mask-invalidation-1-ref.html

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<!DOCTYPE html>

<html>

  <head>

    <meta charset="utf-8">

    <title>CSS Masking: mask repainting.</title>

    <style type="text/css">

      div {

        background-color: purple;

        position: absolute;

        margin: 1px 2px 3px 4px;

        border: solid purple;

        width: 44px;

        height: 9px;

    </style>

  </head>

  <body>

    <div class="outer" style="top: 15px; left: 15px;"></div>

    <div class="outer" style="top: 15px; left: 115px;"></div>

    <div class="outer" style="top: 15px; left: 215px;"></div>

  </body>

</html>