Allowed tags:

array(12) {
  [0]=>
  string(1) "b"
  [1]=>
  string(2) "h1"
  [2]=>
  string(2) "h2"
  [3]=>
  string(2) "h3"
  [4]=>
  string(2) "h4"
  [5]=>
  string(2) "h5"
  [6]=>
  string(1) "i"
  [7]=>
  string(1) "p"
  [8]=>
  string(6) "strong"
  [9]=>
  string(3) "sup"
  [10]=>
  string(8) "textarea"
  [11]=>
  string(1) "u"
}

No on* attributes!