Website readiness profile · Snapshot 23 October 2026
ck12.org
ck12.org's public homepage, certificate and DNS checked against 31 practices and compared with 1,516 Education & Online Learning sites.
- Readiness index
- 77/100
- Ahead of
- 87%
- Practices observed
- 21/29
- Popularity band
- Top 50K
Education & Online Learning median 61
of measured Education & Online Learning sites
2 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: ck12.org. Thin bar: Education & Online Learning peer median.
Enable
72/100
Peers 75
Harden
89/100
Peers 54
Accelerate
63/100
Peers 57
Recover
0/100
Peers 13
Priority fixes for ck12.org
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
Static files cached for 30 days or more
Observed: A same-site stylesheet or script was cacheable for 300 seconds, short of the 30-day benchmark.
Why it matters: Returning visitors and later page views reuse cached files instead of downloading them again.
What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.
45% of Education & Online Learning peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.
Priority 2 · Enable
Meta description written
Observed: The homepage had no meta description.
What to do: Write a short, specific description of the page for people, not a list of keywords.
84% of Education & Online Learning peers do this.
Guide: Meta Titles and Descriptions That Match Search Intent
Priority 3 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 1 external script without async or defer.
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.
42% of Education & Online Learning peers do this.
Guide: Control Third-Party Scripts Before They Control Your Page
Priority 4 · Enable
Canonical URL declared
Observed: The homepage did not declare a canonical URL.
What to do: Add a self-referencing canonical link to every indexable page, using the final https:// URL.
62% of Education & Online Learning peers do this.
What ck12.org already does well
Practices fewer than half of Education & Online Learning peers use.
- DNSSEC signedDNSSEC delegation (DS record) present.8.1% of peers
- CAA records limit who can issue certificatesCAA limits issuance to amazon.com, godaddy.com.13% of peers
- Content Security Policy presentContent-Security-Policy present.25% of peers
What we saw
- Homepage checked
- https://www.ck12.org/
- Homepage response
- HTTP 200, after 1 redirect
- TLS
- TLSv1.3, HTTP/2
- Certificate
- GoDaddy, 365-day validity, expiring 2026-12-03
- CDN or edge
- Amazon CloudFront
- DNS operators
- Amazon Route 53
- HSTS
- max-age 365 days, includeSubDomains, preload
- DMARC policy
- p=reject
- Homepage HTML
- 5 KB, gzip
- Images on homepage
- 1 (png 1)
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
Not observed 8
Observed 21
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- CAA records limit who can issue certificates
- DNSSEC signed
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- Referrer-Policy set
- HTTP/2 negotiated
- HTTP/3 advertised
- HTML compressed
- robots.txt published
- XML sitemap discoverable
- Reachable over IPv6
- Mobile viewport configured
- Structured data present
- Page language declared
- At most one redirect to the homepage
Not measured 2
- Modern image formats in use
- Offscreen images lazy-loaded
Own ck12.org?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: ck12.org. This profile covers configuration only.