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<!DOCTYPE html>
<html>
<head>
<style>
.group {
display: inline-block;
border: solid black 1px;
padding: 10px;
}
#container {
display: inline-block;
width: 200px;
height: 100px;
overflow-x: hidden;
overflow-y: scroll;
padding: 40px 0;
margin: auto;
scroll-snap-type: y mandatory;
}
.buffer {
scroll-snap-align: start;
background-color: lightblue;
height: 300px;
width: 200px;
}
.target {
scroll-snap-align: start;
background-color: black;
height: 10px;
width: 200px;
}
.target-zoomed {
scroll-snap-align: start;
background-color: black;
height: 20px;
width: 400px;
}
</style>
</head>
<body>
<p>The black bars should line up in each group</p>
<div class="group">
<div id="container">
<div class="buffer"></div>
<div class="target" style="scroll-margin-top: 20px;"></div>
<div class="buffer"></div>
</div>
<div id="container">
<div class="buffer"></div>
<div class="target" style="scroll-margin-top: 20px;"></div>
<div class="buffer"></div>
</div>
</div>
<div class="group">
<div id="container">
<div class="buffer"></div>
<div class="target-zoomed" style="scroll-margin-top: 40px;"></div>
<div class="buffer"></div>
</div>
<div id="container">
<div class="buffer"></div>
<div class="target-zoomed" style="scroll-margin-top: 40px;"></div>
<div class="buffer"></div>
</div>
</div>
<script>
for (match of document.querySelectorAll(".target, .target-zoomed")) {
match.scrollIntoView();
}
</script>
</body>
</html>