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Bootstrap (UI frameworks)

Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

cdnjs (CDN)

cdnjs is a free distributed JS library delivery service.

Cloudflare (CDN)

Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.

Cloudflare Browser Insights (Analytics, RUM)

Cloudflare Browser Insights is a tool that measures the performance of websites from the perspective of users.

Google Hosted Libraries (CDN)

Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.

Google Tag Manager (Tag managers)

Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.

HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.

LazySizes unveilhooks plugin (JavaScript libraries, Performance)

LazySizes unveilhooks plugin extends lazySizes to lazyload scripts/widgets, background images, styles and video/audio elements.

PHP (Programming languages)

PHP is a general-purpose scripting language used for web development.

reCAPTCHA (Security)

reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.

Unpkg (CDN)

Unpkg is a content delivery network for everything on npm.

Reveal CSS animation as you scroll down a page.

YouTube (Video players)

YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.