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coronasha.co.jp screenshot

Report Summary

  • 100

    Performance

    Renders faster than
    97% of other websites

  • 59

    Accessibility

    Visual factors better than
    that of 26% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 58

    SEO

    Google-friendlier than
    21% of websites

coronasha.co.jp

コロナ社 科学技術と共に歩む

Page Load Speed

1.6 sec in total

First Response

524 ms

Resources Loaded

1 sec

Page Rendered

66 ms

coronasha.co.jp screenshot

About Website

Visit coronasha.co.jp now to see the best up-to-date Coronasha content for Japan and also check out these interesting facts you probably never knew about coronasha.co.jp

科学技術と共に歩む 自然科学関連の専門書籍を発行している出版社です。新刊・近刊・コロナ社からのお知らせ，教科書採用者向け・法人様向け・書店様向けなど充実した書籍に関する情報をお届けします。

Visit coronasha.co.jp

Key Findings

We analyzed Coronasha.co.jp page load time and found that the first response time was 524 ms and then it took 1.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Performance Metrics

coronasha.co.jp performance score

100

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value0.6 s

100/100

10%

LCP (Largest Contentful Paint)

Value0.6 s

100/100

25%

SI (Speed Index)

Value1.0 s

100/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value0.6 s

100/100

10%

Network Requests Diagram

coronasha.co.jp

524 ms

back.jpg

168 ms

left.jpg

488 ms

right.jpg

335 ms

Our browser made a total of 4 requests to load all elements on the main page. We found that all of those requests were addressed to Coronasha.co.jp and no external sources were called. The less responsive or slowest element that took the longest time to load (524 ms) belongs to the original domain Coronasha.co.jp.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.5 kB (5%)

Content Size

30.7 kB

After Optimization

29.2 kB

  • HTML
  • Images

In fact, the total size of Coronasha.co.jp main page is 30.7 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only 5% of websites need less resources to load. Images take 28.7 kB which makes up the majority of the site volume.

HTML Optimization

-67%

Potential reduce by 1.3 kB

  • Original 1.9 kB
  • After minification 1.7 kB
  • After compression 630 B

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. This page needs HTML code to be minified as it can gain 270 B, which is 14% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 1.3 kB or 67% of the original size.

Image Optimization

-1%

Potential reduce by 193 B

  • Original 28.7 kB
  • After minification 28.5 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. Coronasha images are well optimized though.

Requests Breakdown

We found no issues to fix!

Requests Now

3

After Optimization

3

  • Images

The browser has sent 3 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Coronasha. According to our analytics all requests are already optimized.

Network Requests Diagram

coronasha.co.jp

coronasha.co.jp

524 ms

back.jpg

back.jpg

168 ms

left.jpg

left.jpg

488 ms

right.jpg

right.jpg

335 ms

Accessibility Review

coronasha.co.jp accessibility score

59

Accessibility Issues

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Names and labels

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.

Impact

Issue

High

Image elements do not have [alt] attributes

Best Practices

coronasha.co.jp best practices score

58

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

SEO Factors

coronasha.co.jp SEO score

58

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    JA

  • Language Claimed

    N/A

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Coronasha.co.jp can be misinterpreted by Google and other search engines. Our service has detected that Japanese is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Coronasha.co.jp main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

coronasha.co.jp

Open Graph description is not detected on the main page of Coronasha. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: