overlay-transition.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-position/overlay/overlay-transition.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>CSS Positioned Layout Module Test: 'overlay' is transitioned in and out of 'auto'</title>

<link rel="help" href="https://drafts.csswg.org/css-position-4/#overlay">

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

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

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

<style>

  #transition-in, #transition-out {

    /* Force display:block both popover open or closed to not rely on

       @starting-style or display transitions. */

    display: block;

  .enable-transitions :is(#transition-in, #transition-out) {

    transition: overlay 60s step-end;

    transition-behavior: allow-discrete;

</style>

<div id="container">

  <div id="transition-in" popover></div>

  <div id="transition-out" popover></div>

</div>

<script>

  let transition_in = document.querySelector("#transition-in");

  let transition_out = document.querySelector("#transition-out");

  test(() => {

    transition_out.showPopover();

    assert_equals(getComputedStyle(transition_in).overlay, "none");

    assert_equals(getComputedStyle(transition_out).overlay, "auto");

  }, "Open the popover to be closed and verify computed overlay for both popovers");

  container.className = "enable-transitions";

  test(() => {

    assert_true(transition_out.matches(':popover-open'));

    assert_false(transition_in.matches(':popover-open'));

    transition_in.showPopover();

    assert_true(transition_in.matches(':popover-open'));

    assert_false(transition_out.matches(':popover-open'));

    assert_equals(getComputedStyle(transition_in).overlay, "none",

       'Transition in should be delayed');

    assert_equals(getComputedStyle(transition_out).overlay, "auto",

       'Transition out should be delayed');

  }, "Transition overlays");

</script>