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WordPress is an open source blog publishing and content management system, based on PHP and MySQL.

Docutils is a Python-based open-source text processing system for generating documentation in HTML and other formats.

Sphinx is a Python-based tool for creating project documentation, based on Docutils.

PHP is a scripting language for creating websites.

Static websites don't use any server-side programming language for generating web pages, but deliver fixed content which is created manually or with an offline tool.

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

jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig.

Underscore is a JavaScript library that provides functional programming support.

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

Cloudflare Server is a web server developed by Cloudflare.

LeaseWeb is a web hosting provider with data centers in Europe, USA and Asia, headquartered in the Netherlands. This includes the former iWeb brand.

Automattic is hosting WordPress-based websites. This includes it Pressable and Newspack brand.

Read the Docs provides a platform for creating and hosting technical documentation.

Amazon is a US-based e-commerce and cloud computing provider.

LeaseWeb is a web hosting provider with data centers in Europe, USA and Asia, headquartered in the Netherlands. This includes the former iWeb brand.

Automattic is hosting WordPress-based websites. This includes it Pressable and Newspack brand.

Amazon is a US-based e-commerce and cloud computing provider.

Cloudflare provides a content delivery network.

Akamai is a content delivery network. This includes the former brands Instart Logic and StackPath.

Amazon is a US-based e-commerce and cloud computing provider.

Cloudflare provides DNS servers and other web services.

DNS Made Easy is a DNS service provider owned by DigiCert.

Gmail is the email service provided by Google.

Fastmail is a provider of email services.

Let’s Encrypt is a free, automated, and open certificate authority provided by the Internet Security Research Group.

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

The validity of the SSL certificate has expired.

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.

CrazyEgg is a website visitor and click tracking service.

WordPress Jetpack Stats is a visitor tracking plugin for the WordPress publishing platform.

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

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

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.

Session cookies are temporary cookies, which are deleted when the user closes the browser.

Persistent cookies with an expiration time of up to 1 day.

HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security.

Non-HttpOnly cookies are used in the HTTP protocol and also in client side scripts, which may be a security threat.

Secure cookies are used only via an encrypted connections, which may increase security.

Non-secure cookies may be used via an unencrypted connections, which may be a security threat.

Gzip (GNU zip) is a file compression algorithm.

Brotli is a lossless compression algorithm developed by Google.

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/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 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.

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.

Transitional version of XHTML.

Strict version of XHTML.

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

ISO-8859-1 (informally also called Latin-1) is an 8-bit character set for Western European languages.

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.

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

ICO is an image file format for computer icons, originally used in Microsoft Windows, on the Web often used for favicons.

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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