What is colspan

Answer 1

The colspan attribute defines the number of columns a table cell should span.
more details
https://www.w3schools.com/tags/att_colspan.asp
http://html.com/attributes/td-colspan/

Answer 2

simple table with 2 rows and 2 columns

|”””””””””””"”""”|”””””””””””””|
|““““““““““““"""“|“““““““““““““|
|<-colspan->|