Site Info - Leo-dt.de

IServ is a German platform for schools.

PHP is a scripting language for creating websites.

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

Linux is a Unix-like open source operating system originally developed by Linus Torvalds.

Vodafone is a British multinational telecommunications company also offering web hosting services, including former Cable and Wireless.

Vodafone is a British multinational telecommunications company also offering web hosting services, including former Cable and Wireless.

Hetzner is a German provider of internet services.

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

IdenTrust is a SSL certificate authority.

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

Session cookies are temporary cookies, which are deleted when the user closes the browser.

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.

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 use SSL encryption, e.g. from http://example.com/ to https://example.com/.

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.

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