File: select-add.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>HTMLSelectElement Test: add()</title>
<link rel="author" title="Intel" href="http://www.intel.com/">
<link rel="help" href="https://html.spec.whatwg.org/multipage/form-elements.html#dom-select-add-dev">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<form style="display:none">
  <option id="testoption">
    <select id="testselect1">
    </select>
    <select id="testselect2">
      <option>TEST</option>
    </select>
  </option>
</form>

<script>

test(() => {
  let testselect1 = document.getElementById("testselect1");
  let opt1 = new Option("Marry","1");
  testselect1.add(opt1);
  assert_equals(testselect1.options[0].value, "1");
}, "test that HTMLSelectElement.add method can add option element");

test(() => {
  let testselect2 = document.getElementById("testselect2");
  let opt2 = document.getElementById("testoption");
  assert_throws_dom("HierarchyRequestError", () => {
    testselect2.add(opt2);
  });
}, "test that HierarchyRequestError exception must be thrown when element is an ancestor of the element into which it is to be inserted");

</script>