[whatwg] Surrogate pairs and character references

Øistein E. Andersen liszt at coq.no
Tue Sep 8 15:39:03 PDT 2009

According to the spec, character references may cause surrogate  
characters (0xD800 to 0xDFFF) to be inserted into the DOM.  Assuming  
that the DOM is an UTF-16BE environment, �� and  
𐀀 will both result in \xD800\xDC00 or U+1,0000.  This should  
probably be pointed out explicitly since extra processing has to be  
done to achieve the same result in a parser that is not built atop  

Furthermore, it is not entirely clear whether a mixed form like  
\xD800� encoded in UTF-16BE should give \xD800\xDC00 or \xFFFD 
\xDC00.  Not all browsers convert unpaired surrogates in UTF-16 to U 
+FFFD, so the mixed form may be interpreted as U+1,0000.

Øistein E. Andersen

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