fonttools/Tests/feaLib/data/GPOS_6.fea

languagesystem DFLT dflt;

markClass [acute grave] <anchor 1 1 contourpoint 11> @TOP_MARKS;
markClass macron <anchor 2 2 contourpoint 22> @TOP_MARKS;
markClass [cedilla] <anchor 3 3 contourpoint 33> @BOTTOM_MARKS;

feature test {
    pos mark [acute grave macron ogonek]
        <anchor 500 200> mark @TOP_MARKS
        <anchor 500 -80> mark @BOTTOM_MARKS;
    pos mark [dieresis caron]
        <anchor 500 200> mark @TOP_MARKS;
} test;