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Test Info:

<!doctype html>
<title>CSS Shadow Parts - :host::part() in nesting</title>
<link rel="help" href="https://crbug.com/326526716">
<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;
}
}
</style>
<div part="mypart">This text should be green.</div>
`;
let part = host.shadowRoot.querySelector("[part]");
assert_equals(
window.getComputedStyle(part).color,
"rgb(0, 255, 0)",
":host::part() works in nesting",
);
}, ":host::part works in nesting");
</script>