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Lighthouse Desktop

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

Audit breakdown by category with detailed findings.

61

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.

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.

URLEst Savings
/_assets/4b51f00386267395f41e0940abbcd656/Css/fonts/icomo...380 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:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:2.245 source:map[column:72337 line:13 type:source-location url:https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:56.05 source:map[type:text value:[unattributed]]] map[reflowTime:2.015 source:map[column:4766 line:12 type:source-location url:https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js urlProvider:network]] map[reflowTime:7.824 source:map[column:10640 line:12 type:source-location url:https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js urlProvider:network]] map[reflowTime:1.833 source:map[column:48353 line:12 type:source-location url:https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js urlProvider:network]] map[reflowTime:0.074 source:map[column:22 line:269 type:source-location url:https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/JavaScript/Src/polimi.js?1775796139 urlProvider:network]] map[reflowTime:1.119 source:map[column:180407 line:0 type:source-location url:https://www.polimi.it/_assets/f34691673face4b5c642d176b42916a9/Library/klaro/klaro.js?1765201540 urlProvider:network]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:849.5800002441406 label:Time to first byte subpart:timeToFirstByte] map[duration:618.9709997558593 label:Resource load delay subpart:resourceLoadDelay] map[duration:8731.093 label:Resource load duration subpart:resourceLoadDuration] map[duration:-7444.653 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-VIDEO
nodeLabel: div#c14813 > div.hero > div.hero__background-image > video#heroVideo-0
path: 1,HTML,1,BODY,4,DIV,4,MAIN,1,DIV,0,DIV,2,DIV,2,VIDEO
selector: div#c14813 > div.hero > div.hero__background-image > video#heroVideo-0
snippet: <video id="heroVideo-0" class="hero-video current" data-index="0" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;" autoplay="" muted="" playsinline="" loop="">

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-VIDEO
nodeLabel: div#c14813 > div.hero > div.hero__background-image > video#heroVideo-0
path: 1,HTML,1,BODY,4,DIV,4,MAIN,1,DIV,0,DIV,2,DIV,2,VIDEO
selector: div#c14813 > div.hero > div.hero__background-image > video#heroVideo-0
snippet: <video id="heroVideo-0" class="hero-video current" data-index="0" style="position: absolute; top: 0px; left: 0px; width: 100%; height: 100%;" autoplay="" muted="" playsinline="" loop="">

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

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.

URLTransfer SizeDuration
/typo3temp/assets/bootstrappackage/css/theme-8ec6393bb66a...50.1 KiB171 ms
www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/polimi.css?177579613940.2 KiB128 ms
www.polimi.it/_assets/95f1fea155c1725894ea138b1edbb31d/Scss/corsi.css?1775043311489 B
/_assets/f34691673face4b5c642d176b42916a9/Stylesheet/styl...5.7 KiB
/typo3temp/assets/css/e7e212200e72edb6153da3c9aedf7517.cs...582 B
/_assets/f6ef6adaf5c92bf687a31a3adbcb0f7b/Css/news-basic....1.2 KiB
unicons.iconscout.com/release/v4.0.8/css/line.css10.8 KiB234 ms
cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css27.2 KiB298 ms
cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.css5.4 KiB
fonts.googleapis.com/css2?family=Manrope:wght@500;700&display=swap1.1 KiB208 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.

RequestCache TTLTransfer Size
ingestion.webanalytics.italia.it/matomo.js86400.0 s65.6 KiB
cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js604800.0 s43.4 KiB
/maze-universal-loader.js?apiKey=e0283946-5145-4bcc-bfbf-...43200.0 s2.9 KiB
cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.css604800.0 s5.4 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.

URLResource SizeEst Savings
div.card-img > figure > picture > img.img-fluid div.card-img > figure > picture > img.img-fluid
www.polimi.it/fileadmin/user_upload/news/2026/summer_hp.png2.7 MiB2.7 MiB
div.card-img > figure > picture > img.img-fluid div.card-img > figure > picture > img.img-fluid
www.polimi.it/fileadmin/user_upload/news/2026/Deploy.png2.7 MiB2.7 MiB
div.card-img > figure > picture > img.img-fluid div.card-img > figure > picture > img.img-fluid
www.polimi.it/fileadmin/user_upload/news/rettorato/Rettorato_1920x816_v03.jpg1.5 MiB1.5 MiB
div.card-img > figure > picture > img.img-fluid div.card-img > figure > picture > img.img-fluid
www.polimi.it/fileadmin/user_upload/news/2026/Firma_Polimi-_Autodromo_Monza.jpg295.8 KiB273.3 KiB
Build the Future! Scopri il nostro Open Day 2026 Futuri studenti main#page-content > div.section > div#c18788 > div.banner-cta
www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Images/borealis.jpg415.6 KiB78.1 KiB
Collaborazioni Partnership internazionali Orgogliosamente parte di una rete i… main#page-content > div.section > div#c771 > div.banner-logos
/_assets/4b51f00386267395f41e0940abbcd656/Images/banner-l...149.7 KiB74.7 KiB
div.frame-group-container > div.frame-group-inner > div.frame-backgroundimage-container > div#frame-backgroundimage-c22291 div.frame-group-container > div.frame-group-inner > div.frame-backgroundimage-container > div#frame-backgroundimage-c22291
www.polimi.it/fileadmin/_processed_/d/3/csm_banner-cta-background_13b4354784.png106.5 KiB68.4 KiB
div.col-12 > div.card > picture.focus-adjust > img.w-100 div.col-12 > div.card > picture.focus-adjust > img.w-100
/fileadmin/_processed_/d/3/csm_Card_il_Primo_politecnico_...79.1 KiB35.3 KiB
div.row > div.col-6 > picture > img.img-fluid div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/banner-enhance-logo.png32.6 KiB31.9 KiB
div.col-12 > div.card > picture.focus-adjust > img.w-100 div.col-12 > div.card > picture.focus-adjust > img.w-100
/fileadmin/_processed_/b/7/csm_047-Hero_Sviluppo_Sostenib...43.7 KiB30.6 KiB
Unitech International div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/Logo_Unitech.png30.3 KiB28.8 KiB
div.row > div.col-6 > picture > img.img-fluid div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/banner-time-logo.png26.6 KiB25.6 KiB
div.col-12 > div.card > picture.focus-adjust > img.w-100 div.col-12 > div.card > picture.focus-adjust > img.w-100
/fileadmin/_processed_/7/d/csm_PolimiSpringGames-200424-9...38.1 KiB25.0 KiB
div.col-12 > div.card > picture.focus-adjust > img.w-100 div.col-12 > div.card > picture.focus-adjust > img.w-100
www.polimi.it/fileadmin/_processed_/f/1/csm_test-04_800x600_06921e914d.jpg30.8 KiB17.8 KiB
Ranking internazionali Un’eccellenza in Italia e nel mondo 1° In Italia 98° … div.container > div.row > div.col-12 > div.card
/_assets/4b51f00386267395f41e0940abbcd656/Images/card-gfx...30.3 KiB16.8 KiB
div.card__variable-flex > div.card-img-wrapper > picture.focus-adjust > img.w-100 div.card__variable-flex > div.card-img-wrapper > picture.focus-adjust > img.w-100
/fileadmin/_processed_/c/3/csm__H0A7518_Rettore_650x533_N...42.1 KiB14.7 KiB
div.row > div.col-6 > picture > img.img-fluid div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/IDEA_League.png15.1 KiB14.1 KiB
div.row > div.col-12 > div.card > ::after div.row > div.col-12 > div.card > ::after
/_assets/4b51f00386267395f41e0940abbcd656/Images/card-gfx...27.5 KiB14.0 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: 683 ms
URLTime Spent
polimi.it/683 ms
www.polimi.it/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: 50 ms 108.8 KiB
URLTransfer SizeEst Savings
/typo3temp/assets/bootstrappackage/css/theme-8ec6393bb66a...49.8 KiB45.2 KiB
www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/polimi.css?177579613939.9 KiB29.6 KiB
cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css26.8 KiB24.0 KiB
unicons.iconscout.com/release/v4.0.8/css/line.css10.0 KiB10.0 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: 250 ms 356.0 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W&cx=c&gtm=4e64k0172.9 KiB116.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-TS7S7BXS148.9 KiB80.1 KiB
www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W172.9 KiB71.3 KiB
ingestion.webanalytics.italia.it/matomo.js64.3 KiB38.2 KiB
cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js43.1 KiB27.9 KiB
ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js29.8 KiB22.6 KiB

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: 0.0 ms 2.1 KiB
URLTransfer SizeEst Savings
/_assets/4b51f00386267395f41e0940abbcd656/JavaScript/Src/...5.3 KiB2.1 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.

URLTransfer Size
www.polimi.it/fileadmin/asset/video/3_sostenibilita.mp48.9 MiB
www.polimi.it/fileadmin/asset/video/2_didattica.mp48.9 MiB
www.polimi.it/fileadmin/asset/video/1_ricerca.mp48.7 MiB
www.polimi.it/fileadmin/asset/video/0_technology.mp48.3 MiB
www.polimi.it/fileadmin/user_upload/news/2026/summer_hp.png2.7 MiB
www.polimi.it/fileadmin/user_upload/news/2026/Deploy.png2.7 MiB
www.polimi.it/fileadmin/user_upload/news/rettorato/Rettorato_1920x816_v03.jpg1.5 MiB
www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Images/borealis.jpg416.3 KiB
www.polimi.it/fileadmin/asset/video/covers/2_didattica.jpg380.8 KiB
www.polimi.it/fileadmin/user_upload/news/2026/Firma_Polimi-_Autodromo_Monza.jpg296.5 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.card__variable-flex > div.card-img-wrapper > picture.focus-adjust > img.w-100 div.card__variable-flex > div.card-img-wrapper > picture.focus-adjust > img.w-100
/fileadmin/_processed_/c/3/csm__H0A7518_Rettore_650x533_N...
div.row > div.col-6 > picture > img.img-fluid div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/banner-enhance-logo.png
Unitech International div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/Logo_Unitech.png
div.row > div.col-6 > picture > img.img-fluid div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/banner-time-logo.png
div.row > div.col-6 > picture > img.img-fluid div.row > div.col-6 > picture > img.img-fluid
www.polimi.it/fileadmin/asset/logo/IDEA_League.png

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

●Layout shift culprits
●Optimize DOM size
●Modern HTTP
●Optimize viewport for mobile
●Max Potential First Input Delay 40 ms
●Minify CSS
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.3 s
●Minimizes main-thread work 1.4 s
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 160 ms
●Server Backend Latencies 370 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 180 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○Avoid long main-thread tasks
○Avoid non-composited animations
92

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

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
Come funziona l'ammissione div.card > div.card-img-overlay > div.card-body > h4.card-title
Entra nella community della prima Università d'Italia   div.contentcontainer > div.contentcontainer-column > div.frame-header > h6.element-header
Architettura Urbanistica Ingegneria delle Costruzioni div.col-12 > div.card > div.card-body > h4.card-title
Raffrescamento sostenibile: lanciata EPIC Deploy div.card__content > div.card-body > header > h5.card-title
Convegno Renewable Energy 2026 div.card__content > div.card-body > header > h6.card-title
Polimi Community div.container > div.row > div.col-lg-4 > h4.mb-0
Sedi section#footer__accordion > section.footer__headquarters > div#c296 > h6

These are opportunities to improve keyboard navigation in your application.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Il Politecnico Formazione Dottorato Ricerca Sviluppo sostenibile Campus e servi… div.row > div.col-7 > nav.navbar > ul.navbar-nav

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

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
IT section.footer__header > ul#language_menu_footer > li.active > 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
●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.
●`button`, `link`, and `menuitem` elements have accessible names
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●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
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●`[lang]` attributes have a valid value
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●ARIA IDs are unique
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●Identical links have the same purpose.
○`[accesskey]` values are unique
○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
○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.
○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.
○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
●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
85

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
head > link

Canonical links suggest which URL to show in search results. Learn more about canonical links.

Why this matters

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

Source: MDN Permissions-Policy

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

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