Is there an HTML editor for appinventor?

When I use an HTML editor to format the text that I want to include in the Label, this text do not appear in the same image that I formatted them with.
E.g. font size is not shown as set, line alignment, etc.
Is there a special editor or a way to fix this?

There are only very limited formatting tags available with the label
see also for notifier - the same applies

You might want to consider using a webviewer to display your text....