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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.

28

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
asset.fwpub1.com/js/embed-feed.js1800.0 s118.2 KiB
code.piano.io/api/tinypass.min.js14400.0 s132.4 KiB
cdn.mainichi.jp/vol1/images/v2/sp/index/bnr_podcast_sp.webp0.0 ms86.2 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.4 KiB
c.amazon-adsystem.com/aax2/apstag.js3600.0 s90.9 KiB
cdn.mainichi.jp/vol1/images/v2/sp/index/bnr_medical.webp0.0 ms70.1 KiB
cdn.mainichi.jp/vol1/2022/10/10/20221010hpr00m010002000q/10.webp?10.0 ms69.0 KiB
cdn.mainichi.jp/vol1/2023/08/24/20230824hpr00m040002000q/10.webp?10.0 ms61.6 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040328000p/0c10.webp?10.0 ms53.2 KiB
cdn.mainichi.jp/vol1/2025/12/23/20251223hpr00m040002000q/10.webp?10.0 ms49.0 KiB
anymind360.com/js/8523/ats.js1200.0 s52.9 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040141000p/0c7.jpg?10.0 ms44.6 KiB
/signals/config/990943682127685?v=2.9.298&r=stable&domain...1200.0 s44.4 KiB
cdn.mainichi.jp/vol1/libs/v2/jquery-3.6.4.min.js0.0 ms31.0 KiB
scdn.cxense.com/cx.js3600.0 s38.1 KiB
cdn.cxense.com/cx.js3600.0 s38.1 KiB
cdn.cxense.com/cx.js3600.0 s38.1 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415ddm001070137000p/0c7.jpg?10.0 ms30.4 KiB
asset.fwpub1.com/js/chunks/fwn/5789-98da68aaeeb0cb2772dc.js1800.0 s21.9 KiB
dmp.im-apps.net/sdk/log.2.js5410.0 s22.7 KiB
cdn.webpush.jp/js/pushone.js0.0 ms15.3 KiB
/signals/config/1771352443188203?v=2.9.298&r=stable&domai...1200.0 s16.0 KiB
cdn.webpush.jp/js/thirdparty/firebase.11.0.2.js0.0 ms13.3 KiB
asset.fwpub1.com/js/chunks/fwn/1657-94117e39298f2fec788d.js1800.0 s15.3 KiB
cdn.adjust.com/adjust-smart-banner-latest.min.js3600.0 s13.9 KiB
s.yimg.jp/images/listing/tool/cv/ytag.js600.0 s11.8 KiB
scripts.clarity.ms/0.8.60-beta/clarity.js86400.0 s25.0 KiB
cdn.mainichi.jp/vol1/css/v2/sp/module_top_sp.min.css?202412020.0 ms7.2 KiB
cdn.mainichi.jp/vol1/2026/04/16/20260416s10041000097000p/0c3.webp?10.0 ms6.1 KiB
asset.fwpub1.com/js/chunks/fwn/4649-902be6faf8ee9da262fa.js1800.0 s6.7 KiB
cdn.mainichi.jp/vol1/2026/04/10/20260410k0000m040312000p/0c3.webp?20.0 ms5.6 KiB
asset.fwpub1.com/js/chunks/fwn/1092-a7c9dc530ac13b355767.js1800.0 s6.3 KiB
scdn.cxense.com/cx.cce.js3600.0 s6.8 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040288000p/0c3.webp?10.0 ms5.1 KiB
asset.fwpub1.com/js/chunks/fwn/2389-4b7e1b3d3181136aff21.js1800.0 s5.9 KiB
cdn.mainichi.jp/vol1/images/v2/common/img_noimage_144.png0.0 ms5.0 KiB
cdn.cxense.com/track_banners_init.js3600.0 s6.3 KiB
cdn.mainichi.jp/vol1/2026/04/16/20260416ddm004070114000p/0c3.webp?20.0 ms5.0 KiB
cdn.mainichi.jp/vol1/images/v2/common/logo_mainichi_zukai.jpg0.0 ms4.8 KiB
asset.fwpub1.com/js/chunks/fwn/2878-fd463ccd505005b3228e.js1800.0 s5.5 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040141000p/0c3.webp?10.0 ms4.7 KiB
cdn.mainichi.jp/vol1/2026/04/16/20260416s10041000093000p/0c3.webp?10.0 ms4.6 KiB
cdn.mainichi.jp/vol1/2026/04/16/20260416ddm001070110000p/0c3.webp?10.0 ms4.6 KiB
asset.fwpub1.com/js/chunks/fwn/2373-b25119322a28e974963d.js1800.0 s5.0 KiB
cdn.mainichi.jp/vol1/images/v2/common/logo.svg0.0 ms4.3 KiB
cdn.mainichi.jp/vol1/css/v2/sp/common_sp.min.css?202410010.0 ms3.9 KiB
asset.fwpub1.com/js/assets/2756875147bf6e7de183f725c308c631.png1800.0 s4.5 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m030034000p/0c3.webp?10.0 ms3.7 KiB
cdn.mainichi.jp/vol1/images/v2/common/logo_hanasone.png0.0 ms3.6 KiB
csm.cxpublic.com/Mainichi/domain/mainichi.jp.js?20260415233600.0 s4.5 KiB
csm.cxpublic.com/Mainichi.js3600.0 s4.4 KiB
cdn.mainichi.jp/vol1/2026/04/14/20260414k0000m030006000p/0c3.webp?20.0 ms3.5 KiB
asset.fwpub1.com/js/chunks/fwn/2044-814fafba44f1e627f929.js1800.0 s4.0 KiB
cdn.mainichi.jp/vol1/css/v2/sp/index_sp.min.css?202512020.0 ms3.4 KiB
cdn.mainichi.jp/vol1/2026/04/13/20260413k0000m030157000p/0c3.webp?10.0 ms3.3 KiB
cdn.smartnews-ads.com/i/pixel.js150.0 s3.3 KiB
cdn.mainichi.jp/vol1/2026/04/16/20260416s10041000099000p/0c3.webp?10.0 ms2.9 KiB
cdn.mainichi.jp/vol1/2026/04/16/20260416ddm005070108000p/0c3.webp?10.0 ms2.8 KiB
cdn.mainichi.jp/vol1/2026/04/13/20260413k0000m030158000p/0c3.webp?10.0 ms2.8 KiB
asset.fwpub1.com/js/chunks/fwn/5720-157308b8334b29ea9266.js1800.0 s3.1 KiB
cdn.mainichi.jp/vol1/2026/04/16/20260416ddm005070109000p/0c3.webp?10.0 ms2.7 KiB
cdn.mainichi.jp/vol1/images/v2/pc/index/icon_member_privilege.svg0.0 ms2.4 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040020000p/0c3.webp?10.0 ms2.4 KiB
experience-ap.piano.io/xbuilder/experience/load?aid=gmsPBEZtpj1800.0 s2.6 KiB
cdn.mainichi.jp/vol1/js/v2/sp/script_top_sp.min.js?2023100.0 ms2.2 KiB
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m030184000p/0c3.webp?10.0 ms2.1 KiB
asset.fwpub1.com/js/chunks/fwn/2942-1c8cfe05a4ac0997ea15.js1800.0 s2.3 KiB
www.npttech.com/advertising.js28800.0 s3.0 KiB
cdn.opecloud.com/ope-mediaconsortium.js604800.0 s17.7 KiB
cdn.mainichi.jp/vol1/libs/v2/jquery.cookie.js0.0 ms1.7 KiB
cdn.mainichi.jp/vol1/2026/04/14/20260414k0000m030210000p/0c3.webp?10.0 ms1.6 KiB
asset.fwpub1.com/js/chunks/fwn/1647-2f17fe8bb1a9883373ed.js1800.0 s1.7 KiB
asset.fwpub1.com/js/chunks/fwn/8098-e261125af6e167d1c686.js1800.0 s1.6 KiB
cdn.mainichi.jp/vol1/libs/v2/lazyload.min.js0.0 ms1.3 KiB
asset.fwpub1.com/js/chunks/fwn/8740-0c731e7855ea1d5b07c2.js1800.0 s1.4 KiB
dmp.im-apps.net/js/1014416/0001/itm.js10957.0 s1.5 KiB
cdn.mainichi.jp/vol1/images/v2/common/icon_key.svg0.0 ms1.0 KiB
d.line-scdn.net/n/line_tag/public/release/v1/lt.js2107307.0 s10.1 KiB
asset.fwpub1.com/js/chunks/fwn/1155-143f41f853f41762b025.js1800.0 s1.1 KiB
cdn.mainichi.jp/vol1/images/v2/common/icon_close_popup.svg0.0 ms805 B
/coins_webapi/fcm/setting/fe40d9e1c0637bd2ff56caa27db29d0...0.0 ms734 B
cdn.mainichi.jp/vol1/images/v2/sp/plus_gnav.svg0.0 ms680 B
cdn.mainichi.jp/vol1/images/v2/common/icon_close.svg0.0 ms658 B
asset.fwpub1.com/js/chunks/fwn/i18next-6ea18556f38fdf7a81e7.js1800.0 s761 B
cdn.mainichi.jp/vol1/images/v2/sp/arrow_gnav.svg0.0 ms647 B
cdn.mainichi.jp/vol1/images/v2/common/arrow_blue.svg0.0 ms646 B
config.aps.amazon-adsystem.com/configs/36773600.0 s791 B
/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo0o9aphqha66l42&sid=...0.0 ms411 B
/p?id=1c439b70d8e6b38d597dc905&t=1776295133&url=https%3A%...0.0 ms225 B
/tr/?id=990943682127685&ev=PageView&dl=https%3A%2F%2Fmain...0.0 ms16 B
/tr/?id=1771352443188203&ev=PageView&dl=https%3A%2F%2Fmai...0.0 ms16 B
/tr/?id=990943682127685&ev=MyCustomEvent&dl=https%3A%2F%2...0.0 ms16 B
/tr/?id=1771352443188203&ev=MyCustomEvent&dl=https%3A%2F%...0.0 ms16 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.

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:161.105 source:map[column:449 line:19 type:source-location url:/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.WQSjKtkEYiM.es5.O/d=1/exm=kernel_loader,loader_js_executable/ed=1/rs=AJlcJMwIx8fty2eKv_YgAn45g2tx1JaJ2w/m=web_iab_tcf_v2_wall_executable 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
毎日新聞PODCAST div.mb-36 > a > picture > img
cdn.mainichi.jp/vol1/images/v2/sp/index/bnr_podcast_sp.webp85.7 KiB55.7 KiB
a > div.featurelist-image > picture > img.is-webp a > div.featurelist-image > picture > img.is-webp
cdn.mainichi.jp/vol1/2022/10/10/20221010hpr00m010002000q/10.webp?168.6 KiB47.0 KiB
a > div.featurelist-image > picture > img.is-webp a > div.featurelist-image > picture > img.is-webp
cdn.mainichi.jp/vol1/2023/08/24/20230824hpr00m040002000q/10.webp?161.1 KiB39.5 KiB
毎日メディカル div.mb-36 > a > picture > img
cdn.mainichi.jp/vol1/images/v2/sp/index/bnr_medical.webp69.7 KiB34.5 KiB
夜遅く京都府警亀岡署の前に集まる報道陣=京都府亀岡市で2026年4月15日午後9時57分、渡部直樹撮影 div.toppickup-item > div.toppickup-image > picture > img.is-webp
cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040328000p/0c10.webp?152.8 KiB33.7 KiB
a > div.featurelist-image > picture > img.is-webp a > div.featurelist-image > picture > img.is-webp
cdn.mainichi.jp/vol1/2025/12/23/20251223hpr00m040002000q/10.webp?148.6 KiB27.1 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:1172.9899990234376 label:Time to first byte subpart:timeToFirstByte] map[duration:12.4790009765625 label:Resource load delay subpart:resourceLoadDelay] map[duration:888.307 label:Resource load duration subpart:resourceLoadDuration] map[duration:862.304 label:Element render delay subpart:elementRenderDelay]]
lhId: page-4-IMG
nodeLabel: 夜遅く京都府警亀岡署の前に集まる報道陣=京都府亀岡市で2026年4月15日午後9時57分、渡部直樹撮影
path: 1,HTML,1,BODY,8,DIV,1,DIV,4,DIV,0,DIV,1,DIV,0,SECTION,1,DIV,0,A,0,DIV,0,DIV,0,PICTURE,1,IMG
selector: div.toppickup-item > div.toppickup-image > picture > img.is-webp
snippet: <img class="is-webp" src="https://cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040328000p/0c10.webp…" width="1200" height="630" alt="夜遅く京都府警亀岡署の前に集まる報道陣=京都府亀岡市で2026年4月15日午後9時57分、渡部直樹撮影">

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-4-IMG
nodeLabel: 夜遅く京都府警亀岡署の前に集まる報道陣=京都府亀岡市で2026年4月15日午後9時57分、渡部直樹撮影
path: 1,HTML,1,BODY,8,DIV,1,DIV,4,DIV,0,DIV,1,DIV,0,SECTION,1,DIV,0,A,0,DIV,0,DIV,0,PICTURE,1,IMG
selector: div.toppickup-item > div.toppickup-image > picture > img.is-webp
snippet: <img class="is-webp" src="https://cdn.mainichi.jp/vol1/2026/04/15/20260415k0000m040328000p/0c10.webp…" width="1200" height="630" alt="夜遅く京都府警亀岡署の前に集まる報道陣=京都府亀岡市で2026年4月15日午後9時57分、渡部直樹撮影">

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.

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

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

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.0 s
URLTime Spent
mainichi.jp/1.1 s

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

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.

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
mainichi.jp/2.9 s757 ms6.8 ms
asset.fwpub1.com/js/embed-feed.js1.1 s901 ms27 ms
Unattributable1.1 s227 ms0.0 ms
/f/AGSKWxVO8SEyWnXXEYluBpxdps0MFAu79xK97Ed-QJPaHL29cJ46P6...891 ms161 ms37 ms
asset.fwpub1.com/js/chunks/fwn/8740-0c731e7855ea1d5b07c2.js674 ms649 ms0.3 ms
www.googletagmanager.com/gtm.js?id=GTM-5M48NC495 ms405 ms53 ms
www.googletagmanager.com/gtag/js?id=G-TWF4RDH5YQ&cx=c&gtm=4e64e1&bs=ctrl422 ms339 ms39 ms
/pagead/managed/js/gpt/m202604100101/pubads_impl.js380 ms323 ms43 ms
c.amazon-adsystem.com/aax2/apstag.js315 ms273 ms25 ms
anymind360.com/js/8523/prebid_2026_2_20_8_25_13.js302 ms242 ms41 ms
code.piano.io/api/tinypass.min.js243 ms190 ms32 ms
scripts.clarity.ms/0.8.60-beta/clarity.js231 ms181 ms7.7 ms
/ats-modules/6e46d34f-f300-4ffe-89b4-2ff37b5e7be9/ats.js224 ms163 ms59 ms
scdn.cxense.com/cx.js220 ms135 ms39 ms
fundingchoicesmessages.google.com/i/41213723?ers=3165 ms148 ms15 ms
www.googletagmanager.com/gtm.js?id=GTM-KX3Q99SS&l=itm_dl1_1014416158 ms126 ms28 ms
connect.facebook.net/en_US/fbevents.js153 ms88 ms25 ms
/signals/config/1771352443188203?v=2.9.298&r=stable&domai...118 ms99 ms7.9 ms
/gtag/destination?id=AW-350911520&cx=c&gtm=4e64e1&bs=ctrl110 ms83 ms27 ms
/signals/config/990943682127685?v=2.9.298&r=stable&domain...109 ms96 ms13 ms
csm.cxpublic.com/Mainichi/domain/mainichi.jp.js?2026041523102 ms97 ms1.1 ms
www.npttech.com/advertising.js96 ms70 ms1.0 ms
cdn.mainichi.jp/vol1/libs/v2/jquery-3.6.4.min.js64 ms47 ms10.0 ms
static.ads-twitter.com/uwt.js60 ms48 ms11 ms
securepubads.g.doubleclick.net/tag/js/gpt.js58 ms50 ms7.9 ms
anymind360.com/js/8523/ats.js57 ms37 ms18 ms
cdn.treasuredata.com/sdk/3.1/td.min.js56 ms51 ms4.7 ms
asset.fwpub1.com/js/chunks/fwn/2878-fd463ccd505005b3228e.js52 ms51 ms1.0 ms
asset.fwpub1.com/js/chunks/fwn/5789-98da68aaeeb0cb2772dc.js51 ms42 ms5.2 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation7.1 s
Style & Layout2.4 s
Other1.2 s
Script Parsing & Compilation680 ms
Rendering252 ms
Garbage Collection181 ms
Parse HTML & CSS125 ms

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 14.1 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.

div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img
div.topmember-item > div.topmember-item-inner > div.topmember-image > img div.topmember-item > div.topmember-item-inner > div.topmember-image > img

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
Minify CSS
Minify JavaScript
User Timing marks and measures 15 user timings
Avoid long main-thread tasks 20 long tasks found
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 270 ms
Server Backend Latencies 1,120 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Avoid multiple page redirects
Avoid large layout shifts 1 layout shift found
INP breakdown
Avoid non-composited animations
86

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

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
トップニュース ul.maintab-list > li.is-active > span > button
最新記事 ul.maintab-list > li > span > button
ランキング ul.maintab-list > li > span > button
緊迫する中東情勢 ul.maintab-list > li > span > button
高市政権の行方 ul.maintab-list > li > span > button

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 > div.l-container > div.global-header > button#openmenu body > div.l-container > div.global-header > button#openmenu
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open div.gnav-inner > ul.gnav-list > li.gnav-list-item > button.gnav-list-submenu-open
div#pi-sp-all-popup > div.popuppanel > div.popuppanel4 > button.popuppanel-close div#pi-sp-all-popup > div.popuppanel > div.popuppanel4 > button.popuppanel-close

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
4/16 01:52 div.toppickup-item > div.toppickup-detail > div.articletag > span.articletag-date
4/15 20:39 div.articlelist-item > div.articlelist-detail > div.articletag > span.articletag-date
4/16 06:00 div.articlelist-item > div.articlelist-detail > div.articletag > span.articletag-date

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
京都・南丹の男児死亡 死体遺棄の疑いで逮捕の父親、容疑認める a > div.toppickup-item > div.toppickup-detail > h3.toppickup-title

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
`[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
`<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
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
Touch targets have sufficient size and spacing.
Document has a main landmark.
Deprecated ARIA roles were not used
Uses ARIA roles only on compatible elements
Identical links have the same purpose.
Elements with visible text labels have matching accessible names.
`[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 an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
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
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.
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.
73

Best Practices

Trust and Safety

Users are mistrustful of or confused by sites that request to send notifications without context. Consider tying the request to user gestures instead. Learn more about responsibly getting permission for notifications.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
Topics
AttributionReporting

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
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Access to fetch at 'https://hb.adingo.jp/prebid?dfpUnitCode=%2F41213723%2FSP%2Farticle%2Fsticky&tagId=44217%3A1000299604&groupId=1000188809' from origin 'https://mainichi.jp' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Access to fetch at 'https://hb.adingo.jp/prebid?dfpUnitCode=%2F41213723%2FSP%2Fchannel%2Fbanner1&tagId=44217%3A1000299502&groupId=1000188809' from origin 'https://mainichi.jp' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Access to fetch at 'https://hb.adingo.jp/prebid?dfpUnitCode=%2F41213723%2FSP%2Fchannel%2Fsticky&tagId=44217%3A1000299501&groupId=1000188809' from origin 'https://mainichi.jp' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Access to fetch at 'https://hb.adingo.jp/prebid?dfpUnitCode=%2F41213723%2FSP%2Ftop%2Fbanner1&tagId=44217%3A1000299499&groupId=1000188809' from origin 'https://mainichi.jp' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Access to fetch at 'https://hb.adingo.jp/prebid?dfpUnitCode=%2F41213723%2FSP%2Ftop%2Frec1&tagId=44217%3A1000299605&groupId=1000188809' from origin 'https://mainichi.jp' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Access to fetch at 'https://hb.adingo.jp/prebid?dfpUnitCode=%2F41213723%2FSP%2Ftop%2Frec2&tagId=44217%3A1000299603&groupId=1000188809' from origin 'https://mainichi.jp' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Access to fetch at 'https://hb.adingo.jp/prebid?dfpUnitCode=%2F41213723%2FSP%2Ftop%2Fsticky&tagId=44217%3A1000299500&groupId=1000188809' from origin 'https://mainichi.jp' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Attestation check for Protected Audience on https://grid-bidder.criteo.com failed.
Attestation check for Protected Audience on https://hbopenbid.pubmatic.com failed.
Attestation check for Protected Audience on https://htlb.casalemedia.com failed.
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: net::ERR_FAILED
Failed to load resource: the server responded with a status of 451 ()
ReferenceError: gtag is not defined at <anonymous>:1:1 at f.ba (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:239:229) at f.ka (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:238:427) at f.Y (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:236:407) at f.F (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:234:445) at f.write (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:234:70) at f (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:241:215) at e (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:240:279) at q.streams (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:242:30) at d (https://www.googletagmanager.com/gtm.js?id=GTM-5M48NC:973:303)
Uncaught [object Object]
Uses HTTPS
Avoids third-party cookies
Allows users to paste into input fields
Avoids requesting the geolocation permission on page load
Displays images with correct aspect ratio
Serves images with appropriate resolution
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
100

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.

Structured data is valid
Page isn’t blocked from indexing
Document has a `<title>` element
Document has a meta description
Page has successful HTTP status code
Links have descriptive text
Links are crawlable
robots.txt is valid
Image elements have `[alt]` attributes
Document has a valid `hreflang`
Document has a valid `rel=canonical`

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