Access dainippon-tosho.co.jp. 大日本図書｜教科書・デジタル教科書および児童書・一般書の発行

Report Summary

About Website

Welcome to dainippon-tosho.co.jp homepage info - get ready to check Dainippon Tosho best content for Japan right away, or after learning these important things about dainippon-tosho.co.jp

1890年創業の出版社です。小学校・中学校・高等専門学校向け教科書，児童書，教育書などを発行しています。

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name

value

score

weighting

FCP (First Contentful Paint)

Value9.3 s

0/100

10%

LCP (Largest Contentful Paint)

Value16.1 s

0/100

25%

SI (Speed Index)

Value21.8 s

0/100

10%

TBT (Total Blocking Time)

Value940 ms

30/100

30%

CLS (Cumulative Layout Shift)

Value0.833

4/100

15%

TTI (Time to Interactive)

Value16.2 s

5/100

10%

dainippon-tosho.co.jp

446 ms

www.dainippon-tosho.co.jp

8733 ms

gtm.js

53 ms

css2

41 ms

jquery.mCustomScrollbar.css

1046 ms

Our browser made a total of 83 requests to load all elements on the main page. We found that 80% of them (66 requests) were addressed to the original Dainippon-tosho.co.jp, 7% (6 requests) were made to Fonts.gstatic.com and 2% (2 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (12.3 sec) belongs to the original domain Dainippon-tosho.co.jp.

Content Size

1.5 MB

After Optimization

866.1 kB

In fact, the total size of Dainippon-tosho.co.jp main page is 1.5 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 739.8 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 131.4 kB

Original 166.3 kB
After minification 152.2 kB
After compression 35.0 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 131.4 kB or 79% of the original size.

Image Optimization

-5%

Potential reduce by 36.4 kB

Original 739.8 kB
After minification 703.4 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Dainippon Tosho images are well optimized though.

JavaScript Optimization

-69%

Potential reduce by 216.6 kB

Original 313.8 kB
After minification 280.2 kB
After compression 97.2 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 216.6 kB or 69% of the original size.

CSS Optimization

-89%

Potential reduce by 249.4 kB

Original 279.9 kB
After minification 207.0 kB
After compression 30.5 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Dainippon-tosho.co.jp needs all CSS files to be minified and compressed as it can save up to 249.4 kB or 89% of the original size.

Requests Now

After Optimization

The browser has sent 75 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dainippon Tosho. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 17 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

Search Engine Optimization Advices

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

High

Document uses legible font sizes

Language and Encoding

Language Detected

JA
Language Claimed

JA
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dainippon-tosho.co.jp can be misinterpreted by Google and other search engines. Our service has detected that Japanese is used on the page, and it matches the claimed language. Our system also found out that Dainippon-tosho.co.jp main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

dainippon-tosho.co.jp

Open Graph data is detected on the main page of Dainippon Tosho. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook:

Report Summary

Performance

Accessibility

Best Practices

SEO

大日本図書｜教科書・デジタル教科書および児童書・一般書の発行

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)