costco.com

Conformance report

Tracked site: https://costco.com/. Checked against the Web 1.0 Specification (2026 Edition), front page only, roughly every two weeks.

F

Fails on multiple major faults. Latest check: 2026-09-30. 4 major, 3 minor; 7.0 MB first-party transfer, 160 requests.

Rule by rule

RuleFaultResult
JS-01JavaScript MAJOR
  • <script src="/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/4bd1b696-04d4e6726f46d1d5.js">
  • <script src="/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/3794-807264abe3a3ca4f.js">
  • <script src="/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/main-app-b8d08bae6a05c6f8.js">
  • <script src="/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/8805-0c13b296407dd623.js">
  • <script src="/consumer-web/browse/prd/homepage-usbc/_next/static/chunks/1204-fe83a65ddafa024e.js">
  • and 172 more
TP-01Third-party requests MAJOR
  • https://bfasset.costco-static.com/fonts/CostcoSans-Upright.woff2 (via url() in https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/css/6e5a439050deb77c.css)
  • https://bfasset.costco-static.com/fonts/CostcoSans-Italic.woff2 (via url() in https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/css/6e5a439050deb77c.css)
CK-01Cookies MAJOR
  • Set-Cookie on https://costco.com/
WT-01Excessive transfer MAJOR
  • total first-party transfer 7.00 MB (over 2 MB)
AV-01Autoplaying media pass
HY-01Missing doctype pass
HY-02Missing title pass
HY-03Missing language pass
HY-04Missing charset pass
HY-05Missing alt text pass
FT-01Web fonts 2 minor
  • @font-face in https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/css/6e5a439050deb77c.css
  • @font-face in https://www.costco.com/consumer-web/browse/prd/homepage-usbc/_next/static/css/6e5a439050deb77c.css
RQ-01Excessive requests 1 minor
  • 160 resource requests
FR-01First-party frame pass

History

DateGradeMajorsMinors WeightRequests
2026-09-30 F 4 3 7.0 MB 160
2026-09-16 F 4 3 9.0 MB 155
2026-09-02 F 4 3 9.1 MB 156
2026-08-17 F 4 3 9.1 MB 165