Where does tag stripping take place?

Hello,

I would like to know where in the CKeditor 3.0 source the stripping of the HEIGHT attribute in a TABLE tag takes place. The attribute is stripped when entered in %, but left intact when entered in px. So there has to be a specific function that strips the attribute in a table when being in %...

I would like to know where this takes place...

Greetz,
Ludwig