When you insert HTML elements via the HTML menu you will see bullet characters (), called tab marks, being inserted after the element. These tab marks are supposed to be a feature. The way to use them is the following: Suppose you want to insert a header H1. First choose "Header 1" from the menu (and give the attribute a value if you want). In the document will now be inserted
with the insertion point between the H1 tags. Now first type the header text:
When you have done so, hit tab and the insertion point will jump to the tab mark and delete it. You are now ready to continue typing.
If your document has been cluttered with tab marks, which you do not want to use, you can remove them all with cmd-tab. If you do not want to use tab marks at all, you can change Alpha's behavior in the settings dialog, so that the tab marks are not inserted.