The Tai Tham codepoint U+1A58 TAI THAM SIGN MAI LANG KAI is challenging due to its wide range of behaviours. It can behave as a spacing final character (as in modern Tai Khün fonts) to a repha-like character, the old-fashioned behaviour seen in Tai Khün, Thailand and Laos. The MFL dictionary shows an intermediate behaviour, where marks above the following base consonant cause it to be positioned within the previous syllable. This is the style employed by the test font, which has been contributed by Richard Wordingham and whose browser test page for Tai Tham rendering gives more background.