Consider re-writing with CSS grid

[emilyriederer]

CSS grid could help automatically resolve some of the outstanding problems showcased in the deck and go a long way towards simplifying the code here

[fyuniv]

To keep blank cell, adding the following codes to the css file should solve the problem.

.multicolcol {
min-height: 1px;
}

For the comma issue, it seems hard to be resolved using js. Instead, users can use the unicode character , for the comma.