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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

86

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.

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
value: No additional origins are good candidates for preconnecting

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.google-analytics.com/analytics.js7200.0 s20.9 KiB
www.4.cn/js/front/jquery.min.js86400.0 s31.8 KiB
www.4.cn/img/en/phone_2x.jpg86400.0 s27.0 KiB
www.4.cn/img/en/logo_2x.png86400.0 s19.6 KiB
www.4.cn/img/style.css86400.0 s12.6 KiB
www.4.cn/img/basic.gif86400.0 s9.1 KiB
www.4.cn/img/btn.gif86400.0 s7.2 KiB
www.4.cn/js/front/jquery.flexslider-min.js86400.0 s5.4 KiB
www.4.cn/img/banana.gif86400.0 s4.9 KiB
www.4.cn/js/front/punycode.js86400.0 s4.7 KiB
www.4.cn/img/gradient-bg.gif86400.0 s4.2 KiB
www.4.cn/img/index.css86400.0 s4.1 KiB
www.4.cn/img/en/entrust-buy-tit-en.png86400.0 s4.1 KiB
www.4.cn/img/num.gif86400.0 s3.9 KiB
www.4.cn/img/account.png86400.0 s3.1 KiB
www.4.cn/img/fenge.png86400.0 s2.9 KiB
www.4.cn/img/award/icann.png86400.0 s2.7 KiB
www.4.cn/js/static/gt.js86400.0 s2.6 KiB
www.4.cn/img/award/dp.gif86400.0 s2.2 KiB
www.4.cn/img/award/pl.gif86400.0 s2.0 KiB
www.4.cn/js/front/css/images/bg_direction_nav.png86400.0 s2.0 KiB
www.4.cn/img/award/jb.gif86400.0 s1.9 KiB
www.4.cn/js/front/jquery.dialog.min.js86400.0 s1.8 KiB
www.4.cn/js/front/jquery.index.min.js86400.0 s1.8 KiB
www.4.cn/js/front/css/jquery.dialog.css86400.0 s1.7 KiB
www.4.cn/img/en/style.css86400.0 s1.7 KiB
www.4.cn/js/front/css/jquery.flexslider.css86400.0 s1.5 KiB
www.4.cn/js/front/jquery.cxscroll.min.js86400.0 s1.2 KiB
www.4.cn/img/html5-reset.css86400.0 s1.1 KiB
www.4.cn/js/front/jquery.duomai.min.js86400.0 s1.1 KiB
s141.cnzz.com/stat.php?id=853703&web_id=85370390.0 s370 B
www.4.cn/img/reset.css86400.0 s790 B
www.4.cn/js/front/locale/index-en.js86400.0 s541 B
www.4.cn/img/flag/twitter.gif86400.0 s529 B
www.4.cn/img/flag/facebook.gif86400.0 s523 B
www.4.cn/img/grey-list-ul-bg.gif86400.0 s367 B
www.4.cn/js/front/locale/dialog-en.min.js86400.0 s345 B

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
body > div#header > div.logo > a.phone body > div#header > div.logo > a.phone
www.4.cn/img/en/phone_2x.jpg26.8 KiB22.1 KiB
body > div#header > div.logo > h1 body > div#header > div.logo > h1
www.4.cn/img/en/logo_2x.png19.4 KiB6.6 KiB

Tap interactions may be delayed by up to 300 ms if the viewport is not optimized for mobile.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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: 1.2 s
URLTime Spent
4.cn/1.2 s
www.4.cn/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

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.

Diagnostics

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 cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not actionable

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 2.9 KiB
URLTransfer SizeEst Savings
www.4.cn/js/front/punycode.js4.5 KiB2.9 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: 0.0 ms 11.1 KiB
URLTransfer SizeEst Savings
www.4.cn/img/style.css12.5 KiB11.1 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: 0.0 ms 63.9 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-9PR2G0XLTH&cx=c&_slc=1145.7 KiB63.9 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#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/icann.png
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/jb.gif
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/dp.gif
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/pl.gif
div.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
www.4.cn/img/flag/facebook.gif
div.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
www.4.cn/img/flag/twitter.gif

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
Forced reflow
LCP breakdown
Modern HTTP
Minify CSS
Avoids enormous network payloads Total size was 357 KiB
User Timing marks and measures 5 user timings
JavaScript execution time 0.3 s
Minimizes main-thread work 1.2 s
Avoid long main-thread tasks 3 long tasks found
Avoid non-composited animations 7 animated elements found
Network Requests
Network Round Trip Times 200 ms
Server Backend Latencies 10 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 330 ms
Avoid large layout shifts 2 layout shifts found
INP breakdown
LCP request discovery
62

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.

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
Welcome to 4.CN Sign In Create an account body > div#top > div.wrapper > div.fl
Sign In div#top > div.wrapper > div.fl > a.orange
Create an account div#top > div.wrapper > div.fl > a.orange
Top Domains div#top > div.wrapper > div.fr > a.orange
Fee Policies div#top > div.wrapper > div.fr > a
Help Center div#top > div.wrapper > div.fr > a
Contact Us div#top > div.wrapper > div.fr > a
div.search-wrap > form#handleSearch > div.search-text-container > input#keyword div.search-wrap > form#handleSearch > div.search-text-container > input#keyword
BIN Sales div#nav > ul.fl > li > a.buynow-item
Bulk Sales div#nav > ul.fl > li > a.bulk-item
Hot Sales div#nav > ul.fl > li > a.hotsale-item
Live Auction div#nav > ul.fl > li > a.auction-item
Buy Domains div#nav > ul.fl > li > a.buy-domains-item
Sell Domains div#nav > ul.fl > li > a.sell-domains-item
Escrow div#nav > ul.fl > li > a.escrow-item
More >> div.gray-head > h2.head-h2 > span.fr > a.more
Category div.body > ol.list > li.cap > span.category
Listing Price div.body > ol.list > li.cap > span.price
Shopping div.body > ol.list > li > span.category
make offer div.body > ol.list > li > span.price
¥420,000 CNY div.body > ol.list > li > span.price
Uncategoried div.body > ol.list > li > span.category
make offer div.body > ol.list > li > span.price
Acronyms div.body > ol.list > li > span.category
$31,888 USD div.body > ol.list > li > span.price
Computers div.body > ol.list > li > span.category
make offer div.body > ol.list > li > span.price
Category div.body > ol.list > li.cap > span.category
Listing Price div.body > ol.list > li.cap > span.price
Uncategoried div.body > ol.list > li > span.category
make offer div.body > ol.list > li > span.price
Business div.body > ol.list > li > span.category
make offer div.body > ol.list > li > span.price
Uncategoried div.body > ol.list > li > span.category
make offer div.body > ol.list > li > span.price
Uncategoried div.body > ol.list > li > span.category
¥300,000 CNY div.body > ol.list > li > span.price
Uncategoried div.body > ol.list > li > span.category
make offer div.body > ol.list > li > span.price
div.login > form#index_login > div.ftext-wrap > input#username div.login > form#index_login > div.ftext-wrap > input#username
div.login > form#index_login > div.ftext-wrap > input#password div.login > form#index_login > div.ftext-wrap > input#password
Sign In form#index_login > p > button.sub-btn > span
Create an account div.login > form#index_login > p > a.reg_btn
div.entrust-box > dl.clearfix > dd > input.domain-name div.entrust-box > dl.clearfix > dd > input.domain-name
div.entrust-box > dl.clearfix > dd > input.budget div.entrust-box > dl.clearfix > dd > input.budget
I have an account dl.clearfix > dd > label > span
I am a new customer dl.clearfix > dd > label > span
dl.clearfix > dd#loginForm > div.ftext-wrap > input dl.clearfix > dd#loginForm > div.ftext-wrap > input
dl.clearfix > dd#loginForm > div.ftext-wrap > input dl.clearfix > dd#loginForm > div.ftext-wrap > input
Brokerage form#applybrokerage > div.entrust-box > p > a#submit
Time Left div.body > ol#closing_auctions > li.cap > span.time
Current Bid div.body > ol#closing_auctions > li.cap > span.price
Listing Price div.body > ol#featured_hotsale > li.cap > span.price
浙公网安备 33010402000519号 div.wrap > div > a > p

These are opportunities to improve the legibility of your content.

Names and labels

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.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
div.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img

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
div.search-wrap > form#handleSearch > div.search-text-container > input#keyword div.search-wrap > form#handleSearch > div.search-text-container > input#keyword
div.login > form#index_login > div.ftext-wrap > input#username div.login > form#index_login > div.ftext-wrap > input#username
div.login > form#index_login > div.ftext-wrap > input#password div.login > form#index_login > div.ftext-wrap > input#password
div.entrust-box > dl.clearfix > dd > input.domain-name div.entrust-box > dl.clearfix > dd > input.domain-name
div.entrust-box > dl.clearfix > dd > input.budget div.entrust-box > dl.clearfix > dd > input.budget
dl.clearfix > dd#loginForm > div.ftext-wrap > input dl.clearfix > dd#loginForm > div.ftext-wrap > input

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
CNY USD EUR div.entrust-box > dl.clearfix > dd > select#BudgetCurrency

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > div#footer > div.wrap > iframe body > div#footer > div.wrap > iframe

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
body > div#footer > div.wrap > a
body > div#footer > div.wrap > a
body > div#footer > div.wrap > a
body > div#footer > div.wrap > a

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

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

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-hidden="true"]` is not present on the document `<body>`
Buttons have an accessible name
`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Definition list items are wrapped in `<dl>` elements
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
Touch targets have sufficient size and spacing.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Heading elements appear in a sequentially-descending order
`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Identical links have the same purpose.
Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
`[accesskey]` values are unique
`[aria-*]` attributes match their roles
`button`, `link`, and `menuitem` elements have accessible names
ARIA attributes are used as specified for the element's role
Deprecated ARIA roles were not used
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 use only permitted ARIA attributes
`[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
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
`[aria-*]` attributes have valid values
`[aria-*]` attributes are valid and not misspelled
The page contains a heading, skip link, or landmark region
ARIA IDs are unique
No form fields have multiple labels
Input buttons have discernible text.
`<input type="image">` elements have `[alt]` text
Links are distinguishable without relying on color.
The document does not use `<meta http-equiv="refresh">`
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`<object>` elements have alternate text
Skip links are focusable.
No element has a `[tabindex]` value greater than 0
`[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.
`<td>` elements in a large `<table>` have one or more table headers.
92

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLDisplayed sizeActual sizeExpected size
Web site recommended by Domaining.com div#footer > div.wrap > a > img
partner.domaining.com/Award/domaining-120x31.gif120 x 31120 x 31180 x 47
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/icann.png55 x 5555 x 5583 x 83
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/jb.gif44 x 3844 x 3866 x 57
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/dp.gif39 x 3839 x 3859 x 57
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
www.4.cn/img/award/pl.gif38 x 3838 x 3857 x 57
div.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
www.4.cn/img/flag/facebook.gif15 x 1515 x 1523 x 23
div.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
www.4.cn/img/flag/twitter.gif15 x 1515 x 1523 x 23

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
Failed to load resource: net::ERR_NAME_NOT_RESOLVED
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
Page has the HTML doctype
Properly defines charset
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 clickjacking with XFO or CSP
Mitigate DOM-based XSS with Trusted Types
Detected JavaScript libraries
Page has valid source maps
Redirects HTTP traffic to HTTPS
50

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 are unable to include your pages in search results if they don't have permission to crawl them. Learn more about crawler directives.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Blocking Directive Source
https://www.4.cn/robots.txt

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
Brokerage form#applybrokerage > div.entrust-box > p > a#submit

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.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
div.fr > span.nav-tool > a > img div.fr > span.nav-tool > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img
div#footer > div.wrap > a > img div#footer > div.wrap > a > img

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

Structured data is valid
Document has a `<title>` element
Document has a meta description
Page has successful HTTP status code
Links have descriptive text
robots.txt is valid
Document has a valid `hreflang`
Document has a valid `rel=canonical`

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