Louis<THREE-PER-EM SPACE>XVI may have lost his head, but we don't want his number also to fall off on to the next line, or even to become too far separated from his name. We need to know what kind of space to use to resist the guillotine!
NBSP
You should not rely on fixed-width spaces to approximate regular spaces. A simple switch from Arial Narrow to Verdana will demonstrate why: the widths of normal spaces and non-breaking spaces are related to the width of the fonts' glyphs, whereas the width of a fixed-width space is related to the /height/ of the glyphs.
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