#RelativeBox {
  position: relative;
  width: 300px;
  height: 200px;
  top: 0;
  left: 0;
  background: blue;
  margin: 10px auto;
}
#AbsoluteBox {
  position: absolute;
  overflow: hidden;
  width: 250px;
  height: 150px;
  background: green;
}
.ClipIt {
  clip: rect(20px, 130px, 70px, 30px);
}
#ClipBox {
  width: 200px;
  height: 200px;
  background-color: red;
}