<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS Masking: mask-origin: mask positioning area</title>
    <link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com">
    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
    <link rel="help" href="https://www.w3.org/TR/css-masking-1/#the-mask-origin">
    <link rel="match" href="mask-origin-2-ref.html">
    <meta name="assert" content="Test checks whether setting mask origin to margin-box works correctly or not.">
    <style type="text/css">
      div.outer {
        border: 1px solid black;
        width: 125px;
        height: 125px;
      }

      div.inner {
        /*
         * content box: 60 x 60
         * padding box: 72 x 78
         * border  box: 80 x 90
         * margin  box: 86 x 94
         */
        margin: 1px 2px 3px 4px;
        border: solid red;
        border-width: 8px 2px 4px 6px;
        padding: 6px 9px 12px 3px;
        width: 60px;
        height: 60px;
        position: relative;
        background-color: blue;
        mask-image: url(support/50x50-opaque-blue.svg);
        mask-repeat: no-repeat;
        mask-origin: margin-box;
      }

      div.overflow {
        position: absolute;
        left: -10px;
        top: -9px;
        border: solid transparent;
        border-width: 15px 13px 19px 13px;
        width: 60px;
        height: 60px;
        background-color: purple;
      }

      #pos-left-auto { mask-position: left; }
      #pos-left-bottom { mask-position: left bottom; }
      #pos-right-top { mask-position: right top; }
      #pos-right-bottom { mask-position: right bottom; }
    </style>
  </head>
  <body>
    <div class="outer">
      <div class="inner" id="pos-left-auto">
        <div class="overflow"></div>
      </div>
    </div>
    <div class="outer">
      <div class="inner" id="pos-left-bottom">
        <div class="overflow"></div>
      </div>
    </div>
    <div class="outer">
      <div class="inner" id="pos-right-top">
        <div class="overflow"></div>
      </div>
    </div>
    <div class="outer">
      <div class="inner" id="pos-right-bottom">
        <div class="overflow"></div>
      </div>
    </div>
  </body>
</html>
