title: How to refer in CSS to all elements that have some attribute?
body: <p>I know that <code>[my_attr='my_value']</code> refers to all elements which have attribute <code>my_attr</code> with value <code>my_value</code>. </p>
  
  <p>Is that possible to refer to all elements which have <code>my_attr</code> attribute (no matter what the value is) ?</p>