some tips, questions about there reliability

[Ninjakreborn]

I saw these in a tutorial, are all of these true, based on your personal experiences.

[quote]A float must be given a width
A float must be given a directional value of left or right (there is no top or bottom)
If you want a float to appear alongside another element, it must precede that element in the source order of the document
A float never covers text or inline images
Avoid using a width on a block element following a float; use a margin on the same side of the float instead
Since a float is taken "out of the flow" of the document, a float inside another container must be cleared in order for the parent container to enclose it properly [/quote]