20221005-MH-01-001_rdax_98s.jpg	161.0 KiB
www.kit.edu/img/kuenstliche-intelligenz-20251113-AB-01-009.jpg	143.3 KiB
www.kit.edu/img/lookKIT_202601.jpg	124.8 KiB
www.kit.edu/img/header-gruenderszene.jpg	120.0 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.swiper-wrapper > div.swiper-slide > div.image > img `div.swiper-wrapper > div.swiper-slide > div.image > img`	www.kit.edu/img/header-Studieren-KIT-2024.jpg
div.swiper-wrapper > div.swiper-slide > div.image > img `div.swiper-wrapper > div.swiper-slide > div.image > img`	www.kit.edu/img/header-gruenderszene.jpg
div.swiper-wrapper > div.swiper-slide > div.image > img `div.swiper-wrapper > div.swiper-slide > div.image > img`	www.kit.edu/img/header-Studieren-KIT-2024.jpg
div.swiper-wrapper > div.swiper-slide > div.image > img `div.swiper-wrapper > div.swiper-slide > div.image > img`	www.kit.edu/img/header-gruenderszene.jpg
Bundeskanzler besucht das KIT auf der Hannover Messe `figure.watermark > a.container > picture > img`	www.kit.edu/img/hannover-messe-20260420-SG-01-019_rdax_98s.jpg
KIT veröffentlicht Positionspapier zu sicherheitsrelevanter Forschung `figure.watermark > a.container > picture > img`	www.kit.edu/img/kit-20221005-MH-01-001_rdax_98s.jpg
Colloquium Fundamentale: „Mit erhobenem Zeigefinger? Wenn Moral den Diskurs bes… `figure.watermark > a.container > picture > img`	www.kit.edu/img/2026_034_Colloquium-Fundamentale_rdax_1024x576_98s.jpg
Neue Seltenerd-Verbindungen als potenzielle Datenspeicher der Zukunft `figure.watermark > a.container > picture > img`	www.kit.edu/img/seltenerd-verbindungen-teaser_rdax_98s.jpg
PRANA `figure.watermark > div.container > picture > img`	www.kit.edu/admin/events/images/ajax/image.php?ev_id=47512&format=widget

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

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 40 ms

●JavaScript execution time 0.3 s

●Minimizes main-thread work 1.0 s

●Avoid long main-thread tasks 3 long tasks found

●Avoid non-composited animations 3 animated elements found

●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

●Initial server response time was short Root document took 70 ms

○INP breakdown

○User Timing marks and measures

○Avoid large layout shifts

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.

Navigation

Access keys let users quickly focus a part of the page. For proper navigation, each access key must be unique. Learn more about access keys.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Home `div.navigation > ul.side-widgets > li.meta > a`
Impressum `div.navigation > ul.side-widgets > li.meta > a`
Sitemap `div.navigation > ul.side-widgets > li.meta > a`

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
Forschungsorientiertes Studium `div.swiper-slide > div.stage-slider-tiles > a.stage-slider-tile > h3`
Mehr als eine gute Idee `div.swiper-slide > div.stage-slider-tiles > a.stage-slider-tile > h3`
Forschungsorientiertes Studium `div.swiper-slide > div.stage-slider-tiles > a.stage-slider-tile > h3`
Mehr als eine gute Idee `div.swiper-slide > div.stage-slider-tiles > a.stage-slider-tile > h3`
PRANA `div.event-content > div.info > a > h4.h4`

These are opportunities to improve keyboard navigation in your application.

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
header.page-header > div.content-wrap > div.navigation > button.burger `header.page-header > div.content-wrap > div.navigation > button.burger`
div.dropdown > ul.navigation-breadcrumb > li.home > button `div.dropdown > ul.navigation-breadcrumb > li.home > button`
div.dropdown > ul.navigation-breadcrumb > li.home > button `div.dropdown > ul.navigation-breadcrumb > li.home > button`
div.dropdown > ul.navigation-breadcrumb > li.home > button `div.dropdown > ul.navigation-breadcrumb > li.home > button`
div.dropdown > ul.navigation-breadcrumb > li.home > button `div.dropdown > ul.navigation-breadcrumb > li.home > button`
div.dropdown > ul.navigation-breadcrumb > li.home > button `div.dropdown > ul.navigation-breadcrumb > li.home > button`
div.dropdown > ul.navigation-breadcrumb > li.home > button `div.dropdown > ul.navigation-breadcrumb > li.home > button`

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
Das KIT `div.dropdown > ul.navigation-breadcrumb > li > span`
Themen `div.dropdown > ul.navigation-breadcrumb > li > span`
Studium `div.dropdown > ul.navigation-breadcrumb > li > span`
Forschung `div.dropdown > ul.navigation-breadcrumb > li > span`
Innovation `div.dropdown > ul.navigation-breadcrumb > li > span`
Karriere `div.dropdown > ul.navigation-breadcrumb > li > span`
Home `div.navigation > ul.side-widgets > li.meta > a`
Leichte Sprache `div.navigation > ul.side-widgets > li.meta > a`
Gebärdensprache `div.navigation > ul.side-widgets > li.meta > a`
Impressum `div.navigation > ul.side-widgets > li.meta > a`
Datenschutz `div.navigation > ul.side-widgets > li.meta > a`
Barrierefreiheit `div.navigation > ul.side-widgets > li.meta > a`
Sitemap `div.navigation > ul.side-widgets > li.meta > a`
Intranet `div.navigation > ul.side-widgets > li.meta > a`
MEHR ERFAHREN `div#div_27205 > div.tilecontent > div.bottom > a.button`
MEHR ERFAHREN `div#div_27112 > div.tilecontent > div.bottom > a.button`
MEHR ERFAHREN `div#div_34313 > div.tilecontent > div.bottom > a.button`
MEHR ERFAHREN `div#div_27204 > div.tilecontent > div.bottom > a.button`
Exzellenz `div#div_31164 > p > a > strong`
Als Exzellenzuniversität stärkt das KIT seine Spitzenforschung, pflegt den inte… `section#main_content > div.content > div#div_31164 > p`
Science for Impact `div#div_31163 > p > a > strong`
Das KIT übernimmt gesellschaftliche Verantwortung und trägt zur Gestaltung eine… `section#main_content > div.content > div#div_31163 > p`

These are opportunities to improve the legibility of your content.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Go to slide 1 `main > section.swiper-container > div.swiper-pagination > span.swiper-pagination-bullet`
Go to slide 2 `main > section.swiper-container > div.swiper-pagination > span.swiper-pagination-bullet`
Home `div.content-wrap > ul > li > a`
Leichte Sprache `div.content-wrap > ul > li > a`
Gebärdensprache `div.content-wrap > ul > li > a`
Impressum `div.content-wrap > ul > li > a`
Datenschutz `div.content-wrap > ul > li > a`
Barrierefreiheit `div.content-wrap > ul > li > a`
Sitemap `div.content-wrap > ul > li > a`
Intranet `div.content-wrap > ul > li > a`
KIT `div.content-wrap > ul > li > a`

These items highlight common accessibility best practices.

○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.

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

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

●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 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

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

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

○`[aria-hidden="true"]` elements do not contain focusable descendents

○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

○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.

○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.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.	static.scc.kit.edu/kit-2020/js/jquery-3.4.1.min.js line 1, col 79777

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No 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

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

hreflang links tell search engines what version of a page they should list in search results for a given language or region. Learn more about `hreflang`.

Why this matters

Performance issues directly impact user engagement and conversion rates.


`head > link`
`head > link`

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

○Document has a valid `rel=canonical`