# OpenType Feature File specification, section 6.d, example 1:
# [GPOS LookupType 4] Mark-to-Base attachment positioning
# http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html

languagesystem DFLT dflt;

markClass [acute grave] <anchor 150 -10> @TOP_MARKS;
markClass [dieresis umlaut] <anchor 300 -10> @TOP_MARKS;
markClass [cedilla] <anchor 300 600> @BOTTOM_MARKS;

feature test {
    pos base [e o]
        <anchor 250 450> mark @TOP_MARKS
        <anchor 250 -12> mark @BOTTOM_MARKS;
#test-fea2fea: pos base [a u]
    position base [a u]
        <anchor 265 450> mark @TOP_MARKS
        <anchor 250 -10> mark @BOTTOM_MARKS;
} test;