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<!DOCTYPE html>
<div style="display: flex; width: 100px; border: solid; align-items: baseline;">
<div style="width: 50px; height: 50px;">
<div style="width: 50px; height: 50px; position: relative; overflow: auto;">
<canvas width=10 height=10 style="width: 80%; background: green;"></canvas>
<div id="target" style="position: absolute; width: 10px; height: 10px; background: red; top: 100px;"></div>
</div>
</div>
<div style="width: 50px; height: 50px; background: green;"></div>
</div>