After the X HTML, the conventions has bebeen changed not its, and now it's a mixture of conventions of XML and HTML, so that is why the second approach is wrong and w3cthe W3C validator accepts the things correct that are according to the standards and conventions .
Active reading. [<http://en.wikipedia.org/wiki/World_Wide_Web_Consortium> <http://english.stackexchange.com/questions/4645/is-it-ever-correct-to-have-a-space-before-a-question-or-exclamation-mark#comment206109_4645> ] - but more could be done.
Peter Mortensen
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