Align

An empty initial cell

a c
a b c
a b c

Missing alignment characters

| a | b | c | | |---|---| | d | e | f |

| a | b | c | |---|---| | | d | e | f |

Incorrect characters

| a | b | c | |---|-*-|---| | d | e | f |

Two alignments

|a| |::|

a

Two at the start or end

|a| |::-|

|a| |-::|

In the middle

|a| |-:-|

A space in the middle

|a| |- -|

No pipe

a
a
a

A single colon

|a| |:|

a :

Alignment on empty cells

a b c d e
f