A JavaScript Library For In-Browser Code Editing: CodeMirror

CodeMirror is a JavaScript library that can convert any element on a web page into an interface for editing code.

It supports most of the popular languages (HTML, CSS, PHP, Python, Ruby, Java, C#, SQL, XML, etc.) and works cross-browser.

There are many options offered like enabling undo, line numbers, the behaviour of "tab" and "enter" commands.

Also, with the help of its API, the editor can be totally manipulated.

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