HTML5 and Unicode Normalization Form C

Validating
 http://www.user.uni-hannover.de/nhtcapri/temp/yerushalayim.html
results in error
 Text run is not in Unicode Normalization Form C.

Is Unicode Normalization Form C actually required by HTML5
or is this a validator bug?

Received on Thursday, 26 May 2011 15:42:12 UTC