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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.

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

Cloudflare provides a content delivery network.

Cloudflare provides DNS servers and other web services.

home.pl is a Polish internet services provider owned by United Internet.

Certum (formerly Unizeto) is a Polish SSL certificate authority owned by Asseco.

IdenTrust is a SSL certificate authority.

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.

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

Hotjar is a website analytics and feedback application.

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

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.

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.

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

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

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.

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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