css-scoping-shadow-dynamic-remove-style-detached.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scoping/css-scoping-shadow-dynamic-remove-style-detached.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>CSS Scoping: Invalidation of style data while ShadowRoot is disconnected.</title>

<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">

<link rel="author" title="Mozilla" href="https://mozilla.org">

<link rel="help" href="https://drafts.csswg.org/css-scoping">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1612114">

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

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

<div id="host"></div>

<script>

let t = async_test("Invalidation of style data while ShadowRoot is disconnected.");

let host = document.getElementById("host");

host.attachShadow({ mode: "open" }).innerHTML = `

  <style>

    div { color: red }

  </style>

  <div></div>

`;

assert_equals(getComputedStyle(host.shadowRoot.querySelector("div")).color, "rgb(255, 0, 0)");

host.remove();

host.shadowRoot.querySelector("style").remove();

requestAnimationFrame(t.step_func(function() {

  requestAnimationFrame(t.step_func_done(function() {

    document.body.appendChild(host);

    assert_not_equals(getComputedStyle(host.shadowRoot.querySelector("div")).color, "rgb(255, 0, 0)");

  }));

}));

</script>