cesa.or.jp

https://cesa.or.jp· First analyzed 29 Apr 2026· Updated 29 Apr 2026

Export

cesa.or.jp

Mobile

Sponsored

Hosting Provider

SAKURA Internet Inc.

IP Address

133.125.30.136

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS7684

Server

Nginx

Nameservers

skydns12.otsuka-office365.jp.skydns13.otsuka-office365.jp.skydns11.otsuka-office365.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

2.0 s10%

Speed Index

2.6 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3.4 MB

52 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

SAKURA Internet Inc.

Technology Stack

9 Technologies Detected

Analytics

Libraries

UI Components

CSS Frameworks

Icon Libraries

Fonts

Tag Managers

Web Servers

SEO Analysis

D53/100

Meta Tags7/15

Content9/12

Headings3/8

Technical15/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile1/4

Indexability3/3

cesa.or.jpcesa.or.jp

CESA：一般社団法人コンピュータエンターテインメント協会

健全にゲームを遊ぶための研究・啓発活動、各種ガイドラインの策定、ゲーム白書の発刊などを行い、東京ゲームショウや開発者会議などを開催し、業界全体で様々な活動に取り組んでいます。

Title Length29 chars

Recommended: 50-60 chars (~179px / 580px)

Description Length87 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

11 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

555 URLs

robots.txt

2 rules

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D47/100

Bot Access

20/25

Machine Read.

13/25

Schema Data

0/25

Citation

14/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txtinvalid

llms-full.txt

Semantic HTML

Heading Hierarchy

def. listsnavheader/footer

Text ratio:4%

Words:244

Token eff.:Too Short

Sections/1K:8.2

Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary136w

Descriptive Headingsavg 1w

Canonical URL

Open Graph3/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

70/100

Passed

Critical

Warnings

Images & Alt Text

10/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

20/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

3 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

6/100

433 mg

CO₂e / view

3.4 MB

Page Weight

15%

Cleaner Than

New Visitor

495 mg

Returning (cached)

248 mg

Annual (10K/mo)

52.0 kg

Emission Segments

Data Center

97 mg

Network

104 mg

Device

233 mg

Resource Breakdown

JavaScript

44.5 KB

Images

3.1 MB

CSS

211.3 KB

Fonts

641 B

HTML

54.9 KB

Other

8.1 KB

Green Hosting Not Verified

SAKURA Internet Inc.

8 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

21%Critical

Interactive

HTTPS

No WAF

86d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

26.04.2026

Valid Until

25.07.2026

Subject Alternative Names (2)

cesa.or.jpwww.cesa.or.jp

SHA-256 Fingerprint

3F:E3:03:33:0A:CF:0B:6F:95:05:72:86:BB:35:89:4E:C1:6B:60:94...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

content-length

55922

content-type

text/html

date

Wed, 29 Apr 2026 10:34:37 GMT

server

nginx

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

MX Records (1)

cesa-or-jp.mail.protection.outlook.com

Domain Information

cesa.or.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

54/100

Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1.0, minimum-scale=1.0

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Century Gothic

WCAG AAA

79/100

Readability

/30

20/30

14px · LH 1.50

Hierarchy

/20

18/20

2.29x ratio · ✓ H1→H6

WCAG

/25

20/25

8.59:1 min contrast

Performance

/25

21/25

System fonts

Heading Font

Century Gothic

Sans32px

Body Font

Century Gothic

Sans14px

Contrast Ratio

8.59:1

WCAG AAA (≥7:1)

Reading Comfort

~44 CPL

Narrow lines

32px

58px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 8.6:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 2.3x larger than body text.

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

GGoogle Fonts Buy on MyFonts

Color Palette

11 unique colors

2.41:1 Fail Dark

#4c5253

Text· 16.8%

#0e0f10

Text· 8.6%

#faf8f9

Primary· 24.5%

#2c2223

Text· 9.7%

#f6dc81

Accent· 8.8%

#b18e4b

Secondary· 7.9%

#d8c177

Accent· 7.3%

#fbefab

Accent· 5.7%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cse.google.com(4)googletagmanager.com(2)google.com(2)ajax.googleapis.com(1)local(1)

Website Identity

cesa.or.jp

Location detected: 🇯🇵 Japanvia tld

📧 Microsoft 365ja

Sponsored

Last analyzed: 29 Apr 2026 at 10:35

Historical Analysis & Change Tracking