CSS3 (~2009-2012):

Level 3 CSS specs as defined by the CSSWG. (immutable)

CSS4 (~2013-2018):

Essential features that were not part of CSS3 but are already a fundamental part of CSS.

CSS5 (~2019-2024):

Newer features whose adoption is steadily growing.

CSS6 (~2025+):

Early-stage features that are planned for future CSS.

What Is ReactJS?

React (a.k.a. ReactJS or React.js) is a JavaScript library for creating user interfaces, open sourced to the world by Facebook and Instagram team in 2013. One might think of it as the “View” in the “Model-View-Controller” pattern 

Node.js Tools 1.0 for Visual Studio (NTVS) is now available for download! NTVS is a free, open source extension for Visual Studio 2012 and Visual Studio 2013 that turns Visual Studio into a Node.js IDE. NTVS 1.0 supports the free Visual Studio Community and Visual Studio Express for Web editions, as well as Visual Studio Professional and higher

const string dateTime = "Wed, 17 Apr 2013 12:10:18 GMT";
Console.WriteLine(DateTime.Parse(dateTime));

 String was not recognized as a valid DateTime because the day of week was incorrect.

 Console.WriteLine(DateTime.Parse(dateTime, CultureInfo.InvariantCulture));