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/*this doesn't seem to work anymore:*/

::i-block-chrome,.myClass {
  color:blue;
}

/* this one does */
/* http://seanamarasinghe.com/developer/html/safari-css-hacks/ */

_::-webkit-:not(:root:root), .safari_only {
  color:#0000FF;
  background-color:#CCCCCC;
 
}