test_user_sheet_shadow_dom.html

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<!DOCTYPE HTML>

<title>Test for bug 1576229 - Nodes in Shadow DOM react properly to dynamic changes in user sheets</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<div></div>

<span id="host" style="display: block"></span>

<script>

const gIOService = SpecialPowers.Cc["@mozilla.org/network/io-service;1"]

  .getService(SpecialPowers.Ci.nsIIOService)

const gSSService = SpecialPowers.Cc["@mozilla.org/content/style-sheet-service;1"]

  .getService(SpecialPowers.Ci.nsIStyleSheetService);

const windowUtils = SpecialPowers.getDOMWindowUtils(window);

function loadUserSheet(style) {

  const uri = gIOService.newURI("data:text/css," + style);

  windowUtils.loadSheet(uri, windowUtils.USER_SHEET);

SimpleTest.waitForExplicitFinish();

onload = function() {

  loadUserSheet(`

    div {

      width: 100px;

      height: 100px;

      background-color: red;

    .foo {

      background-color: green;

`);

  let host = document.querySelector("#host");

  host.attachShadow({ mode: "open" }).innerHTML = `

    <div></div>

`;

  let light = document.querySelector('div');

  let shadow = host.shadowRoot.querySelector('div');

  is(getComputedStyle(light).backgroundColor, "rgb(255, 0, 0)", "User sheet works in light DOM");

  is(getComputedStyle(shadow).backgroundColor, "rgb(255, 0, 0)", "User sheet works in shadow DOM");

  light.classList.add("foo");

  shadow.classList.add("foo");

  is(getComputedStyle(light).backgroundColor, "rgb(0, 128, 0)", "Dynamic change for user sheet works in light DOM");

  is(getComputedStyle(shadow).backgroundColor, "rgb(0, 128, 0)", "Dynamic change for user sheet works in shadow DOM");

  SimpleTest.finish();

</script>