Final call for rule "Headers attribute only refers to cells in the same table"

Hi ACT Rules Community,

This is the Final Call for the new rule "*Headers attribute only refers to
cells in the same table*",
https://github.com/act-rules/act-rules.github.io/pull/412

The final call for this rule will end on September 9, 2019.
If you have any objections to the rule please raise them before this date.

We also encourage with implementations during the final call phase.

Have a good day.

Best
Jey