an axis and the second one\n  // will use the other one\n  const useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;\n\n  // Split the offset string to obtain a list of values and operands\n  // The regex addresses values with the plus or minus sign in front (+10, -20, etc)\n  const fragments = offset.split(/(\\+|\\-)/).map(frag => frag.trim());\n\n  // Detect if the offset string contains a pair of values or a single one\n  // they could be separated by comma or space\n  const divider =...