Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
Many times, people add unnecessary whitespaces inside some attributes. For example class=" col-md-2" and sometimes double space between values in the class attribute class="col-md-2 col-offset-2
Would be nice to give a warning in such cases

Describe the solution you'd like
Would be good to have a rule for "No leading/training spaces in attribute" and maybe another one specifically for class attribute to handle that all values should be separated by a single space

Describe alternatives you've considered
NA