File: host-part-nesting.html

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<!doctype html>
<title>CSS Shadow Parts - :host::part() in nesting</title>
<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://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>