Category benchmark · Snapshot 23 October 2026

Uncategorized: website readiness

31 configuration checks across 343 Uncategorized sites from the SID website catalog, with 119 individual profiles for sites in the Chrome UX Report top 50K.

Sites measured: 343
Median readiness index: 62/100
Profiles: 119
Weakest lane: Recover

Readiness by lane

Enable

80/100

All sites 77

Harden

54/100

All sites 56

Accelerate

58/100

All sites 64

Recover

12/100

All sites 10

Biggest gaps for Uncategorized sites

The checks with the most room to improve, weighted by impact.

HSTS kept for at least a year
34% observed · all sites 34%
Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.
Guide: HTTPS and TLS Guide for Website Owners
Modern image formats in use
33% observed · all sites 40%
Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.
Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format
security.txt published
4.5% observed · all sites 7.1%
Publish /.well-known/security.txt with at least Contact and Expires fields, as RFC 9116 requires, and review it before it expires.
Guide: A Practical Website Health Check for Owners
CAA records limit who can issue certificates
8.7% observed · all sites 13%
Publish CAA records naming every CA you actually use, including the CAs your CDN uses for managed certificates. Add an iodef contact if you want reports.
Guide: HTTPS and TLS Guide for Website Owners
DMARC policy enforces quarantine or reject
39% observed · all sites 39%
Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.
Guide: A Practical Website Health Check for Owners
Static files cached for 30 days or more
44% observed · all sites 51%
Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.
Guide: Browser Caching Guide for Website Owners

Where Uncategorized sites lead

robots.txt published88% observedall sites 76%
Meta description written90% observedall sites 84%
Social preview image set62% observedall sites 57%
XML sitemap discoverable75% observedall sites 70%

Stack mix

CDN and edge

Platform or framework

DNS operator

Certificate authority

Readiness leaders

Uncategorized sites in the top 50K with the highest share of observed practices (at least 26 of 31 checks measured). This lists only what we observed on 23 October 2026; owners can request a correction.

All 31 checks for Uncategorized

Check	Lane	Observed	All sites	Measured
HTTP requests move to HTTPS	Harden	88%	91%	321
HSTS kept for at least a year	Harden	34%	34%	339
TLS 1.3 negotiated	Harden	90%	91%	341
Certificate has more than 14 days left	Harden	98%	99%	341
Certificate lifetime of 100 days or less	Harden	67%	67%	341
CAA records limit who can issue certificates	Harden	8.7%	13%	343
DNSSEC signed	Harden	9.3%	8%	343
security.txt published	Harden	4.5%	7.1%	337
DMARC policy enforces quarantine or reject	Harden	39%	39%	342
X-Content-Type-Options: nosniff	Harden	44%	48%	339
Framing restricted	Harden	43%	51%	339
Content Security Policy present	Harden	24%	32%	339
Referrer-Policy set	Harden	23%	24%	339
HTTP/2 negotiated	Accelerate	87%	90%	341
HTTP/3 advertised	Accelerate	33%	37%	339
HTML compressed	Accelerate	92%	93%	337
Static files cached for 30 days or more	Accelerate	44%	51%	298
Modern image formats in use	Accelerate	33%	40%	306
Offscreen images lazy-loaded	Accelerate	52%	62%	285
No render-blocking scripts in <head>	Accelerate	37%	48%	339
robots.txt published	Enable	88%	76%	340
XML sitemap discoverable	Enable	75%	70%	339
Reachable over IPv6	Enable	40%	48%	343
Canonical URL declared	Enable	73%	68%	339
Meta description written	Enable	90%	84%	339
Mobile viewport configured	Enable	97%	94%	339
Structured data present	Enable	50%	51%	339
Social preview image set	Enable	62%	57%	339
Page language declared	Enable	92%	90%	339
At most one redirect to the homepage	Enable	98%	98%	339
Nameservers spread across providers	Recover	12%	10%	343

Uncategorized profiles

Readiness index shown next to each site.

Uncategorized: website readiness

Readiness by lane

Biggest gaps for Uncategorized sites

HSTS kept for at least a year

Modern image formats in use

security.txt published

CAA records limit who can issue certificates

DMARC policy enforces quarantine or reject

Static files cached for 30 days or more