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· 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.

68

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.

RequestCache TTLTransfer Size
www.synology.com/img/homebanner/20251030_forNewSite_KoreanAir/bg_1024-1920.jpg0.0 ms770.5 KiB
fileres.synology.com/images/www/homebanner/DSM73/video.webm0.0 ms683.5 KiB
/img/homebanner/20251016_forNewSite_DSM73_official/bg_144...0.0 ms674.0 KiB
www.synology.com/img/homebanner/20250109_fortest1/bg_1024-1439.jpg0.0 ms473.4 KiB
fileres.synology.com/images/www/home/rating/gartner_bg.jpg0.0 ms445.7 KiB
www.synology.com/img/homebanner/20251105_forNewSite_BC800Z/bg_1440-1920.jpg0.0 ms410.9 KiB
www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e0.0 ms316.1 KiB
www.synology.com/img/homebanner/20250925_DSM73_official/video.jpg0.0 ms297.8 KiB
www.synology.com/build/assets/js/visible.vPb2yH2r.js0.0 ms69.1 KiB
www.synology.com/js/vendor/vue.global.js0.0 ms66.2 KiB
www.synology.com/build/assets/css/syno.C_X-bDCj.css0.0 ms66.1 KiB
www.synology.com/build/assets/js/ask.DbvaElvo.js0.0 ms62.6 KiB
www.synology.com/js/vendor-legacy.concat.js0.0 ms54.5 KiB
fileres.synology.com/images/www/home/ai_advisor/bg_animation.jpg0.0 ms51.9 KiB
www.synology.com/js/vendor/dsygno/dsygno-v2.21.0.js0.0 ms51.3 KiB
synostatic.synology.com/font/inter/inter-w700-7.woff20.0 ms37.7 KiB
synostatic.synology.com/font/inter/inter-w400-7.woff20.0 ms37.7 KiB
synostatic.synology.com/font/inter/inter-w600-7.woff20.0 ms37.7 KiB
synostatic.synology.com/font/inter/inter-w500-7.woff20.0 ms37.7 KiB
www.synology.com/js/vendor/jquery.js0.0 ms35.0 KiB
www.synology.com/build/assets/js/chunks/punycode.es6.CEshK6jf.js0.0 ms30.7 KiB
www.synology.com/img/home/main/management/business_item_3.jpg0.0 ms28.4 KiB
www.synology.com/js/vendor/dsygno/dsygno-vue-v3.46.0.js?v=040a0e0.0 ms27.9 KiB
www.synology.com/img/home/main/management/business_item_4.jpg0.0 ms26.3 KiB
www.synology.com/js/vendor/splide/dist/js/splide.js0.0 ms25.7 KiB
fileres.synology.com/images/common/icons/widgets/sprite.png0.0 ms25.3 KiB
www.synology.com/img/header/img_DS.jpg0.0 ms23.7 KiB
www.synology.com/img/home/main/management/business_item_2.jpg0.0 ms21.3 KiB
cdn.livechatinc.com/tracking.js28800.0 s32.9 KiB
www.synology.com/js/vendor/dsygno/dsygno-v2.21.0.css?v=6fe2080.0 ms19.1 KiB
/build/assets/js/chunks/synoec_item_relative.vue_vue_type...0.0 ms13.7 KiB
www.synology.com/build/assets/js/general-components.BEt4FOpn.js0.0 ms12.0 KiB
www.synology.com/img/home/main/management/business_item_1.jpg0.0 ms9.6 KiB
www.synology.com/build/assets/js/syno_app.CVyVm6mx.js0.0 ms9.3 KiB
www.synology.com/build/assets/js/main.DYnHygkW.js0.0 ms8.8 KiB
www.synology.com/build/assets/css/ask.C3uIAlIP.css0.0 ms7.6 KiB
fileres.synology.com/images/www/home/rating/gartner.png0.0 ms5.1 KiB
/v3.6/customer/action/get_localization?organization_id=3c...49.0 s4.7 KiB
fileres.synology.com/images/www/home/ai_advisor/logo.png0.0 ms4.5 KiB
www.synology.com/build/assets/css/main.SeKAiMQs.css0.0 ms4.4 KiB
www.synology.com/js/vendor/dsygno/dsygno-vue-v3.46.0.css?v=6fe2080.0 ms4.1 KiB
www.synology.com/js/syno/home/ai-advisor.js?v=040a0e0.0 ms4.0 KiB
www.synology.com/build/assets/img/ad_gartner.kJYdS4Hd.png0.0 ms3.8 KiB
www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.css?v=6fe2080.0 ms3.6 KiB
www.synology.com/js/syno/home/carousel.js?v=040a0e0.0 ms3.1 KiB
/js/vendor/splide-extension-auto-scroll/dist/js/splide-ex...0.0 ms2.9 KiB
www.synology.com/build/assets/css/main.XD0Ebkb-.css0.0 ms2.7 KiB
fileres.synology.com/images/www/home/rating/stars.png0.0 ms2.0 KiB
/v3.6/customer/action/get_configuration?organization_id=3...48.0 s2.0 KiB
www.synology.com/js/vendor/splide/dist/css/splide.min.css0.0 ms1.8 KiB
www.synology.com/build/assets/css/synoec_item_relative.BTXA5I2k.css0.0 ms1.5 KiB
gallery.synology.com/images/common/icons/widgets/support.svg0.0 ms1.4 KiB
www.synology.com/build/assets/img/ad_gartner_star.CPOQPqRi.png0.0 ms1.3 KiB
www.synology.com/build/assets/js/ask.bGBl8PMY.js0.0 ms1.3 KiB
gallery.synology.com/images/common/icons/widgets/livechat.svg0.0 ms1.1 KiB
gallery.synology.com/images/common/icons/widgets/product.svg0.0 ms1.1 KiB
www.synology.com/build/assets/js/resource-identity.DHJFy5tE.js0.0 ms848 B
www.synology.com/build/assets/js/translate.CIecexaw.js0.0 ms728 B
www.synology.com/build/assets/js/translate.BzvSeT7C.js0.0 ms725 B
www.synology.com/js/syno/dom_vue.js0.0 ms713 B
/v3.6/customer/action/get_dynamic_configuration?x-region=...0.0 ms679 B
www.synology.com/build/assets/js/question.Br8G45pI.js0.0 ms599 B
www.synology.com/build/assets/js/google-analysis.Bzkmkkxw.js0.0 ms597 B
www.synology.com/build/assets/js/chunks/_commonjsHelpers.lGe4XDVY.js0.0 ms579 B
www.synology.com/build/assets/js/question-list.B27OhGMd.js0.0 ms497 B
www.synology.com/build/assets/js/chunks/_plugin-vue_export-helper.BCo6x5W8.js0.0 ms496 B
api.livechatinc.com/global-mapper/lc_license_id/5914341/region?jsonp=__lc_region0.0 ms199 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.

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:25.288 source:map[column:27323 line:2 type:source-location url:https://www.synology.com/js/vendor/jquery.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:31.003 source:map[column:18 line:240 type:source-location url:https://www.synology.com/js/vendor/splide/dist/js/splide.js urlProvider:network]] map[reflowTime:25.266 source:map[column:9561 line:20 type:source-location url:https://www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e urlProvider:network]] map[reflowTime:21.536 source:map[column:146865 line:33 type:source-location url:https://www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e urlProvider:network]] map[reflowTime:28.838 source:map[column:564021 line:33 type:source-location url:https://www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e urlProvider:network]] map[reflowTime:10.81 source:map[column:13511 line:33 type:source-location url:https://www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e urlProvider:network]] map[reflowTime:16.032 source:map[column:433651 line:33 type:source-location url:https://www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e urlProvider:network]] map[reflowTime:1.461 source:map[column:49615 line:1 type:source-location url:https://www.synology.com/js/vendor/jquery.js urlProvider:network]] map[reflowTime:2.604 source:map[column:50335 line:1 type:source-location url:https://www.synology.com/js/vendor/jquery.js urlProvider:network]] map[reflowTime:0.389 source:map[column:50393 line:1 type:source-location url:https://www.synology.com/js/vendor/jquery.js urlProvider:network]] map[reflowTime:0.278 source:map[column:50457 line:1 type:source-location url:https://www.synology.com/js/vendor/jquery.js urlProvider:network]] map[reflowTime:0.116 source:map[column:49637 line:1 type:source-location url:https://www.synology.com/js/vendor/jquery.js urlProvider:network]] map[reflowTime:0.308 source:map[column:51395 line:1 type:source-location url:https://www.synology.com/js/vendor/jquery.js urlProvider:network]] map[reflowTime:0.124 source:map[column:52410 line:1 type:source-location url:https://www.synology.com/js/vendor/jquery.js urlProvider:network]] map[reflowTime:15.821 source:map[column:3726 line:0 type:source-location url:https://www.synology.com/build/assets/js/syno_app.CVyVm6mx.js urlProvider:network]] map[reflowTime:0.184 source:map[column:100516 line:0 type:source-location url:https://www.synology.com/build/assets/js/ask.DbvaElvo.js urlProvider:network]] map[reflowTime:2.522 source:map[column:138744 line:0 type:source-location url:https://www.synology.com/build/assets/js/ask.DbvaElvo.js urlProvider:network]]]

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
picture.s-pic > img.s-img picture.s-pic > img.s-img
fileres.synology.com/images/www/home/rating/gartner_bg.jpg444.7 KiB406.5 KiB
Secure your data, scale your success picture.s-pic > img#homeBanner-bg-homebanner-BC800Z
www.synology.com/img/homebanner/20251105_forNewSite_BC800Z/bg_1440-1920.jpg410.1 KiB278.3 KiB
s-link#home-latest-link-2-revamped_2023_PB_storage > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img s-link#home-latest-link-2-revamped_2023_PB_storage > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img
www.synology.com/api/homepage/smallbanner/getImage/105495.3 KiB87.0 KiB
s-link#home-latest-link-3-revamped_Security_Video > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img s-link#home-latest-link-3-revamped_Security_Video > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img
www.synology.com/api/homepage/smallbanner/getImage/107366.0 KiB57.7 KiB
s-link#home-latest-link-4-revamped_Bee_Station > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img s-link#home-latest-link-4-revamped_Bee_Station > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img
www.synology.com/api/homepage/smallbanner/getImage/106763.1 KiB54.8 KiB
s-link#home-latest-link-1-revamped_synology_hdd > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img s-link#home-latest-link-1-revamped_synology_hdd > div.home-latest__link-img-wrapper > picture > img.home-latest__link-img
www.synology.com/api/homepage/smallbanner/getImage/104353.3 KiB45.0 KiB
picture.s-pic > img.s-img picture.s-pic > img.s-img
fileres.synology.com/images/www/home/ai_advisor/bg_animation.jpg51.3 KiB40.9 KiB
div.mwb__zidx-b > div.mwb-fs > button.mwb-toggle > img.mwb-toggle__icon div.mwb__zidx-b > div.mwb-fs > button.mwb-toggle > img.mwb-toggle__icon
fileres.synology.com/images/common/icons/widgets/sprite.png24.8 KiB18.6 KiB
Image of an IT professional using Synology Surveillance Station picture.s-pic > img.s-img
www.synology.com/img/home/main/management/business_item_3.jpg28.0 KiB14.8 KiB
Image of a desktop set up of a Synology NAS/SAN with Synology Office Suite picture.s-pic > img.s-img
www.synology.com/img/home/main/management/business_item_4.jpg25.9 KiB12.7 KiB
Image of Synology's ActiveProtect Appliance and a laptop featuring ActivePr… picture.s-pic > img.s-img
www.synology.com/img/home/main/management/business_item_2.jpg20.9 KiB7.7 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-1-IMG
nodeLabel: Secure your data, scale your success
path: 1,HTML,1,BODY,4,DIV,2,MAIN,0,S-WIZ,0,S-SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,S-IMG,a,#document-fragment,1,PICTURE,7,IMG
selector: picture.s-pic > img#homeBanner-bg-homebanner-BC800Z
snippet: <img id="homeBanner-bg-homebanner-BC800Z" part="img" class="s-img s-img" loading="lazy" alt="Secure your data, scale your success">

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
www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e316.1 KiB281 ms
www.synology.com/js/vendor-legacy.concat.js54.5 KiB80 ms
www.synology.com/js/syno/home/carousel.js?v=040a0e3.1 KiB
www.synology.com/js/syno/home/ai-advisor.js?v=040a0e4.0 KiB
www.synology.com/js/vendor/dsygno/dsygno-vue-v3.46.0.js?v=040a0e27.9 KiB
www.synology.com/js/vendor/dsygno/dsygno-v2.21.0.js51.3 KiB
www.synology.com/js/vendor/splide/dist/js/splide.js25.7 KiB
/js/vendor/splide-extension-auto-scroll/dist/js/splide-ex...2.9 KiB
www.synology.com/js/vendor/dsygno/dsygno-v2.21.0.css?v=6fe20819.1 KiB
www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.css?v=6fe2083.6 KiB
www.synology.com/js/vendor/dsygno/dsygno-vue-v3.46.0.css?v=6fe2084.1 KiB
www.synology.com/js/vendor/splide/dist/css/splide.min.css1.8 KiB
www.synology.com/js/vendor/vue.global.js66.2 KiB
www.synology.com/js/vendor/jquery.js35.0 KiB
www.synology.com/js/syno/dom_vue.js713 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: 784 ms
URLTime Spent
synology.com/506 ms
www.synology.com/279 ms
www.synology.com/en-global0.0 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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 81.7 KiB
URLTransfer SizeEst Savings
www.synology.com/build/assets/css/syno.C_X-bDCj.css65.7 KiB63.0 KiB
www.synology.com/js/vendor/dsygno/dsygno-v2.21.0.css?v=6fe20818.8 KiB18.7 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: 280 ms 398.7 KiB
URLTransfer SizeEst Savings
www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e315.7 KiB140.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-PNPJHJ2174.4 KiB80.5 KiB
www.synology.com/js/vendor-legacy.concat.js53.6 KiB43.3 KiB
www.synology.com/build/assets/js/ask.DbvaElvo.js62.2 KiB38.4 KiB
www.synology.com/js/vendor/dsygno/dsygno-v2.21.0.js50.9 KiB37.5 KiB
www.synology.com/js/vendor/vue.global.js65.8 KiB30.4 KiB
www.synology.com/build/assets/js/visible.vPb2yH2r.js68.7 KiB28.2 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 reasonFailure type
Pages with WebSocket cannot enter back/forward cache.Pending browser support

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 7.0 KiB
URLTransfer SizeEst Savings
www.synology.com/js/vendor/splide/dist/js/splide.js25.3 KiB7.0 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.synology.com/img/homebanner/20251030_forNewSite_KoreanAir/bg_1024-1920.jpg770.5 KiB
fileres.synology.com/images/www/homebanner/DSM73/video.webm683.5 KiB
/img/homebanner/20251016_forNewSite_DSM73_official/bg_144...674.0 KiB
www.synology.com/img/homebanner/20250109_fortest1/bg_1024-1439.jpg473.4 KiB
fileres.synology.com/images/www/home/rating/gartner_bg.jpg445.7 KiB
www.synology.com/img/homebanner/20251105_forNewSite_BC800Z/bg_1440-1920.jpg410.9 KiB
www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e316.1 KiB
www.synology.com/img/homebanner/20250925_DSM73_official/video.jpg297.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-PNPJHJ2174.8 KiB
fileres.synology.com/images/common/favicon/syno/favicon.ico137.6 KiB

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

●Layout shift culprits
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 3 user timings
●JavaScript execution time 0.7 s
●Minimizes main-thread work 1.8 s
●Avoid long main-thread tasks 1 long task found
●Avoid non-composited animations 9 animated elements found
●Image elements have explicit `width` and `height`
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 570 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 350 ms
●Avoid large layout shifts 2 layout shifts found
○INP breakdown
88

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.

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
France - Français div.s-ddv2__container > div.s-ddv2__combobox > div.s-ddv2__control > button.s-ddv2__control-content

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
s-section#home-ai-advisor > s-container.home-ai-advisor__input-wrapper > div.home-ai-advisor__input > textarea#home-ai-advisor-textarea s-section#home-ai-advisor > s-container.home-ai-advisor__input-wrapper > div.home-ai-advisor__input > textarea#home-ai-advisor-textarea

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.

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
Continuer div.ip-banner > div.s-containerless > div.ip-banner__btn-box > a.ip-banner__btn-box__btn-continue-wrapper

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Storage and Data Management a.s-link
Data Protection a.s-link
Video Surveillance a.s-link
Business Productivity a.s-link
Open language picker div.m-lp > button.m-lp-toggle
○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
●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
●`[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.
●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
●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
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements 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
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○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.

URLMap URL
www.synology.com/js/vendor/dsygno/dsygno-v3.50.0.js?v=040a0e
www.synology.com/js/vendor-legacy.concat.jswww.synology.com/js/iframeResizer.map
●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
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

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.

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.ip-banner > div.s-containerless > div.ip-banner__btn-box > a.btn-close div.ip-banner > div.s-containerless > div.ip-banner__btn-box > a.btn-close

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
●Links have descriptive text
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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