HTML5 Compliant - Trailing Space in Class Attribute

Question

I know that technically HTML5 is a \'living spec\' but I\'m wondering if it\'s compliant to have trailing spaces inside of a class name. I didn\'t see any reference to this

Answer 1

According to http://validator.w3.org/ under a the following validates successfully.

Leaving a trailing and leading space may be acceptable, but it's not pretty and some people do not consider it to be best a practice.