breaking spaces ("nbsp")?
Is it possible to insert a tab character in HTML instead of having to type
four times?
It's much cleaner to use CSS. Try padding-left:5em
or margin-left:5em
as appropriate instead.
It depends on which character set you want to use.
There's no tab entity defined in ISO-8859-1 HTML - but there are a couple of whitespace characters other than
such as  
,  
,and  
.
In ASCII, 	
is a tab.
Here is a complete listing of HTML entities and a useful discussion of whitespace on Wikipedia.
No, tab is just whitespace as far as HTML is concerned. I'd recommend an em-space instead which is this big (-> <-) and is input as  
. You might even be able to get away with using the unicode character for it if you're lucky.
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