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<!doctype html>
<title>CSS Shadow Parts - :host::part()</title>
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#part">
<link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1624968">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=980506">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="host"></div>
<script>
test(function() {
let host = document.getElementById("host");
host.attachShadow({ mode: "open" }).innerHTML = `
<style>
:host::part(mypart) {
color: lime;
}
:host(.tweak)::part(mypart) {
color: blue;
}
</style>
<div part="mypart"></div>
`;
let part = host.shadowRoot.querySelector("[part]");
assert_equals(
window.getComputedStyle(part).color,
"rgb(0, 255, 0)",
":host::part() works",
);
host.classList.add("tweak");
assert_equals(
window.getComputedStyle(part).color,
"rgb(0, 0, 255)",
":host::part() invalidation works properly",
);
}, ":host::part works");
</script>
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