Table with merged cells across multiple body rows (aka rowspan):

Test

Heading in center

Heading on the right

1

2

3

b

10

b

20

c

30

4

d

40

Table with merged cells across multiple body columns (aka colspan):`

Test

Heading in center

Heading on the right

1

b

10

2

b

20

3

c

30

4

d

40

Table with merged cells across multiple header columns (aka colspan):

Test

Heading in center

Heading on the right

1

b

10

2

b

20

3

c

30

4

d

40

Table with merged header cells across multiple header (question) rows (aka rowspan):

Test

Heading in center

Heading on the right

1

b

10

2

b

20

3

c

30

4

d

40