<!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>