<!doctype html> <title>CSS Test: Style invalidation for ::slotted()</title> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org"> <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> <link rel="help" href="https://drafts.csswg.org/css-scoping/#slotted-pseudo"> <div id="host"> <div> <span></span> <span></span> </div> <div id="slotted"> <span></span> <span></span> </div> <div> <span></span> <span></span> </div> </div> <script> test(function() { var root = host.attachShadow({"mode":"open"}); root.innerHTML = '<style>.outer ::slotted(#slotted) { background-color: red } .outer .inner::slotted(#slotted) { background-color: green }</style><div id="outer"><slot id="inner"></slot></div>'; assert_equals(window.getComputedStyle(slotted).backgroundColor, "rgba(0, 0, 0, 0)"); root.querySelector("#outer").className = "outer"; assert_equals(window.getComputedStyle(slotted).backgroundColor, "rgb(255, 0, 0)"); root.querySelector("#inner").className = "inner"; assert_equals(window.getComputedStyle(slotted).backgroundColor, "rgb(0, 128, 0)"); }) </script>