.box {
  width: 3em;
  height: 3em;
  border: 1px solid black;
  background: wheat;
  margin: 1em;
  display: inline-block; }

.touch-test {
  position: relative; }

.touch-target {
  visibility: hidden;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: silver; }

.touch-test:hover .touch-target,
.touch-test:focus .touch-target {
  visibility: visible; }