root-element-creates-stacking-context.html

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<html style="width: 0; height: 0; border: 50px solid red">

  <link rel="help" href="https://drafts.csswg.org/css2/#stacking-context">

  <link rel="match" href="root-element-creates-stacking-context-ref.html">

  <link rel="author" title="Michael Rees" href="mailto:mrees@noeontheend.com">

  <meta name="assert" content="root element forms the root stacking context">

  <body style="border: 50px solid green; margin: -50px; position: relative; z-index: -1">

  </body>

</html>