Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
Google Analytics is a free web analytics service that tracks and reports website traffic.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
Segment Consent Manager is a tool that automates the process of requesting consent for data usage, stores data on user privacy preferences, and updates these preferences when users request changes.
A modest JavaScript framework for the HTML you already have.
Typekit is an online service which offers a subscription library of fonts.
Unpkg is a content delivery network for everything on npm.