What does 2 Chronicles 23:11 mean?

Then they brought out the king's son, put the crown on him, handed him the royal law, and made him king. Jehoiada and his sons anointed him, and everyone shouted, 'Long live the king!' 2 Chronicles 23:11 - Modern Text Bible

(Joash is crowned and given the law, symbolizing his responsibility to rule by God's standards. The people celebrate the return of a rightful king.)