chromium/third_party/blink/web_tests/fast/scroll-snap/resources/simple-snap.css

body {
  margin: 0px;
}
#scroller {
  position: absolute;
  width: 400px;
  height: 400px;
  overflow: scroll;
  scroll-snap-type: both mandatory;
  padding: 0px;
}
.snap {
  position: absolute;
  width: 200px;
  height: 200px;
  background-color: blue;
  scroll-snap-align: start;
}
#space {
  position: absolute;
  width: 1000px;
  height: 1000px;
}
.left {
  left: 0px;
}
.top {
  top: 0px;
}
.right {
  left: 400px;
}
.bottom {
  top: 400px;
}