Label syntax is used to label statements (statements as the opposite to expressions).

first: for (var i = 0; i < 3; i++) {
  second: for (var j = 0; j < 3; j++) {
    if (i === 1) continue first;
    if (j === 1) break second;
    console.log(`${i} & ${j}`);
  }
}

The label syntax is quite similar to GOTO statements in older programming languages.