The submission form is a bit tricky. If you select WYSIWYG for format, you can still switch to 'source code' in the editor that appears, and edit the HTML. But if you ever would switch that editor out of source mode (and I think later edits would start it that way) you will lose all the HTML except for a very smal subset of tags that are known to the editor. (E.g. script elements, the id and class properties of all elements would all disappear.)
So always make sure the Format pull-down is set to HTML first time you submit the comment if you want to include an Interactive Diagram.
The submission form is a bit tricky. If you select WYSIWYG for format, you can still switch to 'source code' in the editor that appears, and edit the HTML. But if you ever would switch that editor out of source mode (and I think later edits would start it that way) you will lose all the HTML except for a very smal subset of tags that are known to the editor. (E.g. script elements, the id and class properties of all elements would all disappear.)
So always make sure the Format pull-down is set to HTML first time you submit the comment if you want to include an Interactive Diagram.