shadow-host-removal-invalidation.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scoping/shadow-host-removal-invalidation.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>CSS Test: Invalidation of :host selectors</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/#host-selector">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1499603">

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

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

<div id="host" style="color: green"></div>

<script>

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

  <style>

    :host { color: red !important }

  </style>

`;

test(function() {

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

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

  assert_equals(getComputedStyle(host).color, "rgb(0, 128, 0)");

}, ":host rules are properly invalidated when stylesheets are removed");

</script>