What is the difference between box-sizing: content-box and box-sizing: border-box code example

Example 1: difference bw box and border box

.alligator-box {
  box-sizing: border-box;
  width: 125px;
  height: 125px;
  border-width: 10px;
  padding: 40px;
}

Example 2: difference bw box and border box

.alligator-box {
  box-sizing: content-box;
  width: 125px;
  height: 125px;
  border-width: 10px;
  padding: 40px;
}