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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>