HTML	RESULT
[{echo 10 | gt 5}]	[1]
[{echo 'abc' | eq 'abc'}]	[1]
[{echo 7 | in (1, 7)}]	[1]
[{echo 5 | * 2 gt 9}]	[1]
{echo '' | ?? 'empty'}	empty
{echo 3 | - 1 . ' left'}	2 left