Only the upper border is displayed <table frame=above>
Only the lower border is displayed <table frame=below>
Only the left and right borders are displayed <table frame=vsides>
Only display the upper and lower borders <table frame=hsides>
Only the left border is displayed <table frame=lhs>
Only the right border is displayed <table frame=rhs>
No borders are displayed <table frame=void>
The trick to display and hide the divider of table cells is rules, and there are rules in the <TABLE> tag. It has three parameters (cols, rows, none). When rules=cols, the table hides the vertical divider, so we can only see the rows of the table; when rules=rows, the horizontal divider is hidden, so we can only see the columns of the table; when rules=none, the vertical divider and the horizontal divider will be hidden.
Remove the longitudinal divider <table rules=cols>
Remove horizontal divider <table rules=rows>
Remove vertical and horizontal dividers <table rules=none>