runs in mkii and mkiv, but the optional argument for \HL is only valid for mkii. For mkiv it is not taken into account. \starttext \starttable[|c|c|c|c|c|c|c|c|c|c|]\HL \VL 1 \VL 2 \VL 3 \VL 4 \VL 5 \VL 6 \VL 7 \VL 8 \VL 9 \VL 10 \VL\AR\HL[5] \stoptable \stoptext Herbert