C — https://blog.jp | BeaverCheck Audit

Site Health

Score: 72 / 100

Based on 8 categories, 0 sections

Fast site — your users get a smooth experience.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Solid SEO basics — a few optimizations could boost rankings.

Good server performance with room for optimization.

Mostly compliant — a few items need attention.

Good content signals with minor gaps.

Lean and efficient — low environmental impact per visit.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Amazon Route 53 · 975 peers

You 72

Avg 72

At average

0 50 100

Better than 35% of Amazon Route 53 sites See full Amazon Route 53 benchmark →

Google Search Console · 3591 peers

You 72

Avg 73

At average

0 50 100

Better than 33% of Google Search Console sites See full Google Search Console benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

Cookie 'ldblog_u' is missing the Secure flag

Security gaps expose your site and users to attacks, eroding trust.

Security › Cookie Security

HSTS header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

1 image(s) missing alt attribute

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Alt Text Quality

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fblog.jp)](https://beavercheck.com/results/cfb261ab-ca05-4cbc-afab-188e855c7a84)

HTML

<a href="https://beavercheck.com/results/cfb261ab-ca05-4cbc-afab-188e855c7a84"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fblog.jp" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fblog.jp

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.

4 security gaps detected — browsers may warn visitors about your site.

1 accessibility issue excludes users who rely on assistive technology.

Conversion Barriers

7 warning

7 barrier(s) likely increasing bounce by ~20%.

Speed (1)

Page loads in 3.2s

+5% bounce

Every additional 100ms above 2.5s costs conversions — you're 656ms over

Fix: Target <2.5s LCP: defer non-critical scripts and optimize the hero image

Trust (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Usability (1)

Viewport disables user zoom

+2% bounce

Visitors with low vision can't read the page — and some jurisdictions treat this as a legal risk

Fix: Remove user-scalable=no; drop maximum-scale if it's below 2

Content (2)

No structured data

+2% bounce

No rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices

Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)

Thin content

+3% bounce

Under 300 words — visitors bounce looking for substance, search engines rank competitors first

Fix: Add a substantive FAQ, product detail, or case-study section

Navigation (1)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

¥28,000 investment → ¥128,521/month returns

Payback period: < 1 month First-year ROI: +5408%

Investment

¥28,000

4h · 5 findings

Monthly returns

¥128,521 /mo

~¥1,542,257 / year

Conversions recovered ¥128,512
Bandwidth savings ¥9.94

Regulatory risk avoided

No applicable regulations in this jurisdiction

Payback period

0 12mo 24mo

¥16,000 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

¥28,000

3.5 developer hours at ¥8000/hr

Based on Japan rates (¥8000/hr)

Quick wins

¥16,000 4 fixes in ~120 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

¥ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

¥9.94 / month at risk

~¥119 / year if left unfixed

Bandwidth Waste

¥9.94 /mo

832.4 MB/mo × 11.940 JPY/GB

Optimize transfer: save ~83 KB per page load
Saves ¥9.94/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.56 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.16 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.56 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.16 s

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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
pdn.adingo.jp/p.js	600.0 s	20.7 KiB
parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp.png	604800.0 s	77.7 KiB
parts.blog.livedoor.jp/blog_portal/lite/css/v3/main.css?v=20240325	604800.0 s	45.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/iphone_02.png	604800.0 s	43.6 KiB
parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_android.png	604800.0 s	11.4 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/download_android.png	604800.0 s	5.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/h2_bg.svg	604800.0 s	5.3 KiB
parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_ios.png	604800.0 s	5.1 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/download_ios.png	604800.0 s	4.2 KiB
parts.blog.livedoor.jp/img/common/logo_w.svg	604800.0 s	3.8 KiB
parts.blog.livedoor.jp/img/common/logo.svg	604800.0 s	3.6 KiB
parts.blog.livedoor.jp/img/common/logo_posted_app.png	604800.0 s	3.4 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_07.svg	604800.0 s	3.2 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_01.svg	604800.0 s	2.9 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_04.svg	604800.0 s	2.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_03.svg	604800.0 s	2.4 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_02.svg	604800.0 s	1.8 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_06.svg	604800.0 s	1.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/parts_01.svg	604800.0 s	1.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_05.svg	604800.0 s	1.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/parts_02.svg	604800.0 s	1.4 KiB

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.left > div.img_3 > span > img `div.left > div.img_3 > span > img`	parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp.png	77.3 KiB	59.8 KiB
div.right > div.download > span.img_6 > img `div.right > div.download > span.img_6 > img`	parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/iphone_02.png	43.2 KiB	33.2 KiB
div.ldapp > a > span.img > img `div.ldapp > a > span.img > img`	parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_android.png	11.1 KiB	8.6 KiB
Google Playで手に入れよう `div.download-inner > span > a > img`	parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/download_android.png	5.2 KiB	4.0 KiB

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

value: No additional origins are good candidates for preconnecting

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
parts.blog.livedoor.jp/blog_portal/lite/css/v3/main.css?v=20240325	45.5 KiB	1.1 s

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

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: 150 ms 44.0 KiB

URL	Transfer Size	Est Savings
parts.blog.livedoor.jp/blog_portal/lite/css/v3/main.css?v=20240325	45.2 KiB	44.0 KiB

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

●Time to Interactive 3.2 s

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 20 ms

●Minify CSS

●Minify JavaScript

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 271 KiB

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.5 s

●Avoid long main-thread tasks 1 long task found

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 260 ms

●Server Backend Latencies 20 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 260 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

○Avoid large layout shifts

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
TOP `div.guide-title > div.pan > span > a`
blog.jp `div.box > div.right > ul.list_1 > li`
diary.to `div.box > div.right > ul.list_1 > li`
officialblog.jp `div.box > div.right > ul.list_1 > li`
livedoor `div.sitemap > ul > li > a`
© livedoor `div.footer-inner > div.box > p.copy > small`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
TOP `div.guide-title > div.pan > span > a`

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.ldapp > a > span.img > img `div.ldapp > a > span.img > img`

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.box > div.right > div.ldapp > a `div.box > div.right > div.ldapp > a`
div.box > div.right > div.ldapp > a `div.box > div.right > div.ldapp > 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

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

Performance issues directly impact user engagement and conversion rates.

Failing Elements
head > meta `head > meta`

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
livedoor `div.sitemap > ul > li > a`
利用規約 `div.sitemap > ul > li > a`
ガイドライン `div.sitemap > ul > li > a`
サイトマップ `div.sitemap > ul > li > a`
プライバシー `div.sitemap > ul > li > a`
ヘルプ `div.sitemap > ul > li > a`

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>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●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

●Heading elements appear in a sequentially-descending order

●Deprecated ARIA roles were not used

○`[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

○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

○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

○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

○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

○`<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

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
div.ldapp > a > span.img > img `div.ldapp > a > span.img > img`	parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_ios.png	175 x 56 (3.13)	524 x 193 (2.72)

●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

●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

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

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

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.ldapp > a > span.img > img `div.ldapp > a > span.img > img`

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●Document has a valid `hreflang`

○robots.txt is valid

○Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.21 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.29 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.21 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.29 s

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.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

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
pdn.adingo.jp/p.js	600.0 s	20.7 KiB
parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp.png	604800.0 s	77.7 KiB
parts.blog.livedoor.jp/blog_portal/lite/css/v3/main.css?v=20240325	604800.0 s	45.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/iphone_02.png	604800.0 s	43.6 KiB
parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_android.png	604800.0 s	11.4 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/download_android.png	604800.0 s	5.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/h2_bg.svg	604800.0 s	5.3 KiB
parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_ios.png	604800.0 s	5.1 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/download_ios.png	604800.0 s	4.2 KiB
parts.blog.livedoor.jp/img/common/logo_w.svg	604800.0 s	3.8 KiB
parts.blog.livedoor.jp/img/common/logo.svg	604800.0 s	3.6 KiB
parts.blog.livedoor.jp/img/common/logo_posted_app.png	604800.0 s	3.4 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_07.svg	604800.0 s	3.2 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_01.svg	604800.0 s	2.9 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_04.svg	604800.0 s	2.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_03.svg	604800.0 s	2.4 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_02.svg	604800.0 s	1.8 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_06.svg	604800.0 s	1.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/parts_01.svg	604800.0 s	1.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/icon_05.svg	604800.0 s	1.5 KiB
parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/parts_02.svg	604800.0 s	1.4 KiB

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.left > div.img_3 > span > img `div.left > div.img_3 > span > img`	parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp.png	77.3 KiB	71.6 KiB
div.right > div.download > span.img_6 > img `div.right > div.download > span.img_6 > img`	parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/iphone_02.png	43.2 KiB	39.9 KiB
div.ldapp > a > span.img > img `div.ldapp > a > span.img > img`	parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_android.png	11.1 KiB	10.3 KiB
div.ldapp > a > span.img > img `div.ldapp > a > span.img > img`	parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_ios.png	4.8 KiB	4.3 KiB
Google Playで手に入れよう `div.download-inner > span > a > img`	parts.blog.livedoor.jp/blog_portal/pc/img/v3/guide/download_android.png	5.2 KiB	4.0 KiB

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.

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

value: No additional origins are good candidates for preconnecting

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
parts.blog.livedoor.jp/blog_portal/lite/css/v3/main.css?v=20240325	45.5 KiB	297 ms

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

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: 40 ms 44.0 KiB

URL	Transfer Size	Est Savings
parts.blog.livedoor.jp/blog_portal/lite/css/v3/main.css?v=20240325	45.2 KiB	44.0 KiB

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.3 s

●Max Potential First Input Delay 20 ms

●Minify CSS

●Minify JavaScript

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 271 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.1 s

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 250 ms

●Server Backend Latencies 20 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 260 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

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
TOP `div.guide-title > div.pan > span > a`
blog.jp `div.box > div.right > ul.list_1 > li`
diary.to `div.box > div.right > ul.list_1 > li`
officialblog.jp `div.box > div.right > ul.list_1 > li`
livedoor `div.sitemap > ul > li > a`
© livedoor `div.footer-inner > div.box > p.copy > small`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
TOP `div.guide-title > div.pan > span > a`

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.ldapp > a > span.img > img `div.ldapp > a > span.img > img`

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.box > div.right > div.ldapp > a `div.box > div.right > div.ldapp > a`
div.box > div.right > div.ldapp > a `div.box > div.right > div.ldapp > 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

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

Performance issues directly impact user engagement and conversion rates.

Failing Elements
head > meta `head > meta`

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
livedoor `div.sitemap > ul > li > a`
利用規約 `div.sitemap > ul > li > a`
ガイドライン `div.sitemap > ul > li > a`
サイトマップ `div.sitemap > ul > li > a`
プライバシー `div.sitemap > ul > li > a`
ヘルプ `div.sitemap > ul > li > a`

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>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●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

●Heading elements appear in a sequentially-descending order

●Deprecated ARIA roles were not used

○`[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

○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

○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

○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

○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

○`<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

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
div.ldapp > a > span.img > img `div.ldapp > a > span.img > img`	parts.blog.livedoor.jp/blog_portal/lite/img/v3/guide/ldapp_ios.png	175 x 56 (3.13)	524 x 193 (2.72)

●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

●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

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

SEO

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.ldapp > a > span.img > img `div.ldapp > a > span.img > img`

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●Document has a valid `hreflang`

○robots.txt is valid

○Document has a valid `rel=canonical`

Results for https://blog.jp

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

Quick Wins

Strategic

Easy Improvements

Deprioritize

What fixing these means

Conversion Barriers

Speed (1)

Trust (2)

Usability (1)

Content (2)

Navigation (1)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Payback period

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Bandwidth Waste

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Contrast

Names and labels

Best practices

Best Practices

User Experience

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Contrast

Names and labels

Best practices

Best Practices

User Experience

SEO

Content Best Practices

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