These don't cause paragraph breaks. Text level elements that define character styles can generally be nested. They can contain other text level elements but not block level elements.
These all require start and end tags, e.g.
This has some <B>bold text</B>.
These all require start and end tags, e.g.
This has some <EM>emphasized text</EM>.
The quick red fox jumped over the lazy brown dog.
INPUT, SELECT and TEXTAREA