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Drupal is an open source content management system written in PHP, originally developed by Dries Buytaert.

PHP is a scripting language for creating websites.

JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages.

Nginx (pronounced as "engine X") is a lightweight open source web server developed by Igor Sysoev.

Linux is a Unix-like open source operating system originally developed by Linus Torvalds.

Pantheon provides CMS hosting.

Fastly is a content delivery network.

MarkMonitor provides domain management services, owned by Newfold Digital.

Starfield Technologies is an SSL certificate authority owned by Go Daddy.

unpkg is a JavaScript content delivery network for libraries that use the npm package manager.

Google Analytics is a free service to get detailed statistics about the visitors of a website, provided by Google. This includes the Ads conversion tracking and the Floodlight services.

Yandex.Metrica is a free web analytics system combining customizable reporting tools with behavioral analytics.

Microsoft UET (Universal Event Tracking) records what visitors do on a website after they click on an ad.

Full Circle Studies collects information about general website visitation patterns as part of the ComScore market research.

Quantcast provides visitor statistics of web sites.

Siteimprove is a web governance software, that includes a web analytics module.

Oracle Data Management Platform (formerly BlueKai) collects website visitor data and provides it to advertisers.

The Google Advertising network consists of AdSense, DoubleClick and other services.

Amazon Associates is the affiliate program of Amazon.

Microsoft Advertising is an advertising platform by Microsoft. This includes the former brands Xandr, AppNexus, Aquantive and others.

Amobee is an advertising and marketing platform. This includes the former brands Turn and Adconion.

The Google Tag Manager is a Google service to support webmasters to manage tags on their websites.

AddToAny is a social bookmarking and sharing service.

Facebook Social Plugins provide a way for Facebook users to share web pages with their friends.

The WhatsApp share button allows users to share content with their WhatsApp contacts.

External Cascading Style Sheets define style rules in a separate CSS file.

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

Gzip (GNU zip) is a file compression algorithm.

A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache.

The Internet Protocol version 6 (IPv6) provides amongst others a vastly larger address space than the preceding version 4. We consider a website to support IPv6 if a 128-bit address is assigned to it, regardless of the content delivered at that address.

HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.

The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com.

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph.

Twitter/X Cards enable automatic attachment of photos, videos and media elements to tweets.

Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.

HTML5 is the fifth revision of the HTML standard.

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

PNG (Portable Network Graphics) is a lossless compression image format, suitable to store graphics with uniformly colored areas, and originally introduced as a free, open-source successor of GIF.

JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.

Scalable Vector Graphics (SVG) is an XML-based vector image format.

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