Many chapters of HTML version of JLS3 (http://java.sun.com/docs/books/jls/third_edition/download/langspec-3.0.zip) are HTML invalid.
For example, there are double closing tags, invalid closing, etc.
E.g. binaryComp.html with double closing </i> - line 145:
<li>If the expression is of the form <code>new</code> <i>D</i>(..){...} or <i>X</i>.<code>new</code> <i>D</i></i>

E.g. grammars.html with invalid closing - line 65:
break <i>Identifier_opt</i> ;

Almost all chapters have such errors.