I always have trouble trying to create some nested lists in Wordpress using the default editor in visual mode, since I want to avoid the HTML extra work. Even though I write the HTML myself in the HTML editor mode, the page sometimes will not listen to my HTML and change things as it wants.
For example, I want to create the following structure:
1. 2. a) b) - Paragraph 1 - Paragraph 2
I am using the "type='a'" attribute in the "OL" tag for ordering using letters and when I change back to the visual mode it will display letters, but when I preview the post it will display numbers.
Also sometimes using the visual mode to create lists fast, when creating a nested list it will change an outer list format. The visual editor sometimes changes things as it things it's "better" but a lot of times it changes things the way I don't want to and it's frustrating and a nightmare, and then when you preview or publish a post it does not display the way the ditor did. But I guess that has something to do with the theme's CSS.