Registered users can post to QDL, in the public areas as well as in their Sandboxes. The HTML editor used in QDL is TinyMCE, by Moxiecode Systems AB.
Give it a try (don't worry — this instance of the editor doesn't save the changes)...
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TinyMCE is an HTML editor that works inside any web browser. It supports the full complement of HTML features, including:
Essentially, if you can do it in HTML, you can create it, and edit it, using TinyMCE.
QDL has two different implementations of this editor: a stripped-down version that's good for quick edits to small sub-sections of documents, and a full-screen version for doing heavy-duty document authoring. If you're in the small editor, and you want to re-open the post in the large editor, simply click the Edit Full Screen button at the lower left.