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<!DOCTYPE html>
<html>
<body>
<style>
.target {
width: 100px;
height: 100px;
background-color: green;
scroll-snap-align: start;
}
.placeholder {
background-color: purple;
}
.snapcontainer {
border:solid 1px black;
overflow: scroll;
scroll-snap-type: y mandatory;
}
.big {
height: 315px;
width: 600px;
position: relative;
}
.small {
height: 115px;
width: 120px;
}
.positioned {
position: absolute;
}
#target1, #target2, #target3, #target4, #target5 {
top: 400px;
}
#target1 {
left: 0px;
}
#target2 {
left: 110px;
}
#target3 {
left: 220px;
}
#target4 {
left: 330px;
}
#target5 {
left: 440px;
}
:target {
background-color: yellow;
}
.large-space {
position: absolute;
height: 300vh;
width: 300vw;
}
</style>
<div id="outer" class="big snapcontainer">
<div id="outerplaceholder1" class="placeholder target"></div>
<div id="outerplaceholder2" class="placeholder target"></div>
<div id="inner" class="small snapcontainer">
<div id="innerplaceholder1" class="placeholder target"></div>
<div id="innerplaceholder2" class="placeholder target"></div>
<div id="target1" class="positioned target"><h1>Box 1</h1></div>
<div id="target2" class="positioned target"><h1>Box 2</h1></div>
<div id="target3" class="positioned target"><h1>Box 3</h1></div>
<div id="target4" class="positioned target"><h1>Box 4</h1></div>
<div id="target5" class="positioned target"><h1>Box 5</h1></div>
</div>
<div class="large-space"></div>
</div>
</body>
</html>