Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
www.189.cn/images/2024/9/25/000000002164D997C28D4925B5372797E3E6798A.png	86400.0 s	819.6 KiB
www.189.cn/images/2024/9/25/00000000E1EDC7CD7F7245B59B1D9C8E19638BA3.png	86400.0 s	739.5 KiB
www.189.cn/images/2024/9/25/00000000A12050CCBB8E4BB8872CAFD4ED9171D1.png	86400.0 s	494.2 KiB
www.189.cn/images/2024/9/25/00000000B8FDE08814194F6F839F6AFB6708CF7A.png	86400.0 s	404.3 KiB
www.189.cn/wapportalweb/vue/pages/static/css/chunk-vendors.12780cbf.css	7200.0 s	53.1 KiB
www.189.cn/wapportalweb/vue/pages/static/js/7088.d6f1ba4a.js	7200.0 s	43.2 KiB
www.189.cn/client/wapportalweb/vue_common/js/vue/2.6.11/vue.min.js	7200.0 s	38.7 KiB
www.189.cn/wapportalweb/vue/pages/static/js/download.e9de6ed1.js	7200.0 s	38.2 KiB
www.189.cn/images/2024/9/25/000000002315B65EE71F4337ABB4CAACF7390075.jpg	86400.0 s	50.2 KiB
bigdata-behaviordata.189.cn:9002/chinatelecom/autotrack.js	0.0 ms	11.5 KiB
www.189.cn/client/wapportalweb/vue_common/js/vue-router/3.2.0/vue-router.min.js	7200.0 s	10.8 KiB
www.189.cn/images/2022/11/25/00000000CA9D45537C994D8CA9616D0339C06BC4.png	86400.0 s	16.3 KiB
www.189.cn/wap/ct-web-reporter.min.js	7200.0 s	8.0 KiB
www.189.cn/client/wapportalweb/vue_common/js/axios/0.20.0/axios.min.js	7200.0 s	5.8 KiB
www.189.cn/client/wap/common/js/aes.js	7200.0 s	5.5 KiB
res-behaviordata.189.cn/chinatelecom/chinatelecom.min.js	604800.0 s	39.4 KiB
www.189.cn/images/2024/9/25/00000000C1E98F740B4E45AEADBFB1C5A619578C.png	86400.0 s	9.1 KiB
www.189.cn/client/wapportalweb/vue_common/js/conscript.js	7200.0 s	3.7 KiB
www.189.cn/wapportalweb/vue/pages/static/css/download.539ec8b5.css	7200.0 s	3.6 KiB
www.189.cn/client/wapportalweb/vue_common/js/rems.js	7200.0 s	1.0 KiB

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.430564] map[node:map[boundingRect:map[bottom:612 height:354 left:0 right:412 top:258 width:412] lhId:page-5-DIV nodeLabel:div.ui-panel-wrapper > div.all_cc > div.all_dl > div.swiper-container path:1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV selector:div.ui-panel-wrapper > div.all_cc > div.all_dl > div.swiper-container snippet:<div data-v-091fe668="" class="swiper-container container swiper-container-initialized swiper-container-h…"> type:node] score:0.430564 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:258 height:171 left:143 right:269 top:87 width:126] lhId:page-4-IMG nodeLabel:div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic path:1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,IMG selector:div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic snippet:<img data-v-091fe668="" src="https://www.189.cn/images/2022/11/25/00000000CA9D45537C994D8CA9616D0339C06…" class="all_logo_pic"> type:node]]] type:subitems]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/000000002164D997C28D4925B5372797E3E6798A.png	818.3 KiB	792.1 KiB
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/00000000E1EDC7CD7F7245B59B1D9C8E19638BA3.png	738.2 KiB	712.0 KiB
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/00000000A12050CCBB8E4BB8872CAFD4ED9171D1.png	493.3 KiB	467.1 KiB
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/00000000B8FDE08814194F6F839F6AFB6708CF7A.png	403.5 KiB	377.3 KiB
div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic `div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic`	www.189.cn/images/2022/11/25/00000000CA9D45537C994D8CA9616D0339C06BC4.png	15.9 KiB	5.2 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:259.449 label:Time to first byte subpart:timeToFirstByte] map[duration:1873.901 label:Resource load delay subpart:resourceLoadDelay] map[duration:664.618 label:Resource load duration subpart:resourceLoadDuration] map[duration:38.556 label:Element render delay subpart:elementRenderDelay]]

lhId: page-2-IMG

nodeLabel: div.swiper-container > div.swiper-wrapper > div.swipe_slide > img

path: 1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,2,DIV,0,IMG

selector: div.swiper-container > div.swiper-wrapper > div.swipe_slide > img

snippet: <img data-v-091fe668="" src="https://www.189.cn/images/2024/9/25/00000000A12050CCBB8E4BB8872CAFD4ED9171…" alt="">

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-2-IMG

nodeLabel: div.swiper-container > div.swiper-wrapper > div.swipe_slide > img

path: 1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,2,DIV,0,IMG

selector: div.swiper-container > div.swiper-wrapper > div.swipe_slide > img

snippet: <img data-v-091fe668="" src="https://www.189.cn/images/2024/9/25/00000000A12050CCBB8E4BB8872CAFD4ED9171…" alt="">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
res-behaviordata.189.cn/chinatelecom/chinatelecom.min.js	39.4 KiB	991 ms
bigdata-behaviordata.189.cn:9002/chinatelecom/autotrack.js	11.5 KiB	1.2 s
www.189.cn/client/wap/common/js/aes.js	5.5 KiB
www.189.cn/client/wapportalweb/vue_common/js/vue-router/3.2.0/vue-router.min.js	10.8 KiB	150 ms
www.189.cn/client/wapportalweb/vue_common/js/axios/0.20.0/axios.min.js	5.8 KiB
www.189.cn/client/wapportalweb/vue_common/js/conscript.js	3.7 KiB	150 ms
www.189.cn/client/wapportalweb/vue_common/js/vue/2.6.11/vue.min.js	38.7 KiB	600 ms
www.189.cn/client/wapportalweb/vue_common/js/rems.js	1.0 KiB
www.189.cn/wapportalweb/vue/pages/static/css/download.539ec8b5.css	3.6 KiB
www.189.cn/wapportalweb/vue/pages/static/css/chunk-vendors.12780cbf.css	53.1 KiB	600 ms
www.189.cn/wap/ct-web-reporter.min.js	8.0 KiB	150 ms

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: 2.5 s

URL	Time Spent
189.cn/	757 ms
www.189.cn/	928 ms
a.189.cn/xiazai?channelid=129	780 ms
www.189.cn/client/wap/wapproject/newwap/download/index.html	0.0 ms
www.189.cn/wapportalweb/vue/pages/download/index.html	0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
div.ui-panel-wrapper > div.all_cc > div.all_dl > div.swiper-container `div.ui-panel-wrapper > div.all_cc > div.all_dl > div.swiper-container`	0.431

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: 180 ms 52.1 KiB

URL	Transfer Size	Est Savings
www.189.cn/wapportalweb/vue/pages/static/css/chunk-vendors.12780cbf.css	52.7 KiB	52.1 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: 180 ms 24.7 KiB

URL	Transfer Size	Est Savings
www.189.cn/wapportalweb/vue/pages/static/js/7088.d6f1ba4a.js	42.8 KiB	24.7 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 reason	Failure type
The page has an unload handler in the main frame.	Actionable

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
www.189.cn/images/2024/9/25/000000002164D997C28D4925B5372797E3E6798A.png	819.6 KiB
www.189.cn/images/2024/9/25/00000000E1EDC7CD7F7245B59B1D9C8E19638BA3.png	739.5 KiB
www.189.cn/images/2024/9/25/00000000A12050CCBB8E4BB8872CAFD4ED9171D1.png	494.2 KiB
www.189.cn/images/2024/9/25/00000000B8FDE08814194F6F839F6AFB6708CF7A.png	404.3 KiB
www.189.cn/wapportalweb/vue/pages/static/css/chunk-vendors.12780cbf.css	53.1 KiB
www.189.cn/images/2024/9/25/000000002315B65EE71F4337ABB4CAACF7390075.jpg	50.2 KiB
www.189.cn/wapportalweb/vue/pages/static/js/7088.d6f1ba4a.js	43.2 KiB
res-behaviordata.189.cn/chinatelecom/chinatelecom.min.js	39.4 KiB
www.189.cn/client/wapportalweb/vue_common/js/vue/2.6.11/vue.min.js	38.7 KiB
www.189.cn/wapportalweb/vue/pages/static/js/download.e9de6ed1.js	38.2 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/00000000E1EDC7CD7F7245B59B1D9C8E19638BA3.png
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/00000000A12050CCBB8E4BB8872CAFD4ED9171D1.png
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/000000002164D997C28D4925B5372797E3E6798A.png
div.swiper-container > div.swiper-wrapper > div.swipe_slide > img `div.swiper-container > div.swiper-wrapper > div.swipe_slide > img`	www.189.cn/images/2024/9/25/00000000B8FDE08814194F6F839F6AFB6708CF7A.png
div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic `div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic`	www.189.cn/images/2022/11/25/00000000CA9D45537C994D8CA9616D0339C06BC4.png
div.all_cc > div.all_dl > div.all_btn > img.all_open_btn `div.all_cc > div.all_dl > div.all_btn > img.all_open_btn`	www.189.cn/images/2024/9/25/00000000C1E98F740B4E45AEADBFB1C5A619578C.png

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

●Max Potential First Input Delay 130 ms

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●JavaScript execution time 0.4 s

●Minimizes main-thread work 1.3 s

●Avoid long main-thread tasks 4 long tasks found

●Network Requests

●Network Round Trip Times 180 ms

●Server Backend Latencies 80 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 250 ms

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

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.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These are opportunities to improve the interpretation of your content by users in different locales.

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.all_cc > div.all_dl > div.all_logo > img.all_logo_pic `div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic`
div.all_cc > div.all_dl > div.all_btn > img.all_open_btn `div.all_cc > div.all_dl > div.all_btn > img.all_open_btn`

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

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

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-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

○`[accesskey]` values are unique

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

○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

○`[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

○Buttons have an accessible name

○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

○Heading elements appear in a sequentially-descending order

○`<html>` element has a valid value for its `[lang]` attribute

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○Links are distinguishable without relying on color.

○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

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○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.

○`<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.

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

General

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	bigdata-behaviordata.189.cn:9002/chinatelecom/chinatelecom.min.js

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.all_cc > div.all_dl > div.all_logo > img.all_logo_pic `div.all_cc > div.all_dl > div.all_logo > img.all_logo_pic`
div.all_cc > div.all_dl > div.all_btn > img.all_open_btn `div.all_cc > div.all_dl > div.all_btn > img.all_open_btn`

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

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●Document has a valid `hreflang`

○robots.txt is valid

○Document has a valid `rel=canonical`