shadow-shared-style-cache-001.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scoping/shadow-shared-style-cache-001.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Shared style invalidation with removals</title>

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1707116">

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

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

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

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

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

<div id="host-1"></div>

<div id="host-2"></div>

<script>

const INITIALLY_COMMON_STYLE = `<style>:host { background-color: red !important }</style>`;

let helper = document.querySelector("#host-1");

let host = document.querySelector("#host-2");

test(function() {

  helper.attachShadow({ mode: "open" }).innerHTML = INITIALLY_COMMON_STYLE;

  assert_equals(getComputedStyle(helper).backgroundColor, "rgb(255, 0, 0)", "Common style should apply to helper");

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

  assert_equals(getComputedStyle(host).backgroundColor, "rgb(255, 0, 0)", "Common style should apply to host");

  host.shadowRoot.innerHTML = `<style>:host { background-color: lime; width: 100px; height: 100px; }</style>`;

  assert_equals(getComputedStyle(host).backgroundColor, "rgb(0, 255, 0)", "Common style should no longer apply to host");

});

</script>