title: detecting flex-box support with CSS3 @supports
body: <p>I am planning on implementing flexbox solutions to my layout if they are supported and I am going to feature-detect if they are supported with CSS3's <code>@support{...}</code> queries.</p>
  
  <p>But what should I test is supported? Since feature <code>@support</code> queries look for support of a given style and then implement styles if supported, of what should I look for support?</p>
  
  <p>In other words, what style do all implementations of flexbox support? </p>
  
  <p>I would think it would be the <code>display:box;</code> for the 2009 flexbox implementation, <code>display:flexbox;</code> for the shortlived 2011 implementation, and <code>display:flex;</code> for the current and final implementation of the spec?</p>