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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.

Debian is a Linux distribution.

Strato is a European web hosting provider headquartered in Berlin and owned by United Internet.

Strato is a European web hosting provider headquartered in Berlin and owned by United Internet.

Strato is a European internet services provider headquartered in Germany and owned by United Internet.

Strato is a European internet services provider headquartered in Germany and owned by United Internet.

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

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

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

Gzip (GNU zip) is a file compression algorithm.

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/.

JSON-LD (JavaScript Object Notation for Linked Data) is a method of encoding Linked Data using JSON.

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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