Require an Editor method to provide the cursor position as an integer representing the offset of the current cursor position from the start of the document with respect to the text displayed in the editor.

For example consider an editor displaying 'This is text content'. The underlying html will be <p><span>This is text content</span></p>. When cursor is placed after 'text', I would like to obtain the cursor position as 12 i.e. the offset based on the text displayed irrespective of the underlying html.