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<!DOCTYPE html>
<html reftest-async-scroll>
<style>
.container {
position: absolute;
left: 0;
top: 0;
}
.scroller {
position: absolute;
overflow: auto;
scrollbar-width: none;
width: 150px;
height: 100px;
}
.spacer {
width: 1px;
height: 500px;
}
.anchor1 {
width: 50px;
height: 50px;
background: blue;
anchor-name: --my-anchor1;
position: absolute;
position-anchor: --my-anchor2;
position-visibility: always;
left: anchor(right);
top: anchor(bottom);
}
.anchor2 {
width: 50px;
height: 50px;
background: pink;
anchor-name: --my-anchor2;
position: absolute;
position-anchor: --my-anchor3;
position-visibility: always;
left: anchor(right);
top: anchor(bottom);
}
.anchored {
position: absolute;
position-anchor: --my-anchor1;
position-visibility: always;
width: 50px;
height: 50px;
background: yellow;
left: anchor(right);
top: anchor(bottom);
anchor-name: --my-anchor3;
}
</style>
<div class="container">
<div class="scroller"
reftest-displayport-x="0" reftest-displayport-y="0"
reftest-displayport-w="150" reftest-displayport-h="500">
<div class="scroller"
reftest-displayport-x="0" reftest-displayport-y="0"
reftest-displayport-w="150" reftest-displayport-h="500"
reftest-async-scroll-y="50">
<div class="anchor2"></div>
<div class="spacer"></div>
</div>
<div class="anchor1"></div>
<div class="spacer"></div>
</div>
<div class="anchored"></div>
</div>
</html>
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