This demo use CKEditor to create a Mallard Syntax document. CKEditor requires JavaScript to run. In a browser with no JavaScript support, like yours, you should still see the contents (HTML data) and you should be able to edit it normally, without a rich editor interface.
Insert title:
Insert type of page: Guide Topic
Insert ID of page:
Insert link type 01: Guide Topic
Insert xref 01:
Insert link type 02: Guide Topic
Insert text: