Can a trasaction be rolled back if a table is edited outside a transaction?

I am learning how transactions work using this short script

CREATE TABLE t_test (id INT NOT NULL PRIMARY KEY) ENGINE=InnoDB;

START TRANSACTION;

INSERT
INTO    t_test
VALUES  (1);

SELECT  *
FROM    t_test;

 id
---
  1

SAVEPOINT tran2;

INSERT
INTO    t_test
VALUES  (2);

SELECT  *
FROM    t_test;

 id
---
  1
  2

ROLLBACK TO tran2;

SELECT  *
FROM    t_test;

 id
---
  1

ROLLBACK;

SELECT  *
FROM    t_test;

 id
---

Towards the end,ROLLBACK a savepoint is used.Does it mean when ROLLBACK is used it wipes out everything that was commited earlier on?.

Secondly,what if i edit the table outside of the transaction and the try ROLLBACK TO trans2 for instance,what happens?.