test_bug1931559.html

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<!DOCTYPE HTML>

<title>Test for bug 1931559</title>

<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">

<div id="dut" class="foo"></div>

<script>

SimpleTest.waitForExplicitFinish();

addEventListener("DOMContentLoaded", () => {

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

    .getService(Ci.nsIStyleSheetService);

  const utils = window.windowUtils;

  const userUrl = encodeURI("data:text/css,body { @scope { .foo { color: green; } } }");

  utils.loadSheetUsingURIString(userUrl, sss.USER_SHEET);

  const s = getComputedStyle(dut);

  is(s.color, "rgb(0, 128, 0)", ".foo has implicitly scoped style applied.");

  SimpleTest.finish();

});

</script>