Lightweight
You can start with the default small package that is about 70Kb (24Kb gzipped), including Indentation, History (Undo/Redo), and Shortcuts extensions.
Accessibility Friendly
By using a "contenteditable" element, screen readers are able to read the current and selected code for visually impaired users, which promises your site accessibility.
Modular and Extensible
The editor functionality can be extended by adding modular extensions. You can build your custom editor by picking them out or creating your own extensions.
Mobiles and IE
The UX is not perfect, but the editor works on mobile devices thanks to the "contenteditable". It also works on the IE11 with some limitations.
- Highlighting the current line
- Line numbers
- Auto closing paired characters
- Undoing and redoing code changes
- Increasing and decreasing the indent level of selected lines
- Commenting out selected lines with line or block comments by shortcuts
- Highlighting matched brackets
- Search and replace toolbar
- Finding words in match case, whole word and regexp modes
- Jump toolbar to go to the specific line
- Resizing the editor size by drag
- Custom dialog
- Custom context menus
- Text wrapping
- Code hint
- Huge code over 20,000 lines