Bug 857 – validator mistakenly reports unmatched surrogate when parsing XHTML file

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Bug 857 - validator mistakenly reports unmatched surrogate when parsing XHTML file


Summary:	validator mistakenly reports unmatched surrogate when parsing XHTML file

Status:	NEW

Product:	Validator.nu
Classification:	Unclassified
Component:	XML parser
Version:	HEAD
Hardware:	All All

Importance:	P2 normal
Assigned To:	Nobody

URL:	http://www.madore.org/~david/.tmp/val...

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2011-09-07 10:27 CEST by David A. Madore
Modified:	2011-09-07 10:27 CEST (History)
CC List:	0 users

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Description David A. Madore 2011-09-07 10:27:10 CEST

The page http://www.madore.org/~david/.tmp/validator-bug.xhtml is, as far as I know, valid XHTML5 (and also polyglot as HTML5), and it is undoubtedly correctly encoded UTF-8 (*not* CESU-8 or anything).  When trying to validate it, Validator.nu mistakenly reports:

Fatal Error: Unmatched low surrogate.
At line 8, column 17

The content of the problematic alt attribute consistes of the two characters: U+1F307 SUNSET OVER BUILDINGS and U+1F365 FISH CAKE WITH SWIRL DESIGN, though the specifics are probably irrelevant beyond the fact that they are not in the BMP (and perhaps, that they were introduced in Unicode 6.0).  Putting two characters is necessary to trigger the bug.