#'no_border: Omits a border around the editor canvas.

#'choice: Gives the editor canvas a popup button that is like an Input with a ~choices list.

#'no_hscroll: Disables horizontal scrolling and hides the horizontal scrollbar.

#'auto_hscroll: Automatically hides the horizontal scrollbar when unneeded (unless #'no_hscroll or #'hide_hscroll is also specified).

#'hide_hscroll: Allows horizontal scrolling, but hides the horizontal scrollbar.

#'no_vscroll: Disables vertical scrolling and hides the vertical scrollbar.

#'auto_vscroll: Automatically hides the vertical scrollbar when unneeded (unless #'no_vscroll or #'hide_vscroll is also specified).

#'hide_vscroll: Allows vertical scrolling, but hides the vertical scrollbar.

#'resize_corner: Leaves room for a resize control at the editor canvas’s bottom right when only one scrollbar is visible.

#'transparent: The editor canvas is “erased” by the windowing system by letting its parent show through.

#'no_focus: Prevents the editor canvas from accepting the keyboard focus when the canvas is clicked or when the WindowChildView.focus method is called.