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

Cloudflare Server is a web server developed by Cloudflare.

Cloudflare provides a content delivery network.

Akamai is a content delivery network. This includes the former brand Instart Logic.

Cloudflare provides DNS servers and other web services.

Gmail is the email service provided by Google.

GlobalSign is an IT security service provider, also operating as SSL certificate authority.

Sectigo (formerly Comodo CA) is a US-based SSL certificate authority.

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

The CDNJS is a content distribution network, hosting a large number of JavaScript libraries, provided by CloudFlare.

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.

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

Lotame Crowd Control is an analytics package to measure social media behavior for publishers and advertisers.

Chartbeat is a real-time web analytics tool by Betaworks.

CrazyEgg is a website visitor and click tracking service.

Facebook Pixel is an analytics tool to track actions on websites.

Quantcast provides visitor statistics of web sites.

Nielsen provides web site visitor tracking services. This includes the former brand NetRatings.

Facebook Pixel is an analytics tool to track actions on websites.

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.

Epsilon (formerly Conversant and ValueClick) provides an advertising network.

Xandr is an advertising network owned by Microsoft, formerly by AT&T. This includes the former AppNexus brand.

OpenX (previously called phpAds, phpAdsNew, MaxMediaManager and Openads) is an open source ad management system and ad marketplace.

PubMatic is a marketing automation software provider.

CJ Affiliate (formerly Commission Junction) is an online advertising and affiliate marketing service by Conversant.

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

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

A Twitter Button allows a Twitter user to post a tweet from the visited site.

The Pinterest Pin-It button allows website visitors to pin images onto Pinterest.

LinkedIn Share Buttons enable visitors to to share website content with their LinkedIn network.

Reddit Buttons allow web pages to be submitted to and discussed on Reddit.

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.

Brotli is a lossless compression algorithm developed by Google.

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/2 is the second major version of the HTTP network protocol.

HTTP/3 is the third major version of the HTTP network protocol, derived from the QUIC protocol.

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 Cards enable automatic attachment of photos, videos and media elements to Tweets.

JSON-LD (JavaScript Object Notation for Linked Data) is a method of encoding Linked Data using JSON.

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

Microdata is a specification to integrate metadata within existing content on web pages.

HTML5 is the fifth revision of the HTML standard.

Transitional version of HTML.

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.

GIF (Graphics Interchange Format) is a lossless compression image format, originally introduced by CompuServe and suitable to store graphics, logos and simple animations.

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