title: Is there a way to install/emulate an older version of Safari ? (i.e 8)
body: <p>On OSX:
  After an update to El Capitan, I found that Safari 9 was installed by default.
  For software testing purposes, I need to test a web app through Safari 8 (which is still the latest version in Yosemite).
  I searched but there is no way (expect for browserstack) to install or emulate an older version of Safari.</p>
  
  <p>Other than downgrading to Yosemite, is there a way to do it?</p>