<!doctype html>
<title>CSS Overflow Reference: scrollbar-gutter is accounted for in abspos sizing</title>
<style>
.container {
scrollbar-gutter: stable;
overflow-y: auto;
width: 100px;
height: 200px;
position: relative;
}
.child {
width: 100%;
height: 100px;
background: green;
}
</style>
<div class="container">
<div class="child"></div>
</div>