<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>HTMLSelectElement.selectedOptions</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/forms.html#dom-select-selectedoptions">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="log"></div>

<select id="select-none-selected">
  <option>One</option>
  <option>Two</option>
  <option>Three</option>
</select>

<select id="select-one-selected">
  <option>One</option>
  <option selected>Two</option>
  <option>Three</option>
</select>

<select multiple id="multiple-select-none-selected">
  <option>One</option>
  <option>Two</option>
  <option>Three</option>
</select>

<select multiple id="multiple-select-two-selected">
  <option>One</option>
  <option selected>Two</option>
  <option selected>Three</option>
</select>

<select id="select-named-selected">
  <option>One</option>
  <option>Two</option>
  <option id="named-option" selected>Three</option>
</select>

<select id="invalid-select">
  <option selected>One</option>
  <option selected>Two</option>
  <option>Three</option>
</select>

<select id="select-same-object">
  <option>One</option>
  <option selected>Two</option>
  <option>Three</option>
</select>

<select multiple id="select-same-object-change">
  <option selected>One</option>
  <option selected>Two</option>
  <option selected>Three</option>
</select>

<script>
"use strict";

test(() => {
  const select = document.getElementById("select-none-selected");

  assert_array_equals(select.selectedOptions, [select.children[0]]);
  assert_equals(select.selectedOptions.length, 1);

}, ".selectedOptions with no selected option");

test(() => {
  const select = document.getElementById("select-one-selected");

  assert_array_equals(select.selectedOptions, [select.children[1]]);
  assert_equals(select.selectedOptions.length, 1);
}, ".selectedOptions with one selected option");

test(() => {
  const select = document.getElementById("multiple-select-none-selected");

  assert_equals(select.selectedOptions.item(0), null);
  assert_equals(select.selectedOptions.length, 0);
}, ".selectedOptions using the 'multiple' attribute with no selected options");

test(() => {
  const select = document.getElementById("multiple-select-two-selected");

  assert_equals(select.selectedOptions.item(0), select.children[1]);
  assert_equals(select.selectedOptions.item(1), select.children[2]);
  assert_equals(select.selectedOptions.length, 2);
}, ".selectedOptions using the 'multiple' attribute with two selected options");

// "A select element whose multiple attribute is not specified must not have
// more than one descendant option element with its selected attribute set."
// - https://html.spec.whatwg.org/multipage/forms.html#the-option-element:the-select-element-6

// "If two or more option elements in the select element's list of options
//  have their selectedness set to true, set the selectedness of all but
// the last option element with its selectedness set to true in the list of
// options in tree order to false."
// - https://html.spec.whatwg.org/multipage/forms.html#the-select-element:the-option-element-21
test(() => {
  const select = document.getElementById("invalid-select");

  assert_array_equals(select.selectedOptions, [select.children[1]]);
  assert_equals(select.selectedOptions.length, 1);

}, ".selectedOptions without the 'multiple' attribute but " +
   "more than one selected option should return the last one");

test(() => {
  const select = document.getElementById("select-named-selected");

  assert_equals(select.selectedOptions.constructor, HTMLCollection);
  assert_equals(select.selectedOptions.namedItem("named-option"), select.children[2]);
}, ".selectedOptions should return `HTMLCollection` instance");

test(() => {
  const select = document.getElementById("select-same-object");
  const selectAgain = document.getElementById("select-same-object");

  assert_equals(select.selectedOptions, selectAgain.selectedOptions);

}, ".selectedOptions should always return the same value - [SameObject]");

test(() => {
  const select = document.getElementById("select-same-object-change");
  const before = select.selectedOptions;
  assert_equals(before.length, 3);

  select.selectedOptions[1].selected = false;

  const after = select.selectedOptions;

  assert_equals(before, after);
  assert_equals(before.length, 2);
  assert_equals(after.length, 2);

}, ".selectedOptions should return the same object after selection changes - [SameObject]");
</script>
</body>
</html>