This is an embeddable code editor written in JavaScript with many features:

  • Syntax highlighting for over 110 languages (TextMate/Sublime Text.tmlanguage files can be imported)
  • Over 20 themes (TextMate/Sublime Text .tmtheme files can be imported)
  • Automatic indent and outdent
  • An optional command line
  • Handles huge documents (four million lines seems to be the limit!)
  • Fully customizable key bindings including vim and Emacs modes
  • Search and replace with regular expressions
  • Highlight matching parentheses
  • Toggle between soft tabs and real tabs
  • Displays hidden characters
  • Drag and drop text using the mouse
  • Line wrapping
  • Code folding
  • Multiple cursors and selections
  • Live syntax checker (currently JavaScript/CoffeeScript/CSS/XQuery)
  • Cut, copy, and paste functionality

You can read more at the official website.
You can custom this with new settings like: remove vertical line from editor or change the size of the font.

See the Pen
ace_editor_001
by Cătălin George Feștilă (@catafest)
on CodePen.

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