<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title><!-- Shadow Parts issue with xul/xbl domparser --></title>
  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
  <style>custom-button::part(foo) { background: red; }</style>
  <script>
    add_task(async function test() {
      // A simplified version of what MozXULElement.parseXULToFragment does
      let parser = new DOMParser();
      parser.forceEnableXULXBL();
      let doc = parser.parseFromString(`<box xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"><box part="foo">there</box></box>`, `application/xml`);
      let range = doc.createRange();
      range.selectNodeContents(doc.querySelector("box"));
      let frag = range.extractContents();

      customElements.define("custom-button", class extends HTMLElement {
        constructor() {
          super();
          this.attachShadow({mode: "open"});
          this.shadowRoot.appendChild(document.importNode(frag, true));
        }
      });
      let button = document.createElement("custom-button");
      document.body.appendChild(button);

      let box = button.shadowRoot.querySelector("box");

      // XXX: this fixes it
      // box.removeAttribute("part");
      // box.setAttribute("part", "foo");

      is(window.getComputedStyle(box).getPropertyValue("background-color"), "rgb(255, 0, 0)", "part applied");
    });
  </script>
</head>
<body>
<p id="display"></p>
<div id="content" style="display: none"></div>
<pre id="test"></pre>
</body>
</html>
