Dear you guys,
I found in some epub reader (FB reader, etc.) there is a setting for styles in case the provided css is chosen to be ignored. I understand some only.
1) Regular Paragraph
2) Epub paragraph (xhmtl tag content)
3) Title
4) Section Title
5) Subtitle
6) Heading 1 to 6 (I know this means <h1> to <h6>
7) Annotation
8) Epigraph
9) Author
10) Poem Title
11) Stanza
12) Verse
13) Cite (probably this means <cite>)
14) Internal Hyperlink
15) External Hyperlink
16) Footnote
17) Italic, Emphasis, Bold, Strong (I know these mean <i>, <em>, <b>, <strong>)
18) Definition
19) Definition Description
20) Preformatted Text
21) Code (problably this means <code>)
22) Striketrhough (<s>)
23) superscript, subscript (<sup>, <sub>)
24) Image (<img>)
25) Date
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The reader provides setting to format these things, but if I just set <p class="title"> it is only seen as a paragraph rather than "Title".