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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.

60

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.bt.cn/static/astro/images/home/banner-1/bt_video.gif43200.0 s2.7 MiB
www.bt.cn/static/astro/images/home/banner-1/banner-bg-3.png43200.0 s314.7 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-bg-1.png43200.0 s274.3 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-bg-2.png43200.0 s228.5 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-domain-overview.png43200.0 s167.7 KiB
www.bt.cn/static/astro/woff2/fa-solid-900.woff243200.0 s111.0 KiB
www.bt.cn/static/astro/images/home/overview-tabs/tabs/website.png43200.0 s99.8 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-ssl-overview.png43200.0 s97.3 KiB
www.bt.cn/static/astro/images/wechat/wechat-all.png43200.0 s68.3 KiB
www.bt.cn/static/astro/images/trust/xiehui.png43200.0 s62.1 KiB
www.bt.cn/static/astro/js/utils-vendor.js?version=177682159343200.0 s60.7 KiB
www.bt.cn/static/astro/images/trust/yanjiu.png43200.0 s60.5 KiB
www.bt.cn/static/astro/css/1111-1.css?version=177682159343200.0 s53.6 KiB
www.bt.cn/static/astro/images/wechat/wechat-customer.png43200.0 s51.6 KiB
www.bt.cn/static/astro/js/vue-vendor.js?version=177682159343200.0 s39.0 KiB
www.bt.cn/static/astro/images/home/overview-tabs/tabs-active.png43200.0 s36.2 KiB
www.bt.cn/static/astro/images/trust/njsj.png43200.0 s34.5 KiB
www.bt.cn/static/astro/images/trust/fuli.png43200.0 s33.2 KiB
www.bt.cn/static/astro/images/trust/hunan.png43200.0 s30.5 KiB
scripts.clarity.ms/0.8.59/clarity.js86400.0 s26.2 KiB
www.bt.cn/static/astro/images/wechat/wechat-group.png43200.0 s14.0 KiB
www.bt.cn/static/astro/images/decoration/panel-pc.png43200.0 s12.5 KiB
aqyzmedia.yunaq.com/labels/label_sm_90020.png86400.0 s8.5 KiB
/static/astro/js/Layout.astro_astro_type_script_index_0_l...43200.0 s5.5 KiB
www.bt.cn/static/astro/css/index.css?version=177682159343200.0 s3.2 KiB
www.bt.cn/static/astro/images/home/free-icon.png43200.0 s3.2 KiB
/static/astro/js/StoryCarousel.astro_astro_type_script_in...43200.0 s3.2 KiB
/static/astro/js/index.astro_astro_type_script_index_0_la...43200.0 s2.5 KiB
/static/astro/js/CustomerServiceTooltip.astro_astro_type_...43200.0 s957 B
/static/astro/js/Header.astro_astro_type_script_index_0_l...43200.0 s558 B
/static/astro/js/NotificationSlide.astro_astro_type_scrip...43200.0 s558 B
www.bt.cn/static/astro/js/__commonjsHelpers__.js?version=177682159343200.0 s457 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.

URLEst Savings
www.bt.cn/static/astro/woff2/fa-solid-900.woff2575 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:61.92 source:map[column:31 line:148 type:source-location url:https://www.bt.cn/new/index.html 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
宝塔面板视频 div.story-track > div.story-slide > div.flex > img.home-banner-image-one
www.bt.cn/static/astro/images/home/banner-1/bt_video.gif2.7 MiB2.6 MiB
域名管理 div.story-track > div.story-slide > div.w-[1400px] > img.absolute
www.bt.cn/static/astro/images/home/banner-1/banner-domain-overview.png167.2 KiB129.7 KiB
证书管理 div.story-track > div.story-slide > div.w-[1400px] > img.home-banner-images
www.bt.cn/static/astro/images/home/banner-1/banner-bg-3.png314.0 KiB118.6 KiB
宝塔面板 div.story-track > div.story-slide > div.flex > img.home-banner-images
www.bt.cn/static/astro/images/home/banner-1/banner-bg-1.png273.6 KiB78.3 KiB
证书管理 div.story-track > div.story-slide > div.w-[1400px] > img.absolute
www.bt.cn/static/astro/images/home/banner-1/banner-ssl-overview.png96.9 KiB72.0 KiB
协会 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/xiehui.png61.7 KiB61.1 KiB
研究院 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/yanjiu.png60.1 KiB59.4 KiB
微信客服二维码 div.footer-qrcode > div.footer-qrcode-box > div#footer-customer-btn > img.footer-qr-thumbnail
www.bt.cn/static/astro/images/wechat/wechat-customer.png51.2 KiB50.7 KiB
域名管理 div.story-track > div.story-slide > div.w-[1400px] > img.home-banner-images
www.bt.cn/static/astro/images/home/banner-1/banner-bg-2.png227.9 KiB47.5 KiB
南京审计 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/njsj.png34.2 KiB33.3 KiB
富力 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/fuli.png32.8 KiB31.9 KiB
湖南 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/hunan.png30.2 KiB29.5 KiB
快速创建/管理网站 快速创建并管理你的网站便捷的网站管理功能，例如域名绑定，一键部署SSL证书，更改网站配置等功能 div.overview-container > div.hidden > ul.overview-list > li.item
www.bt.cn/static/astro/images/home/overview-tabs/tabs-active.png35.8 KiB24.5 KiB
宝塔交流群二维码 div.footer-qrcode > div.footer-qrcode-box > div#footer-group-btn > img.footer-qr-thumbnail
www.bt.cn/static/astro/images/wechat/wechat-group.png13.7 KiB13.5 KiB
div.footer-bottom > div.footer-bottom-links > a.footer-bottom-link > img.inline-block div.footer-bottom > div.footer-bottom-links > a.footer-bottom-link > img.inline-block
aqyzmedia.yunaq.com/labels/label_sm_90020.png7.9 KiB7.7 KiB

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:1895.845 label:Time to first byte subpart:timeToFirstByte] map[duration:14.833 label:Resource load delay subpart:resourceLoadDelay] map[duration:1302.405 label:Resource load duration subpart:resourceLoadDuration] map[duration:63.821 label:Element render delay subpart:elementRenderDelay]]
lhId: page-15-IMG
nodeLabel: 宝塔面板
path: 1,HTML,1,BODY,2,MAIN,0,STORY-CAROUSEL,1,DIV,1,DIV,1,DIV,0,IMG
selector: div.story-track > div.story-slide > div.flex > img.home-banner-images
snippet: <img src="/static/astro/images/home/banner-1/banner-bg-1.png" alt="宝塔面板" loading="eager" decoding="async" fetchpriority="auto" width="1440" height="600" class="home-banner-images">

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-15-IMG
nodeLabel: 宝塔面板
path: 1,HTML,1,BODY,2,MAIN,0,STORY-CAROUSEL,1,DIV,1,DIV,1,DIV,0,IMG
selector: div.story-track > div.story-slide > div.flex > img.home-banner-images
snippet: <img src="/static/astro/images/home/banner-1/banner-bg-1.png" alt="宝塔面板" loading="eager" decoding="async" fetchpriority="auto" width="1440" height="600" class="home-banner-images">

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.

URLTransfer SizeDuration
www.bt.cn/static/astro/css/1111-1.css?version=177682159353.6 KiB98 ms
www.bt.cn/static/astro/css/index.css?version=17768215933.2 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: 2.0 s
URLTime Spent
bt.cn/853 ms
www.bt.cn/1.1 s
www.bt.cn/new/index.html0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 45.2 KiB
URLTransfer SizeEst Savings
www.bt.cn/static/astro/css/1111-1.css?version=177682159353.3 KiB45.2 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
The page has an unload handler in the main frame.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 76.9 KiB
URLTransfer SizeEst Savings
www.bt.cn/static/astro/js/utils-vendor.js?version=177682159359.9 KiB41.5 KiB
www.bt.cn/static/astro/js/vue-vendor.js?version=177682159338.6 KiB35.4 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.

URLTransfer Size
www.bt.cn/static/astro/images/home/banner-1/bt_video.gif2.7 MiB
www.bt.cn/static/astro/images/home/banner-1/banner-bg-3.png314.7 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-bg-1.png274.3 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-bg-2.png228.5 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-domain-overview.png167.7 KiB
www.bt.cn/static/astro/woff2/fa-solid-900.woff2111.0 KiB
www.bt.cn/static/astro/images/home/overview-tabs/tabs/website.png99.8 KiB
www.bt.cn/static/astro/images/home/banner-1/banner-ssl-overview.png97.3 KiB
www.bt.cn/static/astro/images/wechat/wechat-all.png68.3 KiB
www.bt.cn/static/astro/images/trust/xiehui.png62.1 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
南京审计 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/njsj.png
南京审计 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/njsj.png
南京审计 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/njsj.png
研究院 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/yanjiu.png
研究院 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/yanjiu.png
研究院 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/yanjiu.png
湖南 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/hunan.png
湖南 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/hunan.png
湖南 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/hunan.png
富力 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/fuli.png
富力 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/fuli.png
富力 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/fuli.png
协会 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/xiehui.png
协会 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/xiehui.png
协会 div#viewport > div#track > div.card > img.!max-w-[80%]
www.bt.cn/static/astro/images/trust/xiehui.png
执行安装命令 ol.flex > li.h-[330px] > div.w-full > img.w-auto
www.bt.cn/static/astro/images/home/step/command.svg
初始化配置 ol.flex > li.h-[330px] > div.w-full > img.w-auto
www.bt.cn/static/astro/images/home/step/init.svg
访问面板 ol.flex > li.h-[330px] > div.w-full > img.w-auto
www.bt.cn/static/astro/images/home/step/panel.svg
通过SSH连接服务器 ol.flex > li.h-[330px] > div.w-full > img.w-auto
www.bt.cn/static/astro/images/home/step/download.svg
div.flex > div.flex > h1.xl:text-[56px] > img.ml-4 div.flex > div.flex > h1.xl:text-[56px] > img.ml-4
www.bt.cn/static/astro/images/home/free-icon.png
div.flex > div.flex > h1.xl:text-[56px] > img.ml-4 div.flex > div.flex > h1.xl:text-[56px] > img.ml-4
www.bt.cn/static/astro/images/home/free-icon.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
●Minify JavaScript
●JavaScript execution time 0.1 s
●Minimizes main-thread work 1.1 s
●Avoid non-composited animations 9 animated elements found
●Network Requests
●Network Round Trip Times 250 ms
●Server Backend Latencies 290 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 500 ms
●Avoid large layout shifts 12 layout shifts found
○INP breakdown
○User Timing marks and measures
○Avoid long main-thread tasks
79

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

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
SSL证书 安全防护 为您的网站保驾护航 提供多品牌SSL证书服务，支持DV、OV、EV等多种验证级别，为您的网站数据传输提供银行级加密保护。 专业团队技术支… main.body-main > story-carousel#story-carousel-a94vs43 > div.story-track > div.story-slide
宝塔， 安全高效 的服务器运维面板 全球超2000万台服务器安装宝塔，近300万注册用户使用宝塔，持续更新维护9年值得信赖 立即免费安装宝塔面板 宝塔1v1安… main.body-main > story-carousel#story-carousel-a94vs43 > div.story-track > div.story-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

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
body.overflow-x-hidden > div#floating-actions > div.inline-block > button#floating-qr-service body.overflow-x-hidden > div#floating-actions > div.inline-block > button#floating-qr-service

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.flex > div.flex > h1.xl:text-[56px] > img.ml-4 div.flex > div.flex > h1.xl:text-[56px] > img.ml-4

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.footer-container > div.footer-bottom > div.footer-bottom-links > a.footer-bottom-link div.footer-container > div.footer-bottom > div.footer-bottom-links > a.footer-bottom-link

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
注册 nav.nav-bar > div#nav-auth > div#auth-buttons > a.btn
全球超2000万台服务器安装宝塔，近300万注册用户使用宝塔，持续更新维护9年值得信赖 div.home-banner-header > div.flex > div.flex > div.lg:text-[18px]
宝塔1v1安全运维服务 div.home-banner-header > div.banner-btn-group > a#home-service-btn > div.main-title
02. ul.overview-list > li.item > div.btn-tab > span.num
03. ul.overview-list > li.item > div.btn-tab > span.num
04. ul.overview-list > li.item > div.btn-tab > span.num
05. ul.overview-list > li.item > div.btn-tab > span.num
多种不同品牌的(HTTPS)SSL证书快速接入，保障您网站安全，提升用户信任度 div.mx-auto > section.w-full > a.p-10 > p.mt-2
宝塔团队拥有10余年服务器运维行业经验，为您的业务保驾护航 div.mx-auto > section.w-full > a.p-10 > p.mt-2
提供价格实惠的域名注册服务，价格透明，无需隐藏费用，一键快速注册 div.mx-auto > section.w-full > a.p-10 > p.mt-2
海量用户关注，信赖倍增 ul.w-full > li.flex > div.flex > span.text-[#787a79]
于中央大型政企广泛使用 ul.w-full > li.flex > div.flex > span.text-[#787a79]
超过220万注册用户 ul.w-full > li.flex > div.flex > span.text-[#787a79]
支持一键 LAMP/LNMP/集群/监控/网站/FTP/数据库/JAVA 等 100+ 服务器管理能力 main.body-main > div.pt-[40px] > div.gap-[10px] > div.md:text-[18px]
使用堡塔 SSH 终端快速连接服务器，免去复杂密钥配置，保障连接安全与效率。 div.mx-auto > ol.flex > li.h-[330px] > p.mt-2
复制下方安装命令，在 SSH 终端中执行，快速开始安装面板。 div.mx-auto > ol.flex > li.h-[330px] > p.mt-2
安装完成后，按照提示访问链接并使用初始账号密码登录，开始管理服务器。 div.mx-auto > ol.flex > li.h-[330px] > p.mt-2
首次登录根据业务需要一键安装网站环境配置。 div.mx-auto > ol.flex > li.h-[330px] > p.mt-2
更多安装方式 div.pt-[40px] > div.mx-auto > section.flex > a.btn
立即安装 div#openclaw-notification > div.notification-card > div.relative > a.flex

These are opportunities to improve the legibility of your content.

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
域名注册服务 div.story-track > div.story-slide > div.max-w-[1400px] > h3.mb-4

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●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
●`[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
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○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
○`<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
○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.
81

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 / WarningSource
Unload event listeners are deprecated and will be removed.
hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc287b440f6 line 1, col 274
●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
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
○Detected JavaScript libraries
69

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
产品与服务 nav.nav-main > ol.nav-items > li.nav-item-dropdown > a.nav-link
推广与入驻 nav.nav-main > ol.nav-items > li.nav-item-dropdown > a.nav-link
宝塔1v1安全运维服务 div.story-slide > div.home-banner-header > div.banner-btn-group > a#home-service-btn
宝塔1v1安全运维服务 div.story-slide > div.home-banner-header > div.banner-btn-group > a.flex-col

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

Content Best Practices

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.flex > div.flex > h1.xl:text-[56px] > img.ml-4 div.flex > div.flex > h1.xl:text-[56px] > img.ml-4

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

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
●robots.txt is valid

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