CSS:white-space

[edit] Summary

The white-space CSS property is used to to describe how whitespace inside the element is handled.

white-space: normal | pre | nowrap | pre-wrap | -moz-pre-wrap | pre-line | inherit ;

normal: all sequences of whitespace and line breaks will be collapsed. Line breaks are add to wrap the content.
pre: all white spaces in the source will be preserved, lines are only broken at newline characters in the source.
nowrap: all sequences of whitespace and line breaks will be collapsed, also line breaks (text wrapping) are suppressed within content.
pre-wrap New in Firefox 3: all white spaces in the source will be preserved, lines are broken at newline characters and as needed to wrap the content.
-moz-pre-wrap Deprecated: Same as pre-wrap, this is the Mozilla extension which became the CSS 2.1 pre-wrap, which should be used instead.
pre-line: all sequences of whitespace will be collapsed, lines are broken at newline characters and also as needed to wrap the content.
inherit: inherits from parent.

code {
  white-space: pre;
}

Values pre-wrap and pre-line are not yet implemented in Mozilla. Currently you can use -moz-pre-wrap instead of pre-wrap.

(Sample Compatibility Chart)