serebii.net

Readiness by lane

Green: serebii.net. Thin bar: Literary & Knowledge peer median.

Priority fixes for serebii.net

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

1. Priority 1 · Enable

   XML sitemap discoverable

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

   Why it matters: A sitemap helps search engines find new and updated pages, especially on large or frequently updated sites.

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

   69% of Literary & Knowledge peers do this. Limit: Only the standard location was requested, once, at the time of the check.

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

2. Priority 2 · Accelerate

   Modern image formats in use

   Observed: The homepage had 106 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   31% of Literary & Knowledge peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

3. Priority 3 · Enable

   Page language declared

   Observed: The homepage <html> element had no lang attribute.

   What to do: Set lang on the html element (for example lang="en") and on any sections in another language.

   88% of Literary & Knowledge peers do this.

   Guide: Website Accessibility Checklist for Owners

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.

   47% of Literary & Knowledge peers do this.

   Guide: CDN Guide for Website Owners

What serebii.net already does well

Practices fewer than half of Literary & Knowledge peers use.

• Nameservers spread across providersNameservers spread across more than one operator.5.8% of peers
• DMARC policy enforces quarantine or rejectDMARC policy p=reject.22% of peers
• HSTS kept for at least a yearHSTS with a 730-day max-age.28% of peers

What we saw

Homepage checked

https://www.serebii.net/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Sectigo, 396-day validity, expiring 2027-03-07

DNS operators

2 self-run or other nameserver domains

HSTS

max-age 730 days

DMARC policy

p=reject

Homepage HTML

107 KB, gzip

Images on homepage

106 (jpg 76, gif 19, png 9, svg 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 Literary & Knowledge sites

• mirkosmosa.ru67
• scarehome.com67
• searchfloor.org67
• starsunfolded.com67
• taaghche.com67

Literary & Knowledge readiness benchmark