2026/02/10 17:12 about:blank https://slide-stg.antaa.jp/ 35 86 Performance Accessibility 69 54 Best Practices SEO There were issues affecting this run of Lighthouse: There may be stored data affecting loading performance in this location: IndexedDB. Audit this page in an incognito window to prevent those resources from affecting your scores. 35 Performance Values are estimated and may vary. The performance score is calculated directly from these metrics.See calculator. 0–49 50–89 90–100 METRICS First Contentful Paint about:blank Expand view Largest Contentful Paint 1/6
0.4 s 2026/02/10 17:12 Total Blocking Time 790 ms 2.7 s about:blank Cumulative Layout Shift 0.288 Speed Index 3.5 s Show audits relevant to: All FCP LCP TBT CLS INSIGHTS Document request latency — Est savings of 1,510 ms Legacy JavaScript — Est savings of 12 KiB Layout shift culprits Forced reflow LCP breakdown LCP request discovery Use efficient cache lifetimes — Est savings of 100 KiB Improve image delivery — Est savings of 611 KiB Duplicated JavaScript — Est savings of 19 KiB 3rd parties These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information. DIAGNOSTICS Reduce JavaScript execution time — 2.4 s about:blank 2/6
2026/02/10 17:12 about:blank Minimize main-thread work — 3.8 s Reduce unused JavaScript — Est savings of 740 KiB Page prevented back/forward cache restoration — 3 failure reasons Avoid long main-thread tasks — 13 long tasks found User Timing marks and measures — 5 user timings More information about the performance of your application. These numbers don't directly affect the Performance score. PASSED AUDITS (13) Show 86 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. NAMES AND LABELS Image elements do not have [alt] attributes Image elements do not have [alt] attributes that are redundant text. 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. CONTRAST Backgrou
2026/02/10 17:12 about:blank Identical links have the same purpose. These items highlight common accessibility best practices. ADDITIONAL ITEMS TO MANUALLY CHECK (10) Show These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review. PASSED AUDITS (20) Show NOT APPLICABLE (34) Show 69 Best Practices GENERAL Uses third-party cookies — 1 cookie found Browser errors were logged to the console Issues were logged in the Issues panel in Chrome Devtools Detected JavaScript libraries USER EXPERIENCE Displays images with incorrect aspect ratio TRUST AND SAFETY Ensure CSP is effective against XSS attacks Use a strong HSTS policy Ensure proper origin isolation with COOP about:blank 4/6
2026/02/10 17:12 about:blank Mitigate clickjacking with XFO or CSP Mitigate DOM-based XSS with Trusted Types PASSED AUDITS (9) Show NOT APPLICABLE (1) Show 54 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. CRAWLING AND INDEXING Page is blocked from indexing Links are not crawlable To appear in search results, crawlers need access to your app. CONTENT BEST PRACTICES Image elements do not have [alt] attributes Format your HTML in a way that enables crawlers to better understand your app’s content. ADDITIONAL ITEMS TO MANUALLY CHECK (1) Show Run these additional validators on your site to check additional SEO best practices. PASSED AUDITS (7) Captured at Feb 10, 2026, 5:11 PM GMT+9 about:blank Show Emulated Desktop with Lighthouse 13.0.1 Single pag
