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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.

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the visitors browser.

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

The LiteSpeed Web Server is a lightweight web server by LiteSpeed Technologies.

Unix is a range of operating systems originally developed at Bell Labs. This includes Unix and Unix-like systems, such as Linux.

Microsoft is a multinational technology company headquartered in USA.

Cyber_Folks is a Polish web hosting provider. This includes its brands BiznesHost, SuperHost, Hekko, NetDC, Ogicom, Active 24, Domeny and Kei.pl.

Microsoft is a multinational technology company headquartered in USA.

Cyber_Folks is a Polish web hosting provider. This includes its brands BiznesHost, SuperHost, Hekko, NetDC, Ogicom, Active 24, Domeny and Kei.pl.

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

Microsoft is a multinational technology company headquartered in USA, also offering email services.

Cyber_Folks is a Polish provider of internet services. This includes its brands BiznesHost, SuperHost, Hekko, NetDC, Ogicom, Active 24, Domeny and Kei.pl.

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

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

Meta Pixel (formerly Facebook Pixel) is an analytics tool to track actions on websites.

Gemius offers website traffic and audience measurement services.

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

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

Tradedoubler is an affiliate and advertising network.

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.

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.

The frameset element is an HTML tag which specifies the layout of a web page in terms of rectangular subspaces.

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.

Persistent cookies with an expiration time of more than 10 years.

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

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

Gzip (GNU zip) is a file compression algorithm.

Brotli is a lossless compression algorithm developed by Google.

A strong ETag is an HTTP header field for validation of cached web pages, that indicates a byte-for-byte identical page in the cache.

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.

QUIC (Quick UDP Internet Connections) is an experimental network protocol, originally designed by Google and submitted to IETF standardization.

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.

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.

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

HTML5 is the fifth revision of the HTML standard.

HTML - Hypertext Mark-up Language - is a language to define web pages.

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.

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