Website readiness profile · Snapshot 23 October 2026
classmarker.com
classmarker.com's public homepage, certificate and DNS checked against 31 practices and compared with 1,516 Education & Online Learning sites.
- Readiness index
- 80/100
- Ahead of
- 93%
- Practices observed
- 23/30
- Popularity band
- Top 50K
Education & Online Learning median 61
of measured Education & Online Learning sites
1 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: classmarker.com. Thin bar: Education & Online Learning peer median.
Enable
100/100
Peers 75
Harden
80/100
Peers 54
Accelerate
65/100
Peers 57
Recover
0/100
Peers 13
Priority fixes for classmarker.com
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
Modern image formats in use
Observed: The homepage had 52 images and none used WebP or AVIF.
Why it matters: WebP and AVIF are typically much smaller than JPEG or PNG at similar quality, and images are often the heaviest part of a page.
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.
On Cloudflare: Cloudflare Polish can convert images to WebP.
32% of Education & Online Learning peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.
Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format
Priority 2 · Accelerate
Offscreen images lazy-loaded
Observed: The homepage had 52 images and none used loading="lazy".
What to do: Add loading="lazy" to images below the fold. Do not lazy-load the main hero image, because that delays the largest visible element.
52% of Education & Online Learning peers do this.
Priority 3 · Harden
Certificate lifetime of 100 days or less
Observed: The certificate from GlobalSign nv-sa had a 199-day validity period, longer than the 100-day maximum that applies from March 2027.
What to do: Move to automated issuance and renewal now, while you still have time to test it.
60% of Education & Online Learning peers do this.
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.
On Cloudflare: Enable HTTP/3 (with QUIC) under Speed > Optimization > Protocol Optimization.
25% of Education & Online Learning peers do this.
What classmarker.com already does well
Practices fewer than half of Education & Online Learning peers use.
- DNSSEC signedDNSSEC delegation (DS record) present.8.1% of peers
- Content Security Policy presentContent-Security-Policy present.25% of peers
- Referrer-Policy setReferrer-Policy present.27% of peers
What we saw
- Homepage checked
- https://www.classmarker.com/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- GlobalSign, 199-day validity, expiring 2026-11-26
- CDN or edge
- Cloudflare
- DNS operators
- Cloudflare
- HSTS
- max-age 730 days, includeSubDomains
- DMARC policy
- p=quarantine
- Homepage HTML
- 85 KB, gzip
- Images on homepage
- 52 (png 106, svg 24)
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 7
Observed 23
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- 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
- HTML compressed
- Static files cached for 30 days or more
- No render-blocking scripts in <head>
- robots.txt published
- XML sitemap discoverable
- Reachable over IPv6
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Social preview image set
- Page language declared
- At most one redirect to the homepage
Not measured 1
- HTTP requests move to HTTPS
Own classmarker.com?
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Live status for this site: Status Is Down: classmarker.com. This profile covers configuration only.