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Category benchmark · Snapshot 23 October 2026

Programming & Software: website readiness

31 configuration checks across 231 Programming & Software sites from the SID website catalog, with 111 individual profiles for sites in the Chrome UX Report top 50K.

Sites measured
231

all popularity bands

Median readiness index
68/100

all sites: 64

Profiles
111

top-50K sites

Weakest lane
Recover

lowest weighted score

Readiness by lane

Enable

81/100

All sites 77

Harden

59/100

All sites 56

Accelerate

65/100

All sites 64

Recover

7/100

All sites 10

Biggest gaps for Programming & Software sites

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

  1. HSTS kept for at least a year

    40% 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

  2. Modern image formats in use

    42% 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

  3. security.txt published

    15% 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

  4. DMARC policy enforces quarantine or reject

    45% 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

  5. CAA records limit who can issue certificates

    23% 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

  6. Static files cached for 30 days or more

    50% 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 Programming & Software sites lead

  • robots.txt published91% observedall sites 76%
  • Reachable over IPv662% observedall sites 48%
  • CAA records limit who can issue certificates23% observedall sites 13%
  • Meta description written92% observedall sites 84%

Stack mix

CDN and edge

Platform or framework

DNS operator

Certificate authority

Readiness leaders

Programming & Software 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.

  1. expo.dev94/100
  2. replit.com90/100
  3. github.com86/100
  4. jetbrains.com86/100
  5. opera.com86/100
  6. buildkite.com84/100
  7. bitbucket.org83/100
  8. image-line.com83/100
  9. pypi.org83/100
  10. ti.com83/100

All 31 checks for Programming & Software

CheckLaneObservedAll sitesMeasured
HTTP requests move to HTTPSHarden92%91%223
HSTS kept for at least a yearHarden40%34%231
TLS 1.3 negotiatedHarden93%91%230
Certificate has more than 14 days leftHarden>99%99%230
Certificate lifetime of 100 days or lessHarden73%67%230
CAA records limit who can issue certificatesHarden23%13%230
DNSSEC signedHarden12%8%231
security.txt publishedHarden15%7.1%230
DMARC policy enforces quarantine or rejectHarden45%39%231
X-Content-Type-Options: nosniffHarden44%48%231
Framing restrictedHarden47%51%231
Content Security Policy presentHarden32%32%231
Referrer-Policy setHarden24%24%231
HTTP/2 negotiatedAccelerate92%90%230
HTTP/3 advertisedAccelerate40%37%231
HTML compressedAccelerate94%93%230
Static files cached for 30 days or moreAccelerate50%51%206
Modern image formats in useAccelerate42%40%199
Offscreen images lazy-loadedAccelerate56%62%184
No render-blocking scripts in <head>Accelerate51%48%231
robots.txt publishedEnable91%76%223
XML sitemap discoverableEnable69%70%229
Reachable over IPv6Enable62%48%231
Canonical URL declaredEnable74%68%231
Meta description writtenEnable92%84%231
Mobile viewport configuredEnable97%94%231
Structured data presentEnable52%51%231
Social preview image setEnable60%57%231
Page language declaredEnable90%90%231
At most one redirect to the homepageEnable99%98%231
Nameservers spread across providersRecover7%10%230

Programming & Software profiles

Readiness index shown next to each site.