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<!DOCTYPE html>
<title>mask-position animation in delay phase</title>
<style>
  @keyframes holdMaskPosition {
    from,to { mask-position: left top; }
  }
  #test {
    height: 100px;
    width: 100px;
    mask-repeat: no-repeat;
    mask-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="25" height="25"><rect x="0" y="0" width="25" height="25" fill="blue"/></svg>');
    animation: holdMaskPosition 100s 100s infinite;
    mask-position: center center;
  }

  #inner {
    height: 100px;
    width: 100px;
    background-color: blue;
    box-sizing: border-box;
    /* Apply will-change property to force paint mask on mask layer */
    border: 1px solid transparent;
    will-change: transform;
  }
</style>
<div id="test"><div id="inner"></div></div>