backdrop-tree-abiding-slotted.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-position/backdrop-tree-abiding-slotted.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>CSS Position Test: ::backdrop is tree abiding, allowed after ::slotted</title>

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

<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#tree-abiding">

<link rel="help" href="https://drafts.csswg.org/css-shadow/#slotted-pseudo">

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

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

<div>

  <template shadowrootmode="open">

    <style>

      ::slotted(dialog)::backdrop {

        background-color: green;

    </style>

    <slot></slot>

  </template>

  <dialog id="target"></dialog>

</div>

<script>

  const target = document.getElementById("target");

  target.showModal();

  test(() => {

    assert_equals(getComputedStyle(target, "::backdrop").backgroundColor, "rgb(0, 128, 0)");

  }, "::backdrop is tree-abiding and should be allowed after ::slotted()");

</script>