gistfile1.coffee

_is_css_blur_supported = (->
  _supported = 'dontknow'
  return ->
    return _supported unless _supported == 'dontknow'
    el = $('<div/>')
    $(document.body).append(el)
    el[0].style.webkitFilter = "grayscale(1)"
    _supported = window.getComputedStyle(el[0]).webkitFilter == "grayscale(1)"
    el.remove()
    return _supported
)()