popover-beforetoggle-opening-event.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/popovers/popover-beforetoggle-opening-event.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8" />

<title>Popover beforetoggle event</title>

<link rel="author" href="mailto:masonf@chromium.org">

<link rel=help href="https://open-ui.org/components/popover.research.explainer">

<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div popover></div>

<script>

test(() => {

  let frameCount = 0;

  requestAnimationFrame(() => {++frameCount;});

  const popover = document.querySelector('[popover]');

  const testText = 'Show Event Occurred';

  popover.addEventListener('beforetoggle',(e) => {

    assert_false(e.bubbles, 'beforetoggle event does not bubble');

    if (e.newState !== "open")

      return;

    popover.textContent = testText;

})

  popover.offsetHeight;

  assert_equals(popover.textContent,"");

  assert_equals(frameCount,0);

  popover.showPopover();

  popover.offsetHeight;

  assert_equals(popover.textContent,testText);

  assert_equals(frameCount,0,'nothing should be rendered before the popover is updated');

  popover.hidePopover(); // Cleanup

},'Ensure the `beforetoggle` event can be used to populate content before the popover renders');

</script>