А что делает colspan ?

Answer 1

colspan is used to merge multiple columns together.

This link contains graphical descriptions and code samples:

https://stackoverflow.com/questions/9830506/how-do-you-use-colspan-and-rowspan-in-html-tables

Answer 2

Объединяет соседние горизонтальные ячейки.

Answer 3

Hatsy Rei you can instead also send SoloLearn link that represents what colspan is

Answer 4

Объединение столбцов