title: ImportantForAccessibility=false vs. ContentDescription=null
body: <p>There is an element I want TalkBack to skip when reading out lout the screen.</p>
  
  <p>I can set it's <code>contentDescription</code> to <code>null</code>.</p>
  
  <p>I also read about <code>ImportantForAccessibility:</code> indicates whether an element is visible or not to the Accessibility API.</p>
  
  <p>Which other APIs are there?</p>
  
  <p>Is it cleaner to use <code>ImportantForAccessibility=false</code> over <code>contentDescription=null</code>?</p>