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// browse css transition prefix
vendors = { Webkit: 'webkit', Moz: '', O: 'o' }
testEl = document.createElement('div')
$.each(vendors, function(vendor, event){
  if (testEl.style[vendor + 'TransitionProperty'] !== undefined) {
    prefix = '-' + vendor.toLowerCase() + '-'
    eventPrefix = event
    return false
  }
})