Skip to content
https://nikkeibp.co.jp

Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
SCORE
0
GRADE
FIX
0
REVIEW
0
PASS
0
INFO
0

Detailed Report

Audit breakdown by category with detailed findings.

49

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
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_02.jpg86400.0 s209.0 KiB
www.nikkeibp.co.jp/images/www/2018/common/bgi-map_01_sp.svg?19101186400.0 s142.5 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_03.jpg86400.0 s139.7 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_04.jpg86400.0 s137.1 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_01.jpg86400.0 s123.4 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-other_01.jpg86400.0 s121.8 KiB
/signals/config/151720335485995?v=2.9.303&r=stable&domain...1200.0 s53.4 KiB
www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js86400.0 s95.3 KiB
cdn.cxense.com/cx.js3600.0 s38.1 KiB
cdn.cxense.com/cx.js3600.0 s38.1 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_01.jpg?23011886400.0 s55.8 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_02.jpg?23011886400.0 s42.5 KiB
www.nikkeibp.co.jp/js/www/2018/slick.min.js?2020082686400.0 s41.2 KiB
www.nikkeibp.co.jp/css/www/2018/index.css?25102086400.0 s24.2 KiB
www.nikkeibp.co.jp/css/www/2018/common.css?2023112286400.0 s17.9 KiB
www.nikkeibp.co.jp/css/www/2018/font/oswald-v16-latin-regular.woff286400.0 s15.1 KiB
cdn.cxense.com/cx.cce.js3600.0 s6.8 KiB
www.nikkeibp.co.jp/images/www/2018/index/ico-services_04.png86400.0 s12.6 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_06_2.png86400.0 s8.9 KiB
www.nikkeibp.co.jp/js/www/2018/index.js?202008260.0 ms3.5 KiB
www.nikkeibp.co.jp/images/www/2018/index/img-main-title_03.svg86400.0 s7.4 KiB
www.nikkeibp.co.jp/images/www/2018/index/ico-services_01.png86400.0 s7.2 KiB
www.nikkeibp.co.jp/images/www/2018/index/img-main-title_02.svg86400.0 s7.1 KiB
www.nikkeibp.co.jp/images/www/2018/index/ico-services_02.png86400.0 s6.6 KiB
www.nikkeibp.co.jp/js/bpcommon/onetag/bpTrackVarsCommon.js0.0 ms2.6 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_05.png86400.0 s6.3 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_01.png86400.0 s6.2 KiB
www.nikkeibp.co.jp/js/www/2018/common.js?202001210.0 ms2.4 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_04.png86400.0 s5.9 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_03.png86400.0 s5.8 KiB
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_02.png86400.0 s5.5 KiB
www.nikkeibp.co.jp/images/www/2018/index/ico-services_03.png86400.0 s3.8 KiB
www.nikkeibp.co.jp/js/www/2018/jquery.matchHeight-min.js86400.0 s3.5 KiB
www.nikkeibp.co.jp/js/www/2018/form.js?201812120.0 ms1.3 KiB
www.nikkeibp.co.jp/images/www/2018/index/log-main_01.svg86400.0 s2.1 KiB
www.nikkeibp.co.jp/images/bplogo/logo.svg86400.0 s2.0 KiB
www.nikkeibp.co.jp/js/bpcommon/onetag/bpTrackVars.js0.0 ms643 B
/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo98f8vkrxu7m4g4&sid=...0.0 ms413 B
www.nikkeibp.co.jp/images/www/2018/common/ico-win_01.svg?2018121086400.0 s921 B
www.nikkeibp.co.jp/images/www/2018/common/ico-arrow_01.svg86400.0 s845 B
www.nikkeibp.co.jp/css/www/2018/font.css86400.0 s601 B
/tr/?id=151720335485995&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B
/5207194079175/20220512182908_beb0d5d2fc7b112b7103bc0ac41...0.0 ms0 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.nikkeibp.co.jp/css/www/2018/font/oswald-v16-latin-regular.woff2100 ms

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-0-VIDEO
nodeLabel: div#wrap > div#topMain > div.movie > video#video
path: 1,HTML,1,BODY,0,DIV,3,DIV,1,DIV,0,VIDEO
selector: div#wrap > div#topMain > div.movie > video#video
snippet: <video src="https://d2bx7bt5963zg8.cloudfront.net/5207194079175/20220512182908_beb0d5d…" id="video" preload="none" playsinline="" muted="" autoplay="">

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.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js95.3 KiB655 ms
www.nikkeibp.co.jp/js/www/2018/index.js?202008263.5 KiB218 ms
www.nikkeibp.co.jp/js/www/2018/common.js?202001212.4 KiB
www.nikkeibp.co.jp/js/www/2018/form.js?201812121.3 KiB
www.nikkeibp.co.jp/js/www/2018/slick.min.js?2020082641.2 KiB218 ms
www.nikkeibp.co.jp/css/www/2018/font.css601 B
www.nikkeibp.co.jp/js/www/2018/jquery.matchHeight-min.js3.5 KiB
www.nikkeibp.co.jp/css/www/2018/common.css?2023112217.9 KiB
www.nikkeibp.co.jp/css/www/2018/index.css?25102024.2 KiB218 ms

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
ソリューション SOLUTION div#services > div.col2 > div.col > a
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_02.jpg208.6 KiB135.7 KiB
出版・書籍 PUBLICATION div#services > div.col2 > div.col > a
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_03.jpg139.4 KiB66.5 KiB
イベント・セミナー EVENT SEMINAR div#services > div.col2 > div.col > a
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_04.jpg136.7 KiB63.8 KiB
日経BPとは 会社概要 日経BPのあゆみ SDGs/ESG への取り組み body#top > div#wrap > div#other
www.nikkeibp.co.jp/images/www/2018/index/bgi-other_01.jpg121.5 KiB56.9 KiB
メディア MEDIA div#services > div.col2 > div.col > a
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_01.jpg123.0 KiB50.1 KiB
日経BP採用案内 ul#bnr > li > a > img.sp
www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_02.jpg?23011842.3 KiB26.3 KiB
div.col2 > div.col > a > img div.col2 > div.col > a > img
www.nikkeibp.co.jp/images/www/2018/index/ico-services_04.png12.4 KiB5.9 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: 951 ms
URLTime Spent
nikkeibp.co.jp/951 ms
www.nikkeibp.co.jp/0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Reduce unused 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: 1.1 s 247.8 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-PM8FXLP65G&cx=c&gtm=4e64h1151.7 KiB63.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-N67TT5M143.0 KiB63.2 KiB
www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js95.0 KiB48.7 KiB
www.nikkeibp.co.jp/js/www/2018/slick.min.js?2020082641.0 KiB37.8 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB34.1 KiB

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
www.nikkeibp.co.jp/1.2 s202 ms1.5 ms
Unattributable900 ms69 ms0.0 ms
www.googletagmanager.com/gtag/js?id=G-PM8FXLP65G&cx=c&gtm=4e64h1422 ms327 ms91 ms
www.googletagmanager.com/gtm.js?id=GTM-N67TT5M356 ms252 ms73 ms
/signals/config/151720335485995?v=2.9.303&r=stable&domain...301 ms272 ms28 ms
connect.facebook.net/en_US/fbevents.js219 ms146 ms67 ms
cdn.cxense.com/cx.js210 ms181 ms17 ms
img.ak.impact-ad.jp/ut/a1/tracking.min.js202 ms157 ms33 ms
www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js180 ms117 ms13 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 Evaluation1.8 s
Other1.2 s
Style & Layout618 ms
Script Parsing & Compilation342 ms
Rendering73 ms
Parse HTML & CSS38 ms

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 6.9 KiB
URLTransfer SizeEst Savings
www.nikkeibp.co.jp/css/www/2018/index.css?25102024.2 KiB3.8 KiB
www.nikkeibp.co.jp/css/www/2018/common.css?2023112217.9 KiB3.1 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 11.6 KiB
URLTransfer SizeEst Savings
www.nikkeibp.co.jp/css/www/2018/common.css?2023112217.7 KiB11.6 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
/5207194079175/20220512182908_beb0d5d2fc7b112b7103bc0ac41...10.0 MiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_02.jpg209.0 KiB
www.googletagmanager.com/gtag/js?id=G-PM8FXLP65G&cx=c&gtm=4e64h1151.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-N67TT5M143.4 KiB
www.nikkeibp.co.jp/images/www/2018/common/bgi-map_01_sp.svg?191011142.5 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_03.jpg139.7 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_04.jpg137.1 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-services_01.jpg123.4 KiB
www.nikkeibp.co.jp/images/www/2018/index/bgi-other_01.jpg121.8 KiB
connect.facebook.net/en_US/fbevents.js96.6 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
日経BP採用案内 ul#bnr > li > a > img.sp
www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_02.jpg?230118
50を超えるメディア ul > li > div.box > img
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_01.png
専門雑誌一筋50年 ul > li > div.box > img
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_02.png
930万ビジネスパーソンID ul > li > div.box > img
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_03.png
調査データアーカイブ100万本 ul > li > div.box > img
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_04.png
300人以上の専門記者 ul > li > div.box > img
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_05.png
年間約1,000回のセミナー・イベント ul > li > div.box > img
www.nikkeibp.co.jp/images/www/2018/index/bnr-data_06_2.png
div.col2 > div.col > a > img div.col2 > div.col > a > img
www.nikkeibp.co.jp/images/www/2018/index/ico-services_01.png
div.col2 > div.col > a > img div.col2 > div.col > a > img
www.nikkeibp.co.jp/images/www/2018/index/ico-services_02.png
div.col2 > div.col > a > img div.col2 > div.col > a > img
www.nikkeibp.co.jp/images/www/2018/index/ico-services_03.png
div.col2 > div.col > a > img div.col2 > div.col > a > img
www.nikkeibp.co.jp/images/www/2018/index/ico-services_04.png

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

●Layout shift culprits
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify JavaScript
●User Timing marks and measures 5 user timings
●Avoid long main-thread tasks 12 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 160 ms
●Server Backend Latencies 110 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 140 ms
○INP breakdown
○Avoid non-composited animations
○Avoid large layout shifts
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.

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-hidden="true"]` is not present on the document `<body>`
●Image elements have `[alt]` attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links 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
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
○`[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
○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
○`<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.
○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
○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
○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.
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
AttributionReporting
connect.facebook.net/en_US/fbevents.js line 279, col 769
●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 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`

Send Feedback