File: style-sharing.html

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<!doctype html>
<title>CSS Shadow Parts test: Parts don't incorrectly share style with other elements</title>
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org/" title="Mozilla">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>::part(part1) { color: green; }</style>
<div id="host"></div>
<script>
"use strict";
test(function() {
  host.attachShadow({ mode: "open" }).innerHTML = `
    <div></div>
    <div part="part1"></div>
  `;
  assert_equals(
    getComputedStyle(host.shadowRoot.querySelector("[part]")).color,
    "rgb(0, 128, 0)",
    "Part should be green",
  );
}, "Part in selected host does not incorrectly share style with non-part");
</script>