Template:Diagonal split header

style="background:;background:linear-gradient(to top right, 49%,#AAA 49.5%,#AAA 50.5%, 51%);line-height:1.2;padding:0.1em 0.4em;"|

Using this template
Correct examples (start of table cell line only):

|

!

| colspan=2

! colspan=2

When adding "colspan" or "rowspan" to size the cell do not use cell separation "|" to separate them! Just a blank space will be fine.

Wrong examples:

| colspan=2 |

! colspan=2 |