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Site Info - System21.tv

Overview of web technologies used by System21.tv.

Website Background

System 21 — Обучающая платформа Системы21
automatic translation provided by Microsoft
System 21-learning platform Sistemy21

Description on Homepage

Number 1,615,775 of all websites according to Alexa

Popularity rank

WordPress is an open source blog publishing and content management system, based on PHP and MySQL.

WordPress 4.9.8
(version 4.9.4 used until recently)
(0% of sites use a newer version)

PHP is a popular scripting language for creating web pages.

PHP

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

JavaScript

jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig.

jQuery 1.12.4
(version 1.8.3 used until recently)
(14% of sites use a newer version)

GSAP is a JavaScript library for HTML5 animations.

GSAP 1.20.4
(version 1.18.2 used until recently)
(3% of sites use a newer version)

HTML5 is the fifth revision of the HTML standard.

HTML5

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

UTF-8

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.

PNG

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

JPEG

Scalable Vector Graphics (SVG) is an XML-based vector image format.

SVG

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

GIF
(used until recently)

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

External CSS

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Embedded CSS

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

Inline CSS

Gzip (GNU zip) is a file compression algorithm.

Gzip Compression

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

HTTP/2

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

Session Cookies
(used until recently)

Persistent cookies with an expiration time between 1 day and 1 month.

Cookies expiring in days
(used until recently)

Non-HttpOnly cookies are used in the HTTP protocol and also in client side scripts, which may be a security threat.

Non-HttpOnly Cookies
(used until recently)

Non-secure cookies may be used via an unencrypted connections, which may be a security threat.

Non-Secure Cookies
(used until recently)

A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache.

Weak ETag
(used until recently)

The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com.

Default subdomain www
(used until recently)

Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.

Generic RDFa

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.

Open Graph
(used until recently)

IdenTrust is a SSL certificate authority.

IdenTrust

The SSL certificate is invalid because it is not issued for the domain where it is used.

Invalid Domain
(used until recently)

The CDNJS is a content distribution network, hosting a large number of JavaScript libraries, provided by CloudFlare.

CDNJS

Google Hosted Libraries (formerly called Google Libraries API) is a content distribution network for the most popular, open-source JavaScript libraries, provided by Google.

Google Hosted Libraries
(used until recently)

Google Analytics is a free service to get detailed statistics about the visitors of a website, provided by Google.

Google Analytics
(used until recently)

Quantcast provides visitor statistics of web sites.

Quantcast
(used until recently)

Nginx (pronounced as "engine X") is a lightweight open source web server developed by Igor Sysoev.

Nginx 1.14.0
(4% of sites use a newer version)

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

Apache
(used until recently)

HostGator is a web hosting provider owned by Endurance.

HostGator

Weebly is a hosted website building service.

Weebly
(used until recently)
hosting info based on data from ipinfo.io, see details

Tuvalu, also used for television related sites

.tv

United States

Russian

 

 

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