Indic Positional Category - Top And Bottom

Top And Bottom is a value that describes how certain characters, primarily vowel signs in Indic scripts, are positioned relative to the base consonant. It specifically indicates that the mark appears either above the consonant (as a top attachment) or below it (as a bottom attachment), often depending on the surrounding characters or the specific script’s conventions. This value helps in shaping and rendering text correctly, ensuring that diacritics like matras are placed in their proper vertical slot for legible and accurate display, especially when combining with consonant clusters or other marks.