title: background image not showing in Microsoft Edge
body: <p>I've a problem with a background image used within a div in reveal.js when shown from within Microsoft Edge</p>
  
  <p>this page has the minimum set to show the problem:</p>
  
  <p><a href="https://beta.lookcastapp.com/views/dispatch/campaign/asd908/EnterTitleHere/1" rel="nofollow noreferrer">https://beta.lookcastapp.com/views/dispatch/campaign/asd908/EnterTitleHere/1</a></p>
  
  <p>it works as intended on Explorer 11, Chrome, et al.</p>
  
  <p>I checked all the bounding boxes and the div is there as expected and it is not occluded by any other div background</p>
  
  <p><a href="https://i.stack.imgur.com/JExIL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JExIL.png" alt="bounding box"></a></p>
  
  <p>I also tried messing with the url() syntax, adding spaces and quotes and things to no avail</p>
  
  <p>here's a comparative picture from chrome:</p>
  
  <p><a href="https://i.stack.imgur.com/icazU.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/icazU.jpg" alt="enter image description here"></a></p>
  
  <p>images courtesy of <a href="http://lorempixel.com/" rel="nofollow noreferrer">http://lorempixel.com/</a></p>