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

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

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

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

Play is a Polish telecommunications and internet services provider owned by Iliad. This includes the former 3S brand.

Play is a Polish telecommunications and internet services provider owned by Iliad. This includes the former 3S brand.

Play is a Polish telecommunications and internet services provider owned by Iliad. This includes the former 3S brand.

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

jsDelivr is a service for hosting JavaScript files.

External Cascading Style Sheets define style rules in a separate CSS file.

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 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.

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.

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