File: stacking-context.html

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<!doctype HTML>
<title>Test that the foreignObject element is a stacking context</title>
<link rel="match" href="stacking-context-ref.html">
<link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#embedded-ForeignObjectElement"/>
<style>
  * {
    margin: 0;
  }
  .el {
    width: 50px;
    height: 60px;
  }

</style>
  <!-- Test that the <foreignObject> root element is a stacking context, so z-index here
    has no effect on order w.r.t. #top, but still does for stacking under
    foreignObject -->
<svg style="width: 50px; height: 50px; overflow: visible; display: block">
  <foreignObject width=100 height=200>
    <div  class="el"
        style="position: absolute; z-index: 1; top: 40px; left: 10px; border: 1px solid black; background: lightblue"></div>
    <div  class="el"
        style="position: absolute; z-index: 2; top: 5px; left: 5px; border: 1px solid black; background: lightgreen"></div>
  </foreignObject>
</svg>
<div id=top class="el" style="position: relative; background: lightgray"></div>