If the background color of this paragraph is green (a darker green than this page's background) then this browser has this bug.
p.test {
background-color: #6f6;
}
/* \*/
p.test {
background-color: #f66;
}
/* */
As long as you escape all but the end comment tag(s) where you want to resume allowing IE/Mac to see your code, you can put comments in between where you start and stop hiding a block of CSS code from IE/Mac.