yahoo.co.jp

Readiness by lane

Green: yahoo.co.jp. Thin bar: Search Engines peer median.

Priority fixes for yahoo.co.jp

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 1 external script without async or defer.

   Why it matters: A plain <script src> in the head stops the browser from showing anything until that file has downloaded and run.

   What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

   72% of Search Engines peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

   Guide: Control Third-Party Scripts Before They Control Your Page

2. Priority 2 · Harden

   HSTS kept for at least a year

   Observed: The homepage response did not include a Strict-Transport-Security header.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   30% of Search Engines peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

3. Priority 3 · Enable

   XML sitemap discoverable

   Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.

   What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.

   60% of Search Engines peers do this.

   Guide: XML Sitemap Guide: Include Only URLs You Stand Behind

4. Priority 4 · Accelerate

   HTTP/3 advertised

   Observed: The homepage did not advertise HTTP/3 through an Alt-Svc header.

   What to do: Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.

   37% of Search Engines peers do this.

   Guide: CDN Guide for Website Owners

What yahoo.co.jp already does well

Practices fewer than half of Search Engines peers use.

• CAA records limit who can issue certificatesCAA limits issuance to cybertrust.ne.jp, digicert.com, globalsign.com.37% of peers
• X-Content-Type-Options: nosniffnosniff header present.44% of peers

What we saw

Homepage checked

https://www.yahoo.co.jp/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Cybertrust Japan Co., Ltd., 198-day validity, expiring 2027-02-21

DNS operators

1 self-run or other nameserver domain

DMARC policy

p=quarantine

Homepage HTML

34 KB, br

Images on homepage

1 (jpg 2)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Search Engines sites

• azet.sk65
• coccoc.com64
• hitta.se69
• paginebianche.it68
• shuru.co.in68

Search Engines readiness benchmark