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PHP is a scripting language for creating websites.

JavaScript is a lightweight, object-oriented, cross-platform scripting language. This includes TypeScript.

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.

Socket.IO enables bidirectional communication between the browser and the server based on WebSocket.

Bootstrap is an open source HTML, CSS, and JavaScript framework.

Bootstrap is an open source HTML, CSS, and JavaScript framework.

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

Node.js is a server-side JavaScript environment for writing network programs such as web servers, originally developed by Ryan Dahl.

The Apache HTTP Server is an open source web server by the Apache Software Foundation.

Oracle provides a large range of IT products and services.

Oracle provides a large range of IT products and services.

Cloudflare provides DNS servers and other web services.

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

The SSL certificate is invalid because it is not issued for the domain where it is used.

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.

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.

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

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

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.

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

Persistent cookies with an expiration time between 1 month and 1 year.

Persistent cookies with an expiration time between 1 and 10 years.

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.

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/.

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

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.

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.

WebP is an image format that provides lossless and lossy compression, developed by Google.

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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