Detect Optimizely

detect-optimizely.user.js

var styles = 
  { padding:     '4px'
  , width:       '100%'
  , textAlign:   'center'
  , position:    'absolute'
  , background:  '#BADA55'
  , borderBottom:'solid 1px #666'
  , opacity:     '0.5'
  };

// get a reference to the actual window
var w = window.unsafeWindow || (
  unsafeWindow = (function() {
    var el = document.createElement('p');
    el.setAttribute('onclick', 'return window;');
    return el.onclick();
  }())
);

function detectOptimizely() {
  var experiments = ((w.optimizely || {}).activeExperiments || []), bod, el;
  if(experiments.length === 0) return;
  bod = w.document.body
  el = w.document.createElement('p');
  console.log('Optimizely is running experiments: ', experiments);
  for(prop in styles)
    styles.hasOwnProperty(prop) && (el.style[prop] = styles[prop]);
  el.innerText = 'Optimizely is currently running an AB test';
  bod.insertBefore(el, bod.firstChild);
}

// only run on mint pages
// (prevents multiple execution caused by iframes)
if(w.location.origin.indexOf('mint') > 0)
  setTimeout(detectOptimizely, 3500);