Category benchmark · Snapshot 23 October 2026

Cars & Automotive: website readiness

31 configuration checks across 703 Cars & Automotive sites from the SID website catalog, with 362 individual profiles for sites in the Chrome UX Report top 50K.

Sites measured: 703
Median readiness index: 66/100
Profiles: 362
Weakest lane: Recover

Readiness by lane

Enable

84/100

All sites 77

Harden

57/100

All sites 56

Accelerate

65/100

All sites 64

Recover

14/100

All sites 10

Biggest gaps for Cars & Automotive sites

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

HSTS kept for at least a year
41% 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
CAA records limit who can issue certificates
7.8% 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
security.txt published
8.9% 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
DMARC policy enforces quarantine or reject
41% 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
Modern image formats in use
47% 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
HTTP/3 advertised
30% observed · all sites 37%
Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.
Guide: CDN Guide for Website Owners

Where Cars & Automotive sites lead

robots.txt published93% observedall sites 76%
XML sitemap discoverable83% observedall sites 70%
Structured data present63% observedall sites 51%
Canonical URL declared79% observedall sites 68%

Stack mix

CDN and edge

Platform or framework

DNS operator

Certificate authority

Readiness leaders

Cars & Automotive 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 Cars & Automotive

Check	Lane	Observed	All sites	Measured
HTTP requests move to HTTPS	Harden	95%	91%	647
HSTS kept for at least a year	Harden	41%	34%	692
TLS 1.3 negotiated	Harden	91%	91%	700
Certificate has more than 14 days left	Harden	99%	99%	700
Certificate lifetime of 100 days or less	Harden	58%	67%	700
CAA records limit who can issue certificates	Harden	7.8%	13%	703
DNSSEC signed	Harden	8.3%	8%	703
security.txt published	Harden	8.9%	7.1%	685
DMARC policy enforces quarantine or reject	Harden	41%	39%	703
X-Content-Type-Options: nosniff	Harden	52%	48%	692
Framing restricted	Harden	55%	51%	692
Content Security Policy present	Harden	31%	32%	692
Referrer-Policy set	Harden	26%	24%	692
HTTP/2 negotiated	Accelerate	90%	90%	700
HTTP/3 advertised	Accelerate	30%	37%	692
HTML compressed	Accelerate	95%	93%	692
Static files cached for 30 days or more	Accelerate	55%	51%	620
Modern image formats in use	Accelerate	47%	40%	644
Offscreen images lazy-loaded	Accelerate	64%	62%	628
No render-blocking scripts in <head>	Accelerate	45%	48%	692
robots.txt published	Enable	93%	76%	681
XML sitemap discoverable	Enable	83%	70%	686
Reachable over IPv6	Enable	42%	48%	703
Canonical URL declared	Enable	79%	68%	692
Meta description written	Enable	94%	84%	692
Mobile viewport configured	Enable	97%	94%	692
Structured data present	Enable	63%	51%	692
Social preview image set	Enable	62%	57%	692
Page language declared	Enable	94%	90%	692
At most one redirect to the homepage	Enable	98%	98%	694
Nameservers spread across providers	Recover	14%	10%	700

Cars & Automotive profiles

Readiness index shown next to each site.

Cars & Automotive: website readiness

Readiness by lane

Biggest gaps for Cars & Automotive sites

HSTS kept for at least a year

CAA records limit who can issue certificates

security.txt published

DMARC policy enforces quarantine or reject

Modern image formats in use

HTTP/3 advertised