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Technically, HTML treats all whitespace (space, tab, newline, 
carriage return, etc) as interchangable with a single space, 
except sometimes when you are in a <pre> block.

In practice, user agents often honor it anyhow.  If tab isn't 
working, you might have better luck replacing it with a series 
of 8  , ((ampersand, then "nbsp", then semicolon)*8) but 
I'm not sure the ugliness is worth it.