html-table-section-element.js

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// https://html.spec.whatwg.org/multipage/#dom-tbody-rows

function testRowsAttribute(localName) {

  var elem = document.createElement(localName);

  assert_equals(elem.rows.length, 0);

  // Child <p> should *not* count as a row

  elem.appendChild(document.createElement("p"));

  assert_equals(elem.rows.length, 0);

  // Child <tr> should count as a row

  var childTr = document.createElement("tr");

  elem.appendChild(childTr);

  assert_equals(elem.rows.length, 1);

  // Nested table with child <tr> should *not* count as a row

  var nested = document.createElement(localName);

  nested.appendChild(document.createElement("tr"));

  var nestedTable = document.createElement("table");

  nestedTable.appendChild(nested);

  childTr.appendChild(nestedTable);

  assert_equals(elem.rows.length, 1);