Website readiness profile · Snapshot 23 October 2026
commonlit.org
commonlit.org's public homepage, certificate and DNS checked against 31 practices and compared with 1,516 Education & Online Learning sites.
- Readiness index
- 81/100
- Ahead of
- 94%
- Practices observed
- 20/27
- Popularity band
- Top 5K
Education & Online Learning median 61
of measured Education & Online Learning sites
4 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: commonlit.org. Thin bar: Education & Online Learning peer median.
Enable
90/100
Peers 75
Harden
84/100
Peers 54
Accelerate
74/100
Peers 57
Recover
0/100
Peers 13
Priority fixes for commonlit.org
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 2 external scripts 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.
42% 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: Control Third-Party Scripts Before They Control Your Page
Priority 2 · 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.
Priority 3 · Harden
X-Content-Type-Options: nosniff
Observed: The homepage response did not include X-Content-Type-Options: nosniff.
What to do: Send X-Content-Type-Options: nosniff on all responses and make sure each file is served with the correct Content-Type.
On Cloudflare: Add the header with a response header transform rule.
46% of Education & Online Learning peers do this.
Priority 4 · Enable
Structured data present
Observed: The homepage had no JSON-LD structured data.
What to do: Add JSON-LD for your organization and main content types, then test it with Google's Rich Results Test.
41% of Education & Online Learning peers do this.
What commonlit.org already does well
Practices fewer than half of Education & Online Learning peers use.
- security.txt publishedsecurity.txt with a contact found.5% of peers
- DNSSEC signedDNSSEC delegation (DS record) present.8.1% of peers
- Content Security Policy presentContent-Security-Policy present.25% of peers
What we saw
- Homepage checked
- https://www.commonlit.org/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Let's Encrypt, 89-day validity, expiring 2027-01-02
- CDN or edge
- Cloudflare
- Platform or framework
- Webflow
- DNS operators
- Cloudflare
- HSTS
- max-age 365 days, includeSubDomains, preload
- DMARC policy
- p=quarantine
- Homepage HTML
- 280 KB, br
- Images on homepage
- 97 (avif 119, svg 35, png 34, jpg 4)
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 20
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- Certificate lifetime of 100 days or less
- DNSSEC signed
- security.txt published
- DMARC policy enforces quarantine or reject
- Framing restricted
- Content Security Policy present
- HTTP/2 negotiated
- HTML compressed
- Modern image formats in use
- Offscreen images lazy-loaded
- Reachable over IPv6
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Social preview image set
- Page language declared
- At most one redirect to the homepage
Not measured 4
- HTTP requests move to HTTPS
- Static files cached for 30 days or more
- robots.txt published
- XML sitemap discoverable
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Live status for this site: Status Is Down: commonlit.org. This profile covers configuration only.