((i+j)%2==0 ? "light-square-diag" : "dark-square-diag") + "'>";
if (markArray.length>0 && markArray[i][j])
boardDiv += "<img src='/images/mark.svg' class='markSquare'/>";
((i+j)%2==0 ? "light-square-diag" : "dark-square-diag") + "'>";
if (markArray.length>0 && markArray[i][j])
boardDiv += "<img src='/images/mark.svg' class='markSquare'/>";