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HTML

Differences between HTML 4.01 and XHTML

HTML 4.01    
 Allows upper / lowercase tags 
 Non-close tags, others (sloppy) 
 doesn’t require a Doctype 
XHTML    
 More strict, therefore easier to verify  
 Based on XML  
 Requires a doctype  
 In theory you can extend it to add your own tags
 Even empty tags must be closed
 Attributes must be ” ” tized