<!DOCTYPE html>
<title>Reference for position: sticky should create a stacking context</title>

<style>
.indicator {
  background-color: green;
}

.box {
  width: 200px;
  height: 200px;
}
</style>

<div class="indicator box"></div>

<div>You should see a single green box above. No red or blue should be visible.</div>