Impress.co.jp 株式会社インプレス
impress.co.jp Desktop Performance
85/100
These metrics represent real-world Chrome users experience viewing impress.co.jp web page. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
First Input Delay
First Contentful Paint
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Cumulative Layout Shift48/100 0.258
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Speed Index64/100 2.0 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint78/100 1.6 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint96/100 0.8 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Time to Interactive97/100 1.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time100/100 10 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Should Fix (14)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Serve images in next-gen formats
Potential savings of 1,667 KiB
1,520 ms
Avoid multiple page redirects
Potential savings of 380 ms
380 ms
Properly size images
Potential savings of 237 KiB
200 ms
Enable text compression
Potential savings of 154 KiB
120 ms
Eliminate render-blocking resources
Potential savings of 120 ms
118 ms
Remove unused JavaScript
Potential savings of 42 KiB
80 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Does not use passive listeners to improve scrolling performance
Serve static assets with an efficient cache policy
32 resources found
Avoid enormous network payloads
Total size was 2,800 KiB
Avoid large layout shifts
2 elements found
Avoid chaining critical requests
5 chains found
Avoid long main-thread tasks
3 long tasks found
Keep request counts low and transfer sizes small
52 requests • 2,800 KiB
Largest Contentful Paint element
1 element found
Passed Audits (15)
Minify JavaScript
Avoids an excessive DOM size
249 elements
Minimizes main-thread work
1.0 s
Minify CSS
Potential savings of 2 KiB
Efficiently encode images
Preconnect to required origins
Initial server response time was short
Root document took 480 ms
JavaScript execution time
0.4 s
Defer offscreen images
Remove unused CSS
Preload key requests
Use video formats for animated content
Minimize third-party usage
Third-party code blocked the main thread for 40 ms
Avoids `document.write()`
All text remains visible during webfont loads
impress.co.jp Desktop SEO
82/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (2)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Image elements do not have `[alt]` attributes
Document does not have a meta description
Passed Audits (9)
Links have descriptive text
Document has a valid `hreflang`
Document avoids plugins
Document has a `<title>` element
robots.txt is valid
Page isn’t blocked from indexing
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page has successful HTTP status code
Links are crawlable
impress.co.jp Desktop Best Practices
69/100
These checks highlight opportunities to improve the overall code health of impress.co.jp page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (4)
User Experience
Displays images with incorrect aspect ratio
Trust and Safety
Links to cross-origin destinations are unsafe
Includes front-end JavaScript libraries with known security vulnerabilities
3 vulnerabilities detected
Does not use HTTPS
2 insecure requests found
Passed Audits (10)
Page has the HTML doctype
Serves images with appropriate resolution
Allows users to paste into password fields
Avoids requesting the geolocation permission on page load
Avoids Application Cache
Avoids deprecated APIs
Detected JavaScript libraries
No browser errors logged to the console
Avoids requesting the notification permission on page load
Properly defines charset
impress.co.jp Desktop Progressive Web App
19/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (10)
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 12.1 s
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
PWA Optimized
Does not provide a valid `apple-touch-icon`
Manifest doesn't have a maskable icon
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
Installable
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Does not use HTTPS
2 insecure requests found
Passed Audits (3)
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
impress.co.jp Desktop Accessibility
62/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (11)
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
ARIA input fields do not have accessible names
Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children.
`[aria-hidden="true"]` elements contain focusable descendents
`[aria-*]` attributes do not match their roles
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.
Image elements do not have `[alt]` attributes
`<frame>` or `<iframe>` elements do not have a title
Links do not have a discernible name
Tables and lists
These are opportunities to to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Best practices
These items highlight common accessibility best practices.
`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
Passed Audits (14)
`<html>` element has a `[lang]` attribute
`[role]` values are valid
Document has a `<title>` element
ARIA IDs are unique
`[aria-*]` attributes have valid values
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
The page contains a heading, skip link, or landmark region
`[role]`s have all required `[aria-*]` attributes
Buttons have an accessible name
No element has a `[tabindex]` value greater than 0
`[aria-*]` attributes are valid and not misspelled
`<html>` element has a valid value for its `[lang]` attribute
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s are contained by their required parent element
Desktop Speed
69/100
These checks analyze the performance of impress.co.jp on desktop devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (7)
Leverage browser caching
Enable compression
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Optimize images
Minify CSS
Minify HTML
Passed Audits (3)
Reduce server response time
Minify JavaScript
Prioritize visible content
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