Monaco Editor
Rich IntelliSense, Validation TypeScript, JavaScript, CSS, LESS, SCSS, JSON, HTML Basic Syntax Colorization XML, PHP, C#, C++, Razor, Markdown, Diff, Java, VB, CoffeeScript, Handlebars, Batch, Pug, F#, Lua, Powershell, Python, Ruby, SASS, R, Objective-C Colorizers are implemented using Monarch.
https://microsoft.github.io/monaco-editor/
