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On the Web, the JavaScript document.execCommand method is used with contentEditable to implement interactive editors. It can be used to apply formatting to selected text and to insert content.

Also earlier this year, open source code repository software startup GitLab introduced an integration of the Koding web-based IDE. To try the text editor, open up the Google cloud console.

Adobe has released version 1.0 of Brackets, its free open-source text editor that's built in HTML, CSS and JavaScript, for coding HTML, CSS and JavaScript.