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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/contain-paint-ignored-cases-internal-table-001b.html 

<!DOCTYPE html>
<html>
  <head>
    <meta charset=utf-8>
    <title>CSS-contain test: paint containment on internal table elements except table-cell.</title>
    <link rel="author" title="Yusuf Sermet" href="mailto:[email protected]">
    <link rel="help" href="https://drafts.csswg.org/css-contain/#containment-paint">
    <link rel="match" href="contain-paint-ignored-cases-internal-table-001-ref.html">
    <meta name="assert" content="Paint containment should not apply to internal table elements except table-cell. This test testes only the tbody element, and confirms contain:paint does not create a stacking context.">
    <style>
      tbody {
        contain: paint;
        z-index: 10;
      }
      th {
        background-color: blue;
        padding-left: 50px;
      }
      caption {
        position: fixed;
        background-color: yellow;
        z-index: 2;
      }
    </style>
  </head>
  <body>
    <table>
      <caption>PASS</caption>
      <tbody>
        <tr>
          <th>&emsp;</th>
        </tr>
      </tbody>
    </table>
  </body>
</html>