html preview seem to figure out that text from structured editor is the actual document in the editor.

But when you have something like the Visual JSF Page Editor or Mylyn wiki text editor where the html content is actually not in the main document but something generated html preview does not work.

it would be great if html5 preview would have an extension point where one can install a handler for a specific editor what html should be shown in the preview.

end result: when opening mylyn wiki text editor it should show what corresponds to the Preview tab, not the source tab.