Filter unknow CSS properties which become not-unknown with a vendor prefix

[wheany]

If I have a CSS block such as:

div
 {
 -moz-transition-property: width;
 -webkit-transition-property:width;
 -o-transition-property:width;
 transition-property:width;
 }

The error console shows the following error (with vendor-prefix filtering on):

transition-property is an unknown property
    transition-property: width;
  ----------------------^

Add option to filter CSS properties which become known properties when prepended with -o-.