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MariaDB starting with 10.2.3 The FOLLOWS other_trigger_name and PRECEDES other_trigger_name options were added in MariaDB 10.2.3 as part of supporting multiple triggers per action time.
This is the same syntax used by MySQL 5.7, although MySQL 5.7 does not have multi-trigger support.
FOLLOWS adds the new trigger after another trigger while PRECEDES adds the new trigger before another trigger. If neither option is used, the new trigger is added last for the given action and time.
FOLLOWS and PRECEDES are not stored in the trigger definition. However the trigger order is guaranteed to not change over time. mysqldump and other backup methods will not change trigger order.
You can verify the trigger order from the ACTION_ORDER column in INFORMATION_SCHEMA.TRIGGERS table.
SELECT trigger_name, action_order FROM information_schema.triggers
WHERE event_object_table='t1';
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