<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://github.com/openui/open-ui/issues/547">
<link rel=help href="https://drafts.csswg.org/selectors/#open-state">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<selectmenu id=myselectmenu>
  <button id=custombutton slot=button behavior=button>button</button>
  <option>one</option>
  <option>two</option>
</selectmenu>

<script>
test(() => {
  assert_false(myselectmenu.matches(':open'),
    'Selectmenu should not match :open while it is closed.');
  assert_true(myselectmenu.matches(':closed'),
    'Selectmenu should match :closed while it is closed.');

  custombutton.click();

  assert_true(myselectmenu.matches(':open'),
    'Selectmenu should match :open while it is open.');
  assert_false(myselectmenu.matches(':closed'),
    'Selectmenu should not match :closed while it is open.');
}, 'Selectmenu should support :open and :closed pseudo selectors.');
</script>

<selectmenu id=selectmenuinvalidation>
  <button slot=button behavior=button>button</button>
  <option>one</option>
  <option>two</option>
</selectmenu>
<style>
selectmenu:closed {
  background-color: red;
}
selectmenu:open {
  background-color: green;
}
</style>

<script>
test(() => {
  const selectmenu = document.getElementById('selectmenuinvalidation');
  const button = selectmenu.querySelector('button');
  const option = selectmenu.querySelector('option');

  assert_equals(getComputedStyle(selectmenu).backgroundColor, 'rgb(255, 0, 0)',
    'The style rules from :closed should apply when the selectmenu is closed.');

  button.click();
  assert_equals(getComputedStyle(selectmenu).backgroundColor, 'rgb(0, 128, 0)',
    'The style rules from :open should apply when the selectmenu is open.');

  option.click();
  assert_equals(getComputedStyle(selectmenu).backgroundColor, 'rgb(255, 0, 0)',
    'The style rules from :closed should apply when the selectmenu is opened and closed again.');
}, 'Selectmenu :open and :closed should invalidate correctly.');
</script>
