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<!DOCTYPE html>
<html>
<title>Paint positioned mask onto mask layer</title>
<style type="text/css">
#inner {
width: 200px;
height: 200px;
box-sizing:border-box;
background: blue;
/* make mask pained on mask layer */
border: 1px solid transparent;
will-change: transform;
}
#outer {
width: 200px;
height: 200px;
mask-image: url(#mymask);
/* make it fixed so that inner div has different AGR with outter div */
position: fixed;
}
</style>
<div id="outer">
<div id="inner"></div>
</div>
<svg height="0">
<defs>
<mask id="mymask" x="0" y="0" width="1" height="1">
<rect x="0" y="0" width="100" height="100" fill="white"/>
</mask>
</defs>
</svg>
</html>
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