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tedster - 5:18 am on Apr 30, 2002 (gmt 0)
Newer browser versions are pretty good on this, but Netscape 4, for instance, and some earlier IE5 versions had nasty little display quirks that would crop up around line breaks and spaces.
The main issue is cross-browser display. Even though line breaks and extra spaces in HTML code are "supposed to be" ignored by browsers, in practice that's not the way it always works out.