Can a tag have two or more classes?

Question

I was wondering if I could add two or more classes to a tag, as in:

<p class="underscore" class="bluebg">

Answer 1

Tags can have as many classes as you want, but you need to use an unique 'class' attribute:

<p class="underscore bluebg validclassname separatedbyspaces">

Answer 2

Thank you!