Website readiness profile · Snapshot 23 October 2026
coursera.org
coursera.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
- 20/30
- Popularity band
- Top 5K
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: coursera.org. Thin bar: Education & Online Learning peer median.
Enable
95/100
Peers 75
Harden
69/100
Peers 54
Accelerate
76/100
Peers 57
Recover
0/100
Peers 13
Priority fixes for coursera.org
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
Offscreen images lazy-loaded
Observed: The homepage had 34 images and none used loading="lazy".
Why it matters: Images below the fold are only downloaded when the visitor scrolls near them, which frees bandwidth for what is visible first.
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. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.
Priority 2 · Harden
Certificate lifetime of 100 days or less
Observed: The certificate from Amazon had a 197-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 3 · 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 Amazon CloudFront: Select HTTP/3 in the distribution's supported HTTP versions.
25% of Education & Online Learning peers do this.
Priority 4 · Harden
Content Security Policy present
Observed: The homepage response did not include a Content-Security-Policy header.
What to do: Start with Content-Security-Policy-Report-Only to see what would break, tighten the policy over a few weeks, then enforce it.
25% of Education & Online Learning peers do this.
Guide: Payment Security and PCI DSS: What Website Owners Need to Know
What coursera.org already does well
Practices fewer than half of Education & Online Learning peers use.
- Modern image formats in useWebP or AVIF images detected.32% of peers
- HSTS kept for at least a yearHSTS with a 365-day max-age covering subdomains.34% of peers
- DMARC policy enforces quarantine or rejectDMARC policy p=reject.36% of peers
What we saw
- Homepage checked
- https://www.coursera.org/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Amazon, 197-day validity, expiring 2027-03-08
- CDN or edge
- Amazon CloudFront
- DNS operators
- Amazon Route 53
- HSTS
- max-age 365 days, includeSubDomains, preload
- DMARC policy
- p=reject
- Homepage HTML
- 769 KB, gzip
- Images on homepage
- 34 (png 92, jpg 12, svg 10)
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 10
Observed 20
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- HTTP/2 negotiated
- HTML compressed
- Modern image formats in use
- No render-blocking scripts in <head>
- robots.txt published
- XML sitemap discoverable
- 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
- Static files cached for 30 days or more
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Live status for this site: Status Is Down: coursera.org. This profile covers configuration only.