<!DOCTYPE html>
<style>
.grid {
  display: block;
  background-color: grey;
  overflow: scroll;
}
.inline-grid {
  display: inline-block;
  background-color: grey;
  overflow: scroll;
}
.gridItem {
  display: block;
  width: 100px;
  height: 100px;
  background: green;
}
.fit-content {
  width: -moz-fit-content;
  width: fit-content;
}
</style>
<body>
<div class='grid fit-content'>
  <span class='gridItem'></span>
</div>
<div class='grid fit-content' style='overflow-y: hidden'>
  <span class='gridItem'></span>
</div>
<div class='inline-grid fit-content'>
  <span class='gridItem'></span>
</div>
<div class='inline-grid fit-content' style='overflow-y: hidden'>
  <span class='gridItem'></span>
</div>
</body>