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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-option-element/option-index.html 

<!DOCTYPE HTML>
<title>HTMLOptionElement.prototype.index</title>
<link rel="author" title="Domenic Denicola" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-option-index">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<select>
<option id="option0">hello</option>
<option id="option1">hello</option>
</select>


<datalist>
<option id="dl-option0">hello</option>
<option id="dl-option1">hello</option>
</datalist>

<option id="doc-option0">hello</option>
<option id="doc-option1">hello</option>

<script>
"use strict";

test(() => {

  assert_equals(document.querySelector("#option0").index, 0);
  assert_equals(document.querySelector("#option1").index, 1);

}, "option index should work inside the document");

test(() => {

  assert_equals(document.querySelector("#dl-option0").index, 0);
  assert_equals(document.querySelector("#dl-option1").index, 0);

}, "option index should always be 0 for options in datalists");

test(() => {

  assert_equals(document.querySelector("#doc-option0").index, 0);
  assert_equals(document.querySelector("#doc-option1").index, 0);

}, "option index should always be 0 for options with no container");

test(() => {

  assert_equals(document.createElement("option").index, 0);
  assert_equals(document.createElement("option").index, 0);

}, "option index should always be 0 for options not even in the document");


</script>