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

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.

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

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.

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

Transitional version of XHTML.

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.

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

JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.

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