title: Storyboard Auto Layout: "trailing space to container" vs "bottom space to bottom layout"
body: <p>Could someone help me understand the difference between "trailing space to container" and "bottom space to bottom layout" in interface builder auto layout? </p>
  
  <p><img src="https://i.stack.imgur.com/FSdHN.png" alt="Interface Builder Auto Layout Constraints"></p>
  
  <p>I'd like to put a layout constraint in place that ties the bottom of a view to the bottom of it's superview. Both of the above sound like they should accomplish this. </p>
  
  <p>Any clarification would be greatly appreciated. </p>