testing/web-platform/tests/css/css-tables/border-collapse-dynamic-col-001.html


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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Test: Border collapsed table with a dynamic &lt;col&gt; insertion</title>
<link rel="help" href="https://drafts.csswg.org/css-tables/#border-collapsing">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1652384">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="border-collapse-dynamic-col-001-ref.html">
<style>
  table {
    border-collapse: collapse;
    border-spacing: 0;
  }
  td {
    padding: 10px;
    border: 1px solid;
  }
</style>
<table>
  <colgroup>
    <col>
    <col>
    <col>
  </colgroup>
  <tbody>
    <tr>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td></td>
      <td></td>
      <td></td>
    </tr>
  </tbody>
</table>
<script>
  document.querySelector("table").getBoundingClientRect();
  // Insert a column at the second position.
  var trs = document.querySelectorAll("tr");
  var col = document.querySelector("col");
  col.parentNode.insertBefore(col.cloneNode(true), col.nextSibling);
  for (var i = 0; i < trs.length; ++i) {
    var row = trs[i];
    var firstCell = row.querySelector("td");
    firstCell.parentNode.insertBefore(firstCell.cloneNode(true), firstCell.nextSibling);
  }
</script>